Results 241 to 250 of about 363,660 (280)

Substituent effects on hyperfine coupling constants

1988
27 monosubstituted benzenes OX were measured either as pure liquids or in concentrated solutions. We use toluene as a model case to discuss the observed features and the assignment procedure. Three spectra are shown in Figure 5.1. At 3 kG three pairs of lines are observed (top).
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Determination of Lipophilicity Constants of Sulfonamide Substituents

Journal of Chemical Education, 2001
This article describes a simple laboratory activity using reversed-phase thin-layer chromatography (a stationary nonpolar phase and a mobile polar phase). The Rf values determined for sulfonamides by means of reversed-phase thin-layer chromatography are used to calculate the chromatographic parameter Rm and the lipophilicity constants (π) of different ...
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ChemInform Abstract: Substituent Constants and Substituent Effects in Organoselenium and Organotellurium Compounds

ChemInform, 2013
AbstractReview: 99 refs.
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Electrophilic Substituent Constants

Journal of the American Chemical Society, 1958
Herbert C. Brown, Y. Okamoto
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Polar ortho-substituent constants

Chemical Communications (London), 1968
G. G. Smith, K. K. Lum
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Spectroscopic substituent constants for ligands

Inorganic Chemistry, 1975
Luigi G. Marzilli, Peter. Politzer, William C. Trogler, Robert Charles. Stewart   +3 more
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A Web Tool for Calculating Substituent Descriptors Compatible With Hammett Sigma Constants

Chemistry Methods, 2022
Peter Ertl
exaly  

A G4 Approach to Computing the Hammett Substituent Constants σp, σm, σ−, σ+, and σ+m

Journal of Physical Organic Chemistry, 2023
Paul Rablen
exaly  

Aromatic substituent constants for structure-activity correlations

Journal of Medicinal Chemistry, 1973
C, Hansch, A, Leo, S H, Unger, K H, Kim, D, Nikaitani, E J, Lien   +5 more
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The charge-transfer constant. A new substituent constant for structure-activity relationships.

Journal of medicinal chemistry, 1975
A new, versatile constant accounting for the pi-complex formation ability of aromatic systems is proposed. The constant is derived from charge-transfer complex data of aromatic species (charge-transfer constant, CT). The applicability of CT in structure-reactivity relations is demonstrated.
B, Hetnarski, R D, O'Brien
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