Results 131 to 140 of about 1,354 (166)

Theoretical considerations concerning the hammett equation — VIII

Tetrahedron, 1963
Abstract The resonance contribution, PR, to Hammett p values, and the Taft-Lewis parameter α have been calculated for five aromatic oxygen acids. The method of calculation consisted of a crude calculation by the LCAO MO method of the changes of charge distribution in an acid molecule effected by a substituent, and an assessment of the effect of this ...
J.L. Roberts, H.H. Jaffé
openaire   +1 more source

APPLICATION OF THE HAMMETT EQUATION TO THE HYDROLYSIS OF SUBSTITUTED BENZAMIDES

Canadian Journal of Chemistry, 1960
not available
J. T. Edward, H. S. Chang, K. Yates, Ross Stewart   +3 more
openaire   +1 more source

An application of the hammett equation to the cathodic reduction of aromatic acids

Electrochimica Acta, 1976
Abstract Nine aromatic acids were cathodically reduced in aqueous acid medium. Lead was the main cathode metal employed, though experiments on Cu, Fe, Cd, Sn and Cu/Hg as well as PbSn alloys are also reported. At all potentials, hydrogen evolution was the dominant electrode reaction.
M.D. Birkett, A.T. Kuhn
openaire   +1 more source

The Hammett Equation—the Present Position

1972
This chapter represents—in a certain sense—the introduction to the whole book, since the Hammett equation is the oldest and most developed empirical relationship, and many general features can be demonstrated by using it as the only available example. For this reason this chapter will deal with the Hammett equation in a broad sense and many statements ...
openaire   +1 more source

ChemInform Abstract: The Prehistory of the Hammett Equation

ChemInform, 2000
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
openaire   +1 more source

A note on the extended Hammett equation for radical reactions

Tetrahedron, 1972
Abstract A critical examination of the extended Hammett equations proposed for radical reactions is presented. It is shown that the resonance parameters are in error and that the use of these relations may bring about false conclusions concerning the mechanism of the reaction studied.
openaire   +1 more source

A relationship between dipole moments and the Hammett equation

Recueil des Travaux Chimiques des Pays-Bas, 1957
AbstractAn empirical formula is proposed relating the constant ω in the Hammett equation to the observed dipole moment of a compound (para‐ or meta‐ C6H4XY). This relationship is checked by using data which have been cited in the literature. These data appear to confirm the proposed linear behaviour when log μ is plotted against σ.
openaire   +1 more source

On Hepler’s Treatment of the Hammett Equation

Zeitschrift für Physikalische Chemie, 1974
D. K. Hazra, S. C. Lahiri
openaire   +1 more source

Application of Hammett equation to hydrogen bond interactions of benzoic acid in chloroform/water system and explanation for non-linear Hammett relation to partition coefficients for the same system

Computational and Theoretical Chemistry, 2020
Jagannadham Vandanapu, Adam Skelton
exaly  

On the Generality of the Hammett Equation

The Journal of Organic Chemistry, 1961
openaire   +1 more source