Highly chlorinated diphenyl(2-pyridyl)methyl radicals and their α-H precursors with a carboxy, chlorocarbonyl, or allyloxycarbonyl substituent in the 4-position of one phenyl ring have been synthesized. All of them are stable red solids, completely dissociated, (magnetic susceptibility), decomposing when melting (200–240 °C). Their ESR, UV–VIS and IR spectra are given.
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Juliá et al. (1991) studied this question.
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