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Helmi Neuvonen

Observed names: H. NEUVONEN, H. Neuvonen, Helmi NEUVONEN, Neuvonen, Helmi
Institution: University of Turku
OpenAlex ID: A5075823048
Electron-Withdrawing Substituents Decrease the Electrophilicity of the Carbonyl Carbon. An Investigation with the Aid of13C NMR Chemical Shifts, ν(CO) Frequency Values, Charge Densities, and Isodesmic Reactions To Interprete Substituent Effects on Reactivity
2002 · Helmi Neuvonen, Kari Neuvonen, et al. · The Journal of Organic Chemistry · 106
Evidence of Substituent-Induced Electronic Interplay. Effect of the Remote Aromatic Ring Substituent of Phenyl Benzoates on the Sensitivity of the Carbonyl Unit to Electronic Effects of Phenyl or Benzoyl Ring Substituents
2004 · Helmi Neuvonen, Kari Neuvonen, et al. · The Journal of Organic Chemistry · 69
Substituent Influences on the Stability of the Ring and Chain Tautomers in 1,3-O,N-Heterocyclic Systems: Characterization by13C NMR Chemical Shifts, PM3 Charge Densities, and Isodesmic Reactions
2001 · Kari Neuvonen, Ferenc Fülöp, et al. · The Journal of Organic Chemistry · 59
Substituent Cross-Interaction Effects on the Electronic Character of the CN Bridging Group in Substituted Benzylidene Anilines − Models for Molecular Cores of Mesogenic Compounds. A13C NMR Study and Comparison with Theoretical Results
2006 · Helmi Neuvonen, Kari Neuvonen, et al. · The Journal of Organic Chemistry · 58
Correlation analysis of carbonyl carbon 13C NMR chemical shifts, IR absorption frequencies and rate coefficients of nucleophilic acyl substitutions. A novel explanation for the substituent dependence of reactivity
1999 · Helmi Neuvonen, Kari Neuvonen · Journal of the Chemical Society Perkin Transactions 2 · 55
Comparison of the Electronic Structures of Imine and Hydrazone Side-Chain Functionalities with the Aid of13C and15N NMR Chemical Shifts and PM3 Calculations. The Influence of CN-Substitution on the Sensitivity to Aromatic Substitution
2003 · K. Neuvonen, F. Fülöp, et al. · The Journal of Organic Chemistry · 51
Kinetics and mechanisms of reactions of pyridines and imidazoles with phenyl acetates and trifluoroacetates in aqueous acetonitrile with low content of water: nucleophilic and general base catalysis in ester hydrolysis
1987 · Helmi Neuvonen · Journal of the Chemical Society Perkin Transactions 2 · 35
A Correlation Analysis of C:N 13C Chemical Shifts. The Use of Substituted Benzaldehyde (2-Hydroxycyclohexyl)hydrazones as Probes
1994 · Kari Neuvonen, Ferenc Fueloep, et al. · The Journal of Organic Chemistry · 28
Correlation analysis of the13C chemical shifts of substituted benzaldehyde 2-aminobenzoylhydrazones. Study of the propagation of substituent effects along a heteroatomic chain
1997 · Kari Neuvonen, Ferenc F�l�p, et al. · Journal of Physical Organic Chemistry · 26
Neutral hydrolysis and imidazole-catalysed decomposition of bis(4-nitrophenyl) oxalate. 1,1′-Oxalyldiimidazole as an intermediate
1995 · Helmi Neuvonen · Journal of the Chemical Society Perkin Transactions 2 · 26
Propagation of Polar Substituent Effects in 1-(Substituted phenyl)-6,7-dimethoxy-3,4-dihydro- and -1,2,3,4-tetrahydroisoquinolines As Explained by Resonance Polarization Concept
2005 · Kari Neuvonen, Ferenc Fülöp, et al. · The Journal of Organic Chemistry · 24
Effect of the acyl group in the reaction of imidazole with acyl-substituted 4-nitrophenyl acetates in acetonitrile and in aqueous acetonitrile with a low water content
1995 · Helmi Neuvonen · Journal of the Chemical Society Perkin Transactions 2 · 22
A two-intermediate model for imidazole-promoted peroxyoxalate chemiluminescence
1997 · Helmi Neuvonen · Journal of Bioluminescence and Chemiluminescence · 17
DFT study of the substituent cross-interaction effects on the conformation of substituted N-benzylideneanilines – Models of liquid crystal forming compounds: Use of 13C NMR chemical shift of the C N Carbon as a tool to predict the conformation of the molecule
2007 · Helmi Neuvonen, Kari Neuvonen, et al. · Journal of Molecular Structure THEOCHEM · 16
Ab Initio Study of the Substituent Effects on the Relative Stability of theEandZConformers of Phenyl Esters. Stereoelectronic Effects on the Reactivity of the Carbonyl Group
2005 · Helmi Neuvonen, Kari Neuvonen, et al. · The Journal of Physical Chemistry A · 16
Electronic effects of heterocyclic ring systems as evaluated with the aid of 13C and 15N NMR chemical shifts and NBO analysis
2008 · H. Neuvonen, F. Fülöp, et al. · Journal of Physical Organic Chemistry · 15
Effect of 4-substitution on psychotomimetic activity of 2,5-dimethoxy amphetamines as studied by means of different substituent parameter scales
2006 · Kari Neuvonen, Helmi Neuvonen, et al. · Bioorganic & Medicinal Chemistry Letters · 14
Kinetics of the decomposition of a chemiluminescent reagent bis(2,4-dinitrophenyl) oxalate in aqueous acetonitrile
1994 · Helmi Neuvonen · Journal of the Chemical Society Perkin Transactions 2 · 14
Airborne allergic contact dermatitis from 4‐(bromomethyl)benzoic acid in a university chemist
2008 · Kaija Lammintausta, Helmi Neuvonen · Contact Dermatitis · 12
General base catalysis in the methanolysis of 4-nitrophenyl acetates
1990 · Helmi Neuvonen · Journal of the Chemical Society Perkin Transactions 2 · 10
Neutral hydrolysis of substituted phenyl trifluoroacetates in water–acetonitrile mixtures with low content of water
1986 · Helmi Neuvonen · Journal of the Chemical Society Perkin Transactions 2 · 9
Investigation of the applicability of cis-urocanic acid as a model for the catalytic Asp–His dyad in the active site of serine proteases based on 1H NMR hydrogen bonding studies and spectroscopic pKa measurements
1998 · Helmi Neuvonen, Kari Neuvonen · Journal of the Chemical Society Perkin Transactions 2 · 7
Taft equation in the light of NBO computations. Introduction of a novel polar computational substituent constant scale for alkyl groups
2011 · Kari Neuvonen, Helmi Neuvonen, et al. · Computational and Theoretical Chemistry · 6
NBO analysis of polar and steric effect using the axial-equatorial equilibrium of cyclohexyl acetates as a probe
2011 · Kari Neuvonen, Helmi Neuvonen, et al. · Computational and Theoretical Chemistry · 6
Solvent effect on activation parameters for the neutral hydrolysis of phenyl trifluoroacetates in aqueous acetonitrile
1987 · Helmi Neuvonen · Journal of the Chemical Society Perkin Transactions 2 · 5
Works count: 40
Citation count: 718
H-index: 15
I10-index: 20
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