Results 211 to 220 of about 56,095 (275)

Development and Validation of Atomic Group Descriptors for Substituent Effects. [PDF]

J Comput Chem
Lefrancois-Gagnon K, Mawhinney R.
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A Two-In-One Versatile Colorimetric Sensor for Cyanide Anion and Volatile Amines Based on 1‑Hydroxyanthraquinone with Electron-Withdrawing Groups. [PDF]

ACS Omega
Martyanov TP, Kudrevatykh AA, Mudrykh MA, Musaev ME, Korchagin DV, Sulimenkov IV, Ushakov EN, Klimenko LS.   +7 more
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50 Years of Giese Reaction - a Personal View. [PDF]

Angew Chem Int Ed Engl
Spichty M, Zipse H, Majouri S, Fromm KM, Giese B.   +4 more
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The Substituent Constants for Some Electrophilic Reactions

The Substituent Constants for Some Electrophilic Reactions
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Relationship between protonproton NMR coupling constants and substituent electronegativities. V—Empirical substituent constants deduced from ethanes and propanes

Magnetic Resonance in Chemistry, 1989
AbstractThe electronegativity dependence of the torsion angle‐independent term in the Karplus equation, i.e. of the ‘constant’ A in the Fourier expansion A + B cos ϕ + C cos 2ϕ +…, was investigated. Experimental proton‐proton coupling constants of substituted ethanes and isopropanes appeared to be suitable for this purpose.
Cornelis Altona, Johannes H. Ippel, Aldert J. A. Westra Hoekzema, Cornelis Erkelens, Michel Groesbeek, Lambertus A. Donders   +5 more
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Electrophilic Substituent Constants

Journal of the American Chemical Society, 1958
Herbert C. Brown, Y. Okamoto
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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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Substituent Constants of Azulene

Journal of Pharmaceutical Sciences, 1980
The ionization constants in water for six 3-substituted azuloic acids were determined spectrophotometrically. Conversion of these physical constants to their pKa values allowed a set of Hammett-type sigma values for the substituents on these acids to be calculated.
M R, Lichtenwalner, T J, Speaker
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Substituent constants for correlation analysis

Journal of Medicinal Chemistry, 1977
Constants for pi and omega ahve been measured for a miscellaneous group of aromatic substituents of interest to medicinal chemists. Swain and Lupton's gamma and kappa values have been calculated from the omego constants. Values for molar refractivity are also given for each of the substituents.
C, Hansch, S D, Rockwell, P Y, Jow, A, Leo, E E, Steller   +4 more
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Hammett Substituent Constants

2021
Benzoic acid ionizes into C6H5CO2− and H+ only partially in water. However, this ionization is rendered facile by electron-withdrawing substituents and more difficult by electron-rich substituents on the aromatic ring. The effect on ionization is also dependent on the position of the substituent on the ring in respect of the carboxylic acid group ...
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