Author:
Happer DAR,McKerrow SM,Wilkinson AL
Abstract
Previous studies (Part I)
have shown that the 13C resonance positions of the β-carbon of
both meta- and para-substituted β-nitrostyrenes are well correlated by means
of the Hammett equation if σ+ constants are used for para + R
substituents. These data have now been supplemented with measurements made on
five additional series: cinnamic acids, cinnamate ions, styrenes, β,β-dimethyl- and β,β-dicyano-styrenes.
��� The combined information has been analysed
by means of three ?dual substituent parameter? versions of the Hammett
equation. The results confirm that all three are only approximations, but that
the Yukawa- Tsuno and Ehrenson-Brownlee-Taft relationships are significantly
better than Swain's F/R treatment.
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