Poul Erik Hansen
#159,952
Most Influential Person Now
Researcher
Poul Erik Hansen's AcademicInfluence.com Rankings
Poul Erik Hansencomputer-science Degrees
Computer Science
#9095
World Rank
#9557
Historical Rank
Machine Learning
#3898
World Rank
#3945
Historical Rank
Artificial Intelligence
#4230
World Rank
#4289
Historical Rank
Database
#6088
World Rank
#6313
Historical Rank
Download Badge
Computer Science
Poul Erik Hansen's Degrees
- PhD Computer Science University of Copenhagen
- Masters Computer Science Aarhus University
- Bachelors Computer Science University of Southern Denmark
Similar Degrees You Can Earn
Why Is Poul Erik Hansen Influential?
(Suggest an Edit or Addition)Poul Erik Hansen's Published Works
Number of citations in a given year to any of this author's works
Total number of citations to an author for the works they published in a given year. This highlights publication of the most important work(s) by the author
Published Works
- Carbon—hydrogen spin—spin coupling constants (1981) (275)
- Isotope effects in nuclear shielding (1988) (224)
- Bromophenols in Marine Algae and Their Bioactivities (2011) (195)
- Pharmacological Profile of Xanthohumol, a Prenylated Flavonoid from Hops (Humulus lupulus) (2015) (151)
- Isolation, Characterization, and Quantitative Analysis of Microviridin J, a New Microcystis Metabolite Toxic to Daphnia (2003) (140)
- 13C NMR of polycyclic aromatic compounds. A review (1979) (139)
- Solution structure of the eukaryotic pore-forming cytolysin equinatoxin II: implications for pore formation. (2002) (134)
- The influence of organic matter on sorption and fate of glyphosate in soil--comparing different soils and humic substances. (2009) (109)
- Magnetic susceptibility: solutions, emulsions, and cells (2003) (92)
- Long range 13C1H spin-spin coupling constants in amino acids. Conformational applications (1975) (77)
- NMR and IR Investigations of Strong Intramolecular Hydrogen Bonds (2017) (70)
- Sorption of Polycyclic Aromatic Compounds to Humic Acid As Studied by High-Performance Liquid Chromatography (1997) (66)
- Characterisation of humic materials of different origin: a multivariate approach for quantifying the latent properties of dissolved organic matter. (2002) (64)
- Phosphate pool dynamics in the arbuscular mycorrhizal fungus Glomus intraradices studied by in vivo31 P NMR spectroscopy. (2004) (64)
- Isotope Effects on Chemical Shifts as an Analytical Tool in Structural Studies of Intramolecular Hydrogen Bonded Compounds (2000) (64)
- Deuterium isotope effects on 13C chemical shifts of intramolecularly hydrogen-bonded Schiff bases (1999) (63)
- Unraveling the Electronic and Vibrational Contributions to Deuterium Isotope Effects on 13C Chemical Shifts Using ab Initio Model Calculations. Analysis of the Observed Isotope Effects on Sterically Perturbed Intramolecular Hydrogen-Bonded o-Hydroxy Acyl Aromatics (1998) (62)
- Deuterium isotope effects on the 13C nuclear shielding of intramolecularly hydrogen‐bonded systems (1986) (61)
- NMR study of proton transfer equilibrium in Schiff bases derived from 2‐hydroxy‐1‐naphthaldehyde and 1‐hydroxy‐2‐acetonaphthone. Deuterium isotope effects on 13C and 15N chemical shifts (2001) (59)
- Deuterium‐Induced Isotope Effects on 13C Chemical Shifts as a Probe for Tautomerism in Enolic β‐Diketones (1996) (58)
- Characterization of salt bridges to lysines in the protein G B1 domain. (2009) (58)
- Long range 13C13C coupling constants. A review (1978) (52)
- Characterization and structural modelling of humic substances in field soil displaying significant differences from previously proposed structures (2008) (51)
- Substituent effects on deuterium isotope effects on nuclear shielding of intramolecularly hydrogen‐bonded aromatic ketones, aldehydes and esters (1993) (50)
- 31P NMR for the study of P metabolism and translocation in arbuscular mycorrhizal fungi (2000) (49)
- Isotope effects on chemical shifts of proteins and peptides (2000) (47)
- Studies Based on Deuterium Isotope Effect on 13C Chemical Shifts (2004) (46)
- Deuterium and 18O isotope effects on 13C chemical shifts of sterically hindered and/or intramolecularly hydrogen‐bonded o‐hydroxy acyl aromatics (1994) (44)
- Deuterium isotope effects on 13C nuclear shielding as a measure of tautomeric equilibria (1982) (41)
- Deuterium Isotope Effects on 13C and 15N Nuclear Shielding in Intramolecularly Hydrogen-Bonded Compounds. Investigation of Enamine Derivatives. (1990) (40)
- NMR structure determination of a modified DNA oligonucleotide containing a new intercalating nucleic acid. (2004) (38)
- Tautomerism of sterically hindered schiff bases. Deuterium isotope effects on 13C chemical shifts. (2005) (38)
- Solvent-induced deuterium isotope effects on 19F chemical shifts of some substituted fluorobenzenes. Formation of inclusion complexes (1985) (36)
- 13C, 13C coupling constants and 13C chemical shifts of aromatic carbonyl compounds. Effects of ortho‐ and peri‐interactions involving the carbonyl substituent (1977) (36)
- A 19F NMR study of C–I⋯π halogen bonding (2011) (36)
- Photovoltaic Performance and Characteristics of Dye-Sensitized Solar Cells Prepared with the N719 Thermal Degradation Products [Ru(LH)2(NCS)(4-tert-butylpyridine)][N(Bu)4] and [Ru(LH)2(NCS)(1-methylbenzimidazole)][N(Bu)4] (2011) (36)
- One-bond deuterium isotope effects on 15N chemical shifts in Schiff bases (1998) (35)
- Deuterium isotope effects on 13C nuclear shielding of amino and acetamido compounds. Tautomerism and intramolecular hydrogen bonding (1992) (35)
- Carbon–proton coupling constants in allenes, ethenes and butatrienes. Application to conformational analysis of allenyl and vinyl alkyl ethers and thioethers (1984) (34)
- Tautomerism of enolic triacetylmethane, 2‐acyl‐1,3‐cycloalkanediones, 5‐acyl Meldrum’s acids and 5‐acyl‐1,3‐dimethylbarbituric acids studied by means of deuterium isotope effects on 13C chemical shifts (1998) (34)
- Exploring Symbiotic Nitrogen Fixation and Assimilation in Pea Root Nodules by in Vivo 15N Nuclear Magnetic Resonance Spectroscopy and Liquid Chromatography-Mass Spectrometry1 (2003) (34)
- Further insight via 15N NMR spectroscopy into the reactive intermediates formed by superacid protonation of crowded nitro- PAHs: persistent dihydroxyiminiumpyrenium and hydroxyiminiumpyrenium dications (1998) (34)
- Hydrogen bonding and tautomerism studied by isotope effects on chemical shifts (1994) (33)
- Schiff bases of gossypol: an NMR and DFT study (2005) (33)
- Strong intramolecular hydrogen bonding involving nitro- and acetyl groups: Deuterium Isotope effects on chemical shifts (2006) (33)
- Steric compression and twist in o-hydroxy acyl aromatics with intramolecular hydrogen bonding (2005) (32)
- Effect of different humic substances on the fate of diuron and its main metabolite 3,4-dichloroaniline in soil. (2008) (31)
- Isotope Effects on Nuclear Shielding (1984) (31)
- NMR Studies of Hydroxy Schiff Bases (2009) (31)
- Variable temperature 1H and 13C NMR spectroscopic investigation of the enol–enethiol tautomerism of β-thioxoketones. Isotope effects due to deuteron chelation (2000) (31)
- New erythritol derivatives from the fertile form of Roccella montagnei. (2017) (31)
- 13C13C coupling constants in derivatives of trans‐stilbene and tetraphenylethylene. Determination of relative signs II (1976) (30)
- Deuterium isotope effects on nuclear shielding: directional effects and nonadditivity in acyl derivatives (1986) (30)
- An efficient and green method for regio- and chemo-selective Friedel–Crafts acylations using a deep eutectic solvent ([CholineCl][ZnCl2]3) (2016) (30)
- Deuterium isotope effects on 13C and 15N nuclear shielding in o‐hydroxyazo dyes (1984) (29)
- 13C19F spin–spin coupling in some monofluoro-substituted polycyclic aromatic hydrocarbons† (1977) (29)
- Tautomeric transformations of piroxicam in solution: a combined experimental and theoretical study (2015) (28)
- Carbon–Carbon Coupling Constants: Data (1981) (28)
- OH stretching frequencies in systems with intramolecular hydrogen bonds: Harmonic and anharmonic analyses (2011) (28)
- 13C, 13C coupling constants in phenyl substituted ethylene, naphthalene, phenanthrene and cyclopentadienone. Dependence on dihedral angles. Determination of signs by the symmetrical double labelling (SDL) method. IV (1979) (28)
- Isotope effect on chemical shifts in hydrogen-bonded systems (2007) (27)
- Sorption of polycyclic aromatic compounds to humic and fulvic acid HPLC column materials. (2001) (27)
- Ab initio calculations of deuterium isotope effects on hydrogen and nitrogen nuclear magnetic shielding in the hydrated ammonium ion (1992) (27)
- Determination of relative signs of 13C13C coupling constants in doubly labelled compounds (1975) (26)
- Variable‐temperature NMR studies of 2,6‐dihydroxy acylaromatic compounds. Deuterium isotope effects on chemical shifts, isotopic perturbation of equilibrium and barriers to rotation (1993) (26)
- CH, CD, CC and HH coupling constants in isotopically enriched cyclobutene (1981) (26)
- The intramolecular hydrogen bond in ortho -hydroxy acetophenones (2004) (26)
- Density functional theory study of intramolecular hydrogen bonding and proton transfer in o-hydroxyaryl ketimines. (2008) (25)
- Cytotoxic geranylated xanthones and O-alkylated derivatives of α-mangostin. (2009) (25)
- Substituent effects on 13C13C coupling constants and chemical shifts in 13C labelled polycyclic aromatic hydroxy compounds (1975) (25)
- Binding of topotecan to a nicked DNA oligomer in solution. (2008) (25)
- Deuterium Isotope Effects on 13C Chemical Shifts of o‐Hydroxyacyl Aromatics. Intramolecular Hydrogen Bonding (1997) (24)
- Intramolecular hydrogen bonding of the enol forms of beta-ketoamides and beta-ketothioamides: deuterium isotope effects on 13C chemical shifts (1996) (24)
- 13C13C coupling constants and substituent effects on 13C chemical shifts in 13C labelled pyrene and pyrene derivatives (1975) (24)
- Determination of octanol-water partition coefficients of polar polycyclic aromatic compounds (N-PAC) by high performance liquid chromatography (1997) (24)
- A Simple Synthetic Route to Silylated Methyl 3-Azido-2,3-dideoxy-alpha,beta-D-erythro-pentofuranoside. (1990) (24)
- Isotope Effects on Chemical Shifts in the Study of Intramolecular Hydrogen Bonds (2015) (23)
- Individualization of treatments with drugs metabolized by CES1: combining genetics and metabolomics. (2015) (23)
- Deuterium isotope effects on 15N backbone chemical shifts in proteins (2009) (23)
- Primary tritium and deuterium isotope effects on chemical shifts of compounds having an intramolecular hydrogen bond † (2000) (23)
- Reverse quantitative structure-activity relationship for modelling the sorption of esfenvalerate to dissolved organic matter. A multivariate approach. (2002) (22)
- Charge Delocalization Pathways in Persistent 1-Pyrenyl-, 4-Pyrenyl-, and 2-Pyrenylmethylcarbenium Ions as Models of PAH−Epoxide Ring Opening: NMR Studies in Superacids and AM1 Calculations§ (1997) (22)
- Friedolanostane, friedocycloartane and benzophenone constituents of the bark and leaves of Garcinia benthami. (2011) (22)
- Temperature coefficient of NH chemical shifts of thioamides and amides in relation to structure (2004) (22)
- Deuterium isotope effects on 13C chemical shifts of intramolecularly hydrogen‐bonded olefins (1995) (22)
- DEUTERIUM ISOTOPE EFFECTS ON 13C CHEMICAL SHIFTS OF ENAMINONES (1997) (21)
- Theoretical, Structural, Vibrational, NMR, and Thermal Evidence of the Inter- versus Intramolecular Hydrogen Bonding in Oxamides and Thiooxamides (2004) (21)
- Deuterium isotope effects on 15N, 13C and 1H chemical shifts of proton sponges (2002) (21)
- Multiple binding modes of the camptothecin family to DNA oligomers. (2004) (21)
- LONG-RANGE INTRINSIC AND EQUILIBRIUM DEUTERIUM ISOTOPE EFFECTS ON 19F CHEMICAL SHIFTS (1997) (21)
- Solution and solid state 13C NMR and X-ray studies of genistein complexes with amines. Potential biological function of the C-7, C-5, and C-4′-OH groups (2003) (20)
- 4-Hydroxy-1-naphthaldehydes: proton transfer or deprotonation. (2015) (20)
- On prediction of OH stretching frequencies in intramolecularly hydrogen bonded systems (2012) (20)
- Thioacetylacetone: structural and vibrational assignments. (2004) (20)
- Variable‐temperature NMR study of the enol forms of benzoylacetones (2005) (20)
- Trichloromethyl compounds--natural background concentrations and fates within and below coniferous forests. (2010) (20)
- Detection of salt bridges to lysines in solution in barnase. (2013) (19)
- Ab initio calculations of deuterium isotope effects on chemical shifts of salt-bridged lysines. (2011) (19)
- An efficient and green synthesis of 1-indanone and 1-tetralone via intramolecular Friedel-Crafts acylation reaction (2015) (19)
- Intramolecular hydrogen bonding and tautomerism of acylpyran-2,4-diones, -2,4,6-triones and acylpyridinediones and benzannelated derivatives. Deuterium isotope effects on 13C NMR chemical shifts (1995) (19)
- A nicked duplex decamer DNA with a PEG(6) tether. (2001) (19)
- nJ(13C, O1H) coupling constants of intramolecularly hydrogen‐bonded compounds (1998) (19)
- Theoretical and NMR studies of deuterium isotopic perturbation of hydrogen bonding in symmetrical dihydroxy compounds. (2010) (19)
- Indium triflate in 1-isobutyl-3-methylimidazolium dihydrogen phosphate: an efficient and green catalytic system for Friedel–Crafts acylation (2015) (19)
- Dynamics of excited state proton transfer in nitro substituted 10-hydroxybenzo[h]quinolines. (2017) (19)
- Characterisation of the PT-form of o-hydroxy acylaromatic Schiff bases by NMR spectroscopy and DFT calculations (2004) (19)
- Chemical constituents from Sonneratia ovata Backer and their in vitro cytotoxicity and acetylcholinesterase inhibitory activities. (2015) (18)
- Intramolecular hydrogen bonding of novel o‐hydroxythioacetophenones and related compounds evaluated by deuterium isotope effects on 13C chemical shifts (2007) (18)
- Bioactivities and chemical constituents of a Vietnamese medicinal plant Che Vang, Jasminum subtriplinerve Blume (Oleaceae) (2008) (18)
- Carbon–Carbon Coupling Constants: Discussion (1981) (17)
- Preparation and structural characterization of a new class of stable thioketones: ortho-hydroxythioacetophenones (2006) (17)
- Erbium trifluoromethanesulfonate-catalyzed Friedel–Crafts acylation using aromatic carboxylic acids as acylating agents under monomode-microwave irradiation (2015) (17)
- Use of 13C-1H spin-coupling constants in the determination of side-chain conformations of amino-acids (1974) (17)
- Deuterium isotope effects on 17 O chemical shifts of intramolecularly hydrogen bonded systems (1999) (17)
- Generation and NMR studies of persistent fluoro(alkyl)pyrenium ions and their tetrahydro and hexahydro derivatives in superacid media (1993) (16)
- Long-range deuterium isotope effects on (13)C chemical shifts of intramolecularly hydrogen-bonded N-substituted 3-(cycloamine)thiopropionamides or amides: a case of electric field effects. (2007) (16)
- 10-Hydroxybenzo[ h ]quinoline: switching between single- and double-well proton transfer through structural modifications (2015) (16)
- Conformational and tautomeric eccentricities of 2‐acetyl‐1,8‐dihydroxynaphthalenes (2007) (16)
- A concept for stimulated proton transfer in 1-(phenyldiazenyl)naphthalen-2-ols (2018) (16)
- Isotope effects on chemical shifts as a tool in structural studies (1996) (16)
- Deuterium isotope effects on 14N and 15N nuclear shielding in simple nitrogen‐containing compounds (1985) (15)
- A spectrochemometric approach to tautomerism and hydrogen-bonding in 3-acyltetronic acids (2006) (15)
- A Reinvestigation of One-Bond Deuterium Isotope Effects on Nitrogen and on Proton Nuclear Shielding for the Ammonium Ion. (1989) (15)
- Protonation and sulfinylation of isomeric isopropylpyrenes, 2,7-di-tert-butylpyrene, and tetracyclohexyl- and tetracyclopentylpyrenes: remarkably stable, sterically crowded pyrenium cations (1991) (15)
- The structure of the phototransformation product of monothiodibenzoylmethane (2001) (15)
- Stable Ion Studies of the Chrysene Skeleton. Protonation of Chrysene, 6-Halochrysenes, 6-Acetylchrysene, and 4H-Cyclopenta[def]chrysene: NMR Studies of Charge Distribution in Chrysenium Cations and AM1 Calculations (1997) (15)
- Cathodic t-Butylation of Pyrene. (1976) (15)
- Polycyclic aromatic hydrocarbon solute probes Part XII: Dissimilar fluorescence excitation/emission behavior between alkylpyrene and alkylcoronene derivatives and the parent pah molecule (1996) (15)
- Intramolecular hydrogen bonding in 8-quinolinol N-oxides, quinaldinic acid N-oxides and quinoline-2-carboxyamide N-oxide. Deuterium isotope effects on 13C chemical shifts (1997) (15)
- Long‐range deuterium isotope effects on 13C chemical shifts of intramolecularly hydrogen‐bonded compounds. Purpurogallins (1993) (14)
- Carbon–carbon coupling constants of 1‐phenylazo‐2‐naphthol and 2‐phenylazo‐1‐naphthol obtained by the SEMINA‐1 technique (1986) (14)
- Assignment of the ligating nitrogen in o,o'-dihydroxyazoarene complexes of nickel-, palladium-, and platinum(II) by 1H and 13C NMR spectroscopy (1994) (14)
- Structural studies on Mannich bases of 2-Hydroxy-3,4,5,6-tetrachlorobenzene. An UV, IR, NMR and DFT study. A mini-review (2016) (14)
- 13C, 13C coupling constants in anthracene, 9,10‐dihydroanthracene and phthalic acid derivatives. Determination of signs by the symmetrical double labelling (SDL) method V (1979) (14)
- 13CC13 coupling constants in dimethyl phthalate and phthalic anhydride. Determination of signs—III (1976) (14)
- A Simple, Effective, Green Method for the Regioselective 3-Acylation of Unprotected Indoles (2015) (14)
- Substituent Conformational effects in vicinal13C?13C spin-spin coupling constants (1979) (14)
- A new chromanone acid from the bark of Calophyllum dryobalanoides (2012) (14)
- NMR of a series of novel hydroxyflavothiones (2009) (14)
- A New Flavone Glycoside From Lumnitzera littorea with In Vitro α-Glucosidase Inhibitory Activity (2019) (14)
- Stable ion study of regioisomeric carboxonium-substituted pyrenium ions: directive effects, charge delocalization mode, and conformational aspects. (2000) (13)
- Long‐range deuterium isotope effects in tautomeric β‐thioxoketones. A 1H and 13C NMR study (1991) (13)
- Ultrasound assisted synthesis of 5,9-dimethylpentadecane and 5,9-dimethylhexadecane--the sex pheromones of Leucoptera coffeella. (2007) (13)
- Deuterium Isotope Effects on 13C-NMR Chemical Shifts of 10-Hydroxybenzo[h]quinolines (2013) (13)
- Automerization of pyrene a test for the mechanism of naphthalene automerization (1982) (13)
- The effect of 4-tert-butylpyridine and Li+ on the thermal degradation of TiO2 – bound ruthenium dye N719 (2012) (13)
- Factor analysis of deuterium isotope effects on 13C NMR chemical shifts in Schiff bases. (2005) (13)
- Oxidation of sterically crowded alkyl(cycloalkyl)pyrenes. Persistent dications in SbF5/SO2ClF and radical cations in FSO3H/SO2 (1993) (13)
- Infrared Spectra of Pyrene Derivatives. Relation to the Substitution Pattern. (1981) (13)
- 2DeltaH(D) and 1DeltaN(D) Isotope Effects on Nuclear Shielding of Ammonium Ions in Complexes with Crown Ethers and Cryptands. (1993) (12)
- The possible tautomerism of the potential rotary switch 2-(2-(2-Hydroxy-4-nitrophenyl)hydrazono)-1-phenylbutane-1,3-dione (2017) (12)
- Sixteen 13C-19F Spin-Spin Coupling Constants in the 13C NMR Spectrum of 1-Fluoropyrene (C16H9F). (1972) (12)
- Methodological problems in determining TCAA in soils-the discovery of novel natural trichloroacetyl containing compounds and their interference with a common method for determining TCAA in soil and vegetation. (2010) (12)
- Searching Conformational Space in Flexible Molecules Using NOEs and Molecular Modeling (1995) (11)
- Computational Prediction of 1 H and 13 C NMR Chemical Shifts for Protonated Alkylpyrroles: Electron Correlation and Not Solvation is the Salvation. (2018) (11)
- Dye-sensitized solar cells and complexes between pyridines and iodines. A NMR, IR and DFT study. (2012) (11)
- Ring current and anisotropy effects on OH chemical shifts in resonance-assisted intramolecular H-bonds (2018) (11)
- The application of high‐performance liquid chromatography humic acid columns in determination of Koc of polycyclic aromatic compounds (2003) (11)
- Reactivity and diastereoselectivity of Michael additions of amines to achiral α,β-unsaturated thioamides (2001) (11)
- 17O chemical shifts and deuterium isotope effects on 13C chemical shifts of intramolecularly hydrogen‐bonded compounds (1998) (11)
- Isotopic Perturbation of Equilibrium in 2,6-Dihydroxybenzoyl Compounds. A 13C and 1 H NMR Investigation. (1988) (10)
- Molecular structure and intramolecular hydrogen bond strength of 3-methyl-4-amino-3-penten-2-one and its N Me and N-Ph substitutions by experimental and theoretical methods (2019) (10)
- Intramolecular Hydrogen Bonds in Normal and Sterically Compressed o-Hydroxy Aromatic Aldehydes. Isotope Effects on Chemical Shifts and Hydrogen Bond Strength (2019) (10)
- The role of ring substituents on hydrogen bonding of 5-cyano-2-hydroxyacetophenone and 2-hydroxy-4-methoxy-5-nitroacetophenone in the ground and excited states (2007) (10)
- HUMIC SUBSTANCES AND HUMIFICATION (2000) (10)
- Mono- and diprotonation of dihydropyrene, 2,7-di-tert-butyl-dihydropyrene, and their conversion to pyrenium ions; Influence of the radical cation and its potential utility in NMR assignments of the arenium ions of readily oxidizable PAHs (1996) (10)
- Oliveridepsidones A–D, antioxidant depsidones from Garcinia oliveri (2012) (10)
- Monothiodibenzoylmethane : Structural and vibrational assignments (2007) (10)
- Isotope effects on chemical shifts in tautomeric systems with double proton transfer: Citrinin (1998) (10)
- Deuterium Isotope Effects on Carbonyl Carbon Chemical Shifts of BPTI. Hydrogen Bonding and Structure Determination in Proteins. (1989) (10)
- A Reinvestigation of the Ionic Liquid Diisopropylethylammonium Formate by NMR and DFT Methods. (2016) (10)
- Photochromism in p-methylbenzoylthioacetone and related β-thioxoketones (2007) (9)
- Data for the characterization of the geometrical isomers of β‐sulphinylenamines (1994) (9)
- NMR Investigations on Pyrene. The 13C-H Satellite Spectrum. Calculation of Coupling Constants. (1971) (9)
- Deuterium isotope effects on 13C chemical shifts of nitromalonamide (2008) (9)
- Nitration of isopropylpyrenes. Strained models for protonation and transfer-nitration in the condensed phase (1992) (9)
- 1,1′,1′′-(2,4,6-Trihydroxybenzene-1,3,5-triyl)triethanone tautomerism revisited (2014) (9)
- Protonation of benzo[a]pyrene dibenzo[a,e]pyrene and benzo[e]pyrene in superacids: NMR studies of charge distribution in persistent arenium ions and AM1 calculations (1995) (9)
- One‐bond carbon–carbon spin–spin coupling constants: A data summary (1981) (9)
- Deuterium Isotope Effects of 0-Hydroxythioamides, Thiazolines and 5-Acyl-2-thiobarbituric Acids (2000) (9)
- 13C-NMR chemical shift databases as a quick tool to evaluate structural models of humic substances (2010) (9)
- Determination of tautomeric phenotypes of β‐thioxo esters and characterization of the tautomeric enethiolic constituents by means of 13C NMR spectroscopy (1984) (8)
- Ab initio calculations of external charge effects on the isotropic 13C, 15N and 17O nuclear shieldings of amides☆ (1994) (8)
- Synthesis of the N-Allylthioamide Derivatives of Cyclic Oxo- (III) and Dioxo-Acids (VI) and Their Cyclization to the Derivatives of 4,5-Dihydrothiazole. (2001) (8)
- Microwave-Assisted Facile and Rapid Friedel–Crafts Benzoylation of Arenes Catalyzed by Bismuth Trifluoromethanesulfonate (2014) (8)
- Chemical constituents of Geum urbanum L. roots (2018) (8)
- Photochromism and polarization spectroscopy of p-methyl(thiobenzoyl)acetone (2006) (8)
- Letter to the Editor: Sequence-specific resonance assignments of the potent cytolysin equinatoxin II (2000) (8)
- 1H NMR Spin‐echo Spectroscopy of Human Erythrocytes. Transformation of Exogenous Compounds (1990) (8)
- Structural studies of the chemical constituents of Tithonia tagetiflora Desv. (Asteraceae) (2013) (8)
- First examples of fluorinated and chlorinated polycyclic aromatic hydrocarbons (PAH) dications from benzo[a]pyrene, pyrene and their alkyl-substituted derivatives (1998) (8)
- 13C-NMR Chemical Shift Databases as a Quick Tool to Evaluate Structural Models of Humic Substances~!2010-01-15~!2010-02-02~!2010-06-18~! (2010) (8)
- Structural Studies of β-Diketones and Their Implications on Biological Effects (2021) (8)
- A Spectroscopic Overview of Intramolecular Hydrogen Bonds of NH…O,S,N Type (2021) (8)
- Arresting consecutive steps of a photochromic reaction: studies of β-thioxoketones combining laser photolysis with NMR detection. (2014) (7)
- NMR and IR Spectroscopy of Phenols (2005) (7)
- Structure elucidation of four new megastigmanes from Sonneratia ovata Backer (2014) (7)
- NMR Studies of Isotope Effects in Compounds with Intramolecular Hydrogen Bonds (2006) (7)
- Determination of the tautomeric equilibria of pyridoyl benzoyl β-diketones in the liquid and solid state through the use of deuterium isotope effects on (1)H and (13)C NMR chemical shifts and spin coupling constants. (2015) (7)
- Deuterium isotope effects on 13C and 15N chemical shifts of intramolecularly hydrogen-bonded enaminocarbonyl derivatives of Meldrum’s and Tetronic acid (2010) (7)
- Synthesis and characterization of nickel-, palladium-and platinum(II) complexes of three o,o'-dihydroxydiarylazo dyes : Determination of the coordination geometry of this comprehensive series of tridentate diaryl dye complexes by combining results from NMR and X-ray experiments with theoretical ab i (2006) (7)
- Cellular Uptake and Intracellular Phosphorylation of GS-441524: Implications for Its Effectiveness against COVID-19 (2021) (7)
- Secondary thioamide group deformations in different surroundings: The case of intramolecular NH···N hydrogen bond – An X-ray study combined with theoretical calculations (2008) (7)
- Mono- and di-nitroalkyl-(cycloalkyl-)pyrenes in superacid media: dihydroxyiminium-(oxoiminium-)pyrenium dications; cyclisation to long-lived oxazoline-(and 1,2-oxazine-)pyrenium ions, ring opening to form nitrosoalkylpyrenium and nitroso radical cation salts with unprecedented stability (1995) (6)
- Comment on “Spectroscopic studies of keto–enol tautomeric equilibrium of azo dyes” by M. A. Rauf, S. Hisaindee and N. Saleh, RSC Adv., 2015, 5, 18097 (2015) (6)
- Carbon‐carbon [nJ(CO, C)] and carbon‐fluorine coupling constants [nJ(CF)] of ortho‐substituted benzoic acids and acid fluorides: INDO‐SOS calculations and evaluation of rotational effects (1987) (6)
- Hydrogen bonds in “push-pull” enamines (2004) (6)
- Two-dimensional 1H- and 13C-NMR spectra of some azo dyes containing amino or acetamido groups (1989) (6)
- NMR, MP2, and DFT study of thiophenoxyketenimines (o‐thio‐Schiff bases): Determination of the preferred form (2018) (6)
- Greener Friedel-Crafts Acylation using Microwave-enhanced reactivity of Bismuth Triflate in the Friedel-Crafts Benzoylation of Aromatic Compounds with Benzoic Anhydride (2017) (6)
- New deuterium isotope effects on 13C and 19F chemical shifts across intramolecular hydrogen bonds of non-resonance assisted systems (2005) (6)
- Methods to Distinguish Tautomeric Cases from Static Ones (2016) (6)
- Isotope Effects on Chemical Shifts as a Tool in the Study of Tautomeric Equilibria (2013) (6)
- NH Stretching Frequencies of Intramolecularly Hydrogen-Bonded Systems: An Experimental and Theoretical Study (2021) (5)
- Formation of sec-alkylpyrenes by Friedel-Crafts and cathodic alkylation methods. Structure and spectroscopic properties of products. Catalytic hydrogenation of pyrene and some alkyl-pyrenes (1986) (5)
- DISSOLVING METAL AND ELECTROCHEMICAL REDUCTION OF POLYCYCLIC AROMATIC HYDROCARBONS (1979) (5)
- Efficient Friedel–Crafts benzoylation of aniline derivatives with 4-fluorobenzoyl chloride using copper triflate in the synthesis of aminobenzophenones (2016) (5)
- 4-Carboxyl-2,6-dinitrophenylazohydroxynaphthalenes tautomerism NMR re-explained and other methods verified (2017) (5)
- The tautomeric equilibrium and stereochemistry of β-sulfonyl enamines (2002) (5)
- Complete Assignment of 1H and 13C NMR Spectra and Conformational Analysis of Thioamide Cannabinoids (1996) (5)
- 1H NMR of compounds with low water solubility in the presence of erythrocytes: effects of emulsion phase separation (2000) (5)
- The importance of correct tautomeric structures for biological molecules (2015) (5)
- Sequence-specific resonance assignments of the potent cytolysin equinatoxin II (2000) (5)
- Application of the HECADE method to the measurement of long‐range heteronuclear 13C,1H spin–spin coupling constants in tautomeric β‐sulfonylenamines (2000) (5)
- The interaction between esfenvalerate and humic substances of different origin (2000) (5)
- Conformational Studies of Phenyl- and (1-Pyrenyl)triarylmethylcarbenium Ions: Semiempirical Calculations and NMR Investigations under Stable Ion Conditions (1998) (5)
- Intramolecular hydrogen bonding of o-hydroxyesters and related compounds evaluated by deuterium isotope effects on 13C chemical shifts and principal component analysis ☆ (2007) (4)
- Theoretical Calculations Are a Strong Tool in the Investigation of Strong Intramolecular Hydrogen Bonds (2019) (4)
- Probing the charge delocalization mode in methyl-, dimethyl- and methylene-bridged phenanthrenium ions. NMR studies of persistent mono- and di-cations and AM1 calculations (1997) (4)
- A natural abundance 15N NMR investigation of bilirubin IX‐α (1984) (4)
- Differences in the structure of anthocyanins from the two amphibious plants, Lobelia cardinalis and Nesaea crassicaulis (2013) (4)
- Molecular structure, intramolecular hydrogen bond strength, vibrational assignment, and spectroscopic insight of 4-phenylamino-3-penten-2-one and its derivatives: A theoretical and experimental study (2021) (4)
- 13C, 1H and two-dimensional NMR studies of charge distribution in sterically congested persistent cycloalkyl- and alkyl-pyrenium ions generated by protonation in superacid media (1994) (4)
- Deuterium isotope effects on 13C chemical shifts of negatively charged NH…N systems (2013) (4)
- NMR of Natural Products as Potential Drugs (2021) (4)
- Cytotoxic geranylated xanthones and O-alkylated derivatives of alpha-mangostin. (2009) (4)
- Prototropic processes in benzaurins. 19F and 1H NMR spectra of fluoro- and methylsubstituted 4-hydroxyphenyl-diphenylcarbinols, related fuchsones and benzaurins (2011) (4)
- In vitro α-glucosidase inhibitory activity of compounds isolated from mangrove Lumnitzera littorea leaves (2019) (4)
- 13C,13C coupling constants from a mixture of isotopomers (13C) of substituted aromatic compounds; 1‐nitronaphthalenes (1981) (3)
- SEQUENCE AND STRUCTURAL ANALYSIS OF κ‐CARRAGEENAN‐DERIVED OLIGOSACCHARIDES BY TWO‐DIMENSIONAL NUCLEAR MAGNETIC RESONANCE 1 (2010) (3)
- Isomerization and aggregation of 2-(2-(2-hydroxy-4-nitrophenyl)hydrazono)-1-phenylbutane-1,3-dione: Recent evidences from theory and experiment (2019) (3)
- Acetyl cedrene and its follower. An Isotopic, NMR and MS Structure elucidation and deuteriation study (2011) (3)
- Two new sesquiterpenes from the stems of Miliusa velutina (2020) (3)
- Intramolecular Hydrogen Bonding of 5-Acyl-3-methylrhodanines (2008) (3)
- Does an OH or an OD Group Form the Strongest Hydrogen Bond to Oxygen (1987) (3)
- Cytotoxic Geranylated Xanthones and O‐Alkylated Derivatives of α‐Mangostin (2010) (3)
- Synthesis, Structure Elucidation and Cytotoxicity of (+)-Usnic AcidDerivatives on U87MG Glioblastoma Cells (2016) (3)
- Azo-hydrazone molecular switches: Synthesis and NMR conformational investigation. (2021) (3)
- Solution structure of the eukaryotic pore-forming cytolysin equinatoxin II (2002) (2)
- Photoinduced and ground state conversions in a cyclic β-thioxoketone (2021) (2)
- An Efficient and Green Synthesis of 1-Indanone and 1-Tetralone via Intramolecular Friedel—Crafts Acylation Reaction. (2015) (2)
- Secondary Isotope Effects on 13C and 15N Chemical Shifts of Schiff Bases Revisited (2013) (2)
- Derivatives of usnic acid cause cytostatic effect in Caco-2 cells (2020) (2)
- Fast preparation of dihydrocyclocitral from citronellal under solventless microwave irradiation (2005) (2)
- Solution and solid state 13C NMR and X-ray studies of genistein complexes with amines. Potential biological function of the C-7, C-5, and C4'-OH groups. (2003) (2)
- Stability of the oxidized form of RuLL′(NCS)2 dyes in acetonitrile in the presence of water and pyridines – Why the dye-sensitized solar cell electrolyte should be dry (2019) (2)
- Isotope Effects on Chemical Shifts in the Study of Hydrogen Bonds in Small Molecules (2022) (2)
- Strong intramolecular hydrogen bonds and steric effects involving C═S groups: An NMR and computational study (2019) (2)
- First Examples of Fluorinated and Chlorinated Polycyclic Aromatic Hydrocarbon (PAH) Dications from Benzo[a]pyrene, Pyrene, and Their Alkyl‐Substituted Derivatives (1999) (2)
- One‐bond 1J(15N,H) coupling constants at sp2‐hybridized nitrogen of Schiff bases, enaminones and similar compounds: A theoretical study (2020) (2)
- Erbium Trifluoromethanesulfonate Catalyzed Friedel—Crafts Acylation Using Aromatic Carboxylic Acids as Acylating Agents under Monomode-Microwave Irradiation. (2015) (2)
- Low-Temperature IR- and NMR-Studies of 3,3,6,6-Tetramethylcycloheptanone. (1972) (2)
- Intrinsic Deuterium Isotope Effects on NMR Chemical Shifts of Hydrogen Bonded Systems (2002) (2)
- Curcumin analogues for possible cancer treatment A QSAR and partial ordering study (2021) (2)
- Determination of K ow of Substituted Polycyclic Aromatic Compounds (1997) (2)
- Efficient Friedel-Crafts Benzoylation of Aniline Derivatives with 4-Fluorobenzoyl Chloride Using Copper Triflate in the Synthesis of Aminobenzophenones. (2016) (1)
- Author response for "One-bond 1 J ( 15 N,H) coupling constants at sp 2 hybridized nitrogen of Schiff bases, enaminones and similar compounds. A theoretical study" (2020) (1)
- A new sesquiterpene lactone from the leaves of Panax vietnamensis Ha et Grushv. (Vietnamese ginseng). (2022) (1)
- C-13 NMR, X-ray and differential scanning calorimetry investigations of truncated BPTI mutants: salt bridge formation (1998) (1)
- CHEMICAL CONSTITUENTS FROM LEAVES OF SONNERATIA ALBA (2012) (1)
- Aggregation of amphiphilic molecules in water. I. α‐phenylethylamine: 1H and 13C NMR study (1991) (1)
- Tautomerism and biological activity of beta-diketoner, triketoner, beta-ketoesters and beta-ketoamides. A mini review (2017) (1)
- Deuterium Isotope Effects on Chemical Shifts of Ammonium Ions: A Solid State NMR Study (2011) (1)
- The best density functional theory functional for the prediction of 1H and 13C chemical shifts of protonated alkylpyrroles (2021) (1)
- Multi-Step Rearrangement Mechanism for Acetyl Cedrene to the Hydrocarbon Follower† (2017) (1)
- Nuclear magnetic resonance spectroscopy of CC, CO, CN and NN double bonds (2010) (1)
- On Development of Fungicide Tolerance in vitro in Mycogone perniciosa (Magn.) Delacr. and Verticillium fungicola (Preuss) Hassebr (1983) (1)
- Isotope effects on chemical shifts in the study of hydrogen bonded biological systems. (2020) (1)
- Isolation and preparation of cytotoxic chromanone acids from the bark of Calophyllum dongnaiense (2009) (1)
- Stable Ion Studies of the Chrysene Skeleton. Protonation of Chrysene, 6‐Halochrysenes, 6‐Acetylchrysene, and 4H‐Cyclopenta(def)chrysene: NMR Studies of Charge Distribution in Chrysenium Cations and AM1 Calculations. (1997) (1)
- Structure of a new usnic acid derivative from a deacylating Mannich reaction: NMR studies supported by theoretical calculations of chemical shifts (2018) (1)
- Tautomerism of Pyridinylbutane-1,3-diones. An NMR and DFT study. (2023) (0)
- Nuclear magnetic resonance of acids and acid derivatives (2010) (0)
- Triterpenoids from the leaves of Ilex kaushue S.Y.HU (Aquifoliaceae) (2009) (0)
- Indium Triflate in 1-Isobutyl-3-methylimidazolium Dihydrogen Phosphate (IOL): An Efficient and Green Catalytic System for Friedel—Crafts Acylation. (2015) (0)
- Synthesis and Anti-HIV Activity of 5-Alkoxymethyl-3′-azido-2′,3′- dideoxyuridines. (1993) (0)
- An Efficient and Green Method for Regio‐ and Chemo‐Selective Friedel—Crafts Acylations Using a Deep Eutectic Solvent ([CholineCl][ZnCl2]3). (2016) (0)
- Deuterium isotope effects of omikron-hydroxythioamides, 2 delta--thiazolines and 5-acyl-2-thiobarbituric acids (2000) (0)
- Oliveridepsidone A-D, four new prenylated depsidones from the bark of Garcinia Olivieri (2008) (0)
- NMR Spectroscopy of Carbon-Carbon, Carbon-Oxygen, Carbon-Nitrogen, and Nitrogen-Nitrogen Double Bonds (1991) (0)
- Reversed phase HPLC used for the determination of partition coefficients (1995) (0)
- Charge Delocalization Pathways in Persistent 1‐Pyrenyl‐, 4‐Pyrenyl‐, and 2‐Pyrenylmethylcarbenium Ions as Models of PAH‐Epoxide Ring Opening: NMR Studies in Superacids and AM1 Calculations. (1998) (0)
- Some Triterpenoid and Phenolic compounds from the leaves of Sonneration Alba J.E.Smith and their acetylesterase inhibition (2011) (0)
- IR OF PYRENE DERIVATIVES. RELATION TO THE SUBSTITUTION PATTERN (1981) (0)
- Isolation and Determination of Phenolics from the Bark of Calophyllum calaba L. var. bracteatum (Wight) Stevens (2008) (0)
- Tautomerism of β-Diketones and β-Thioxoketones (2023) (0)
- Structure Identification of Novel Compounds Using Simple IR, 1 H, and 13 C NMR Spectroscopy and Computational Tools (2019) (0)
- Isotope effects on C-13 and N-15 chemical-shifts in proteins from electric-field effects (1995) (0)
- quinoline : switching between single-and double-well proton transfer through structural modi fi cations (2015) (0)
- One-bond C-H coupling constants of acetyl groups as possible monitors of ch hydrogen bonds and electric field effects (2003) (0)
- Tautomerism in Alicyclic Lactams: Six-Membered Rings 13 2.4 Tautomerism in Alicyclic Lactams: 2-Pyrrolidinone 14 2.5 Tautomerism in Other Five-Membered Ring Lactams 16 2.6 Tautomeric Ratios Requiring Computation: Alicyclic β-Diketones 17 2.7 Tautomeric Ratios Requiring Computation: “Maleic Hydrazide (2016) (0)
- The Best DFT Functional for the Prediction of 1H and 13C Chemical Shifts of Protonated Alkylpyrroles (2021) (0)
- Hydrogen bonding - a key modeling parameter in nano and bio-systems (2014) (0)
- CHEMICAL CONSTITUENTS FROM LEAVES OF SONNERATIA ALBA J.E. SMITH (SONNERATIACEAE) (2011) (0)
- Calobixanthone, a New bis-Xanthone from the Bark of Calophyllum dongnaiense (2007) (0)
- Carbon-Carbon Coupling Constants: Data (108 Literaturangaben). (1982) (0)
- Intramolecular Hydrogen Bonding and Tautomerism of Acylpyran-2,4- diones, -2,4,6-triones and Acylpyridinediones and Benzanellated Derivatives. Deuterium Isotope Effects on 13C NMR Chemical Shifts. (1996) (0)
- Microwave-Assisted Facile and Rapid Friedel—Crafts Benzoylation of Arenes Catalyzed by Bismuth Trifluoromethanesulfonate. (2015) (0)
- Deuterium Isotope effects on 17-O chemical shifts of intramolecularly bonded systems (1999) (0)
- NMR of complex, heterogenous structures exemplified by humic substances. (2020) (0)
- Marine Bromophenols, synthesis, biological effects (2020) (0)
- Tautomerism detected by NMR (2020) (0)
- Partitioning of polycyclic aromatic compounds between soot particles and water studied by applying natural aromatic macromolecules as model substrates for soot particles (1997) (0)
- Vibrational spectra, conformation and molecular transport of 5-amino-2,2,6,6-tetramethyl-4-hepten-3-one (2022) (0)
- Isolation and Biological Testing of Constituents from Ilex kaushue S.Y.Hu (Aquifoliaceae) Vietnam (2019) (0)
- Resonance assisted hydrogen bonding (RAHB). What is the evidence using Isotopes (2010) (0)
- Editorial [Hot Topic:Polyphenols(Guest Editor: Poul Erik Hansen)] (2009) (0)
- Isotope Effects on Nuclear Shielding as a Means of Studying Solute-Solvent Interactions (1987) (0)
- Isotopic Perturbation of Equilibrium in 2,6-Dihydroxybenzoyl Compounds. A 13C and 1H NMR Investigation (1989) (0)
- Protonation of Benzo(a)pyrene, Dibenzo(a,e)pyrene and Benzo(e)pyrene in Superacids: NMR Studies of Charge Distribution in Persistent Arenium Ions and AM1 Calculations (2010) (0)
- Synthesis, molecular structure, conformational, and intramolecular hydrogen bond strength of ethyl 3-amino-2-butenoate and its N-Me, N-Ph, and N-Bn analogs; an experimental and theoretical study (2022) (0)
- Hydrogen bonding and tautomerism of natural products. Use of deuterium isotope effects on chemical shifts and ab initio calculations in structural studies (2010) (0)
- Formation of sec‐Alkylpyrenes by Friedel‐Crafts and Cathodic Alkylation Methods. Structure and Spectroscopic Properties of Products. Catalytic Hydrogenation of Pyrene and Some Alkylpyrenes. (1987) (0)
- formations of piroxicam in solution : a combined experimental and theoretical study † (2015) (0)
- Carbon-Carbon Coupling Constants: Discussion (192 Literaturangaben). (1982) (0)
- Ammonium Ions: A Solid State NMR Study (2014) (0)
- NMR structure of a DNA duplex with two INA nucleotides inserted opposite each other, dCTCAACXCAAGCT:dAGCTTGXGTTGAG (2004) (0)
- Protic ionic liquids, their constitution, properties and use (2014) (0)
- Reactivity and Diastereoselectivity of Michael Additions of Amines to Achiral α,β-Unsaturated Thioamides. (2002) (0)
- Further Insight via 15N NMR Spectroscopy into the Reactive Intermediates Formed by Superacid Protonation of Crowded Nitro‐PAHs: Persistent Dihydroxyiminiumpyrenium and Hydroxyiminiumpyrenium Dications. (1998) (0)
- Structure Elucidation and Biological Effects of Carrageenans from Red Algae (2013) (0)
- Assignment of the natural abundance carbon-13 spectrum of proteins using carbon-13-proton detected heteronuclear multiple-bond correlation NMR spectroscopy: structural information and stereospecific assignments from two- and three-bond carbon-hydrogen coupling constants. [Erratum to document cited i (1992) (0)
- Deuterium Isotope Effects on Nuclear Shielding. Directional Effects and Nonadditivity in Acyl Derivatives (1986) (0)
- Flavonoid Content in Vietnamese Tea (2006) (0)
- Easy prediction of primary and secondary deuterium isotope effects on chemical shifts of intramolecularly hydrogen bonded systems (2012) (0)
- Greener Friedel-Crafts Acylations (2016) (0)
- Structure of protic ionic liquids studies by NMR, IR and DFT calculations. An isotope effect study (2014) (0)
This paper list is powered by the following services:
Other Resources About Poul Erik Hansen
What Schools Are Affiliated With Poul Erik Hansen?
Poul Erik Hansen is affiliated with the following schools:
