Abstract

AbstractDetermination of the pKa′ value for the carboxylic function of 3,5‐dimethyl‐4‐[(2,2,5,5‐tetramethylcyclopentylidene)amino]‐benzoic acid (2) in aqueous alcohols leads to the Hammett substituent parameter σp = +0.07 (±0.07) for the imino group whose π‐electron system is orthogonal to that of the mediating aromatic ring.

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