83924-46-3Relevant academic research and scientific papers
Kinetics of Reaction of Picryl Bromide with Substituted Biphenyl-4-carboxylate Ions
Ananthakrishnanadar, P.,Kannan, Nagaratnam
, p. 1305 - 1308 (2007/10/02)
Second-order rate constants have been measured for the reactions of picryl bromide with 2'-, 3'-, and 4'-substituted biphenyl-4-carboxylate ions in 80percent methanol-water at several temperatures and activation parameters have been calculated.The Hammett equation applies very well to the reactions of 3'- and 4'-substituted biphenyl-4-carboxylate ions with ? values calculated by the FMMF method.The effect of 2'-substituents is understandable in terms of ?-electron steric effects.The rate constants correlate with the pKa values of the correspondingly substituted biphenyl-4-carboxylic acids.In the case of 3'- and 4'-substituted biphenyl-4-carboxylate ions such a correlation leads to an α-value of 0.52 indicating substantial bonding in the transition state.
