The paramagnetic species produced in the reactions of organometallic compounds XIII—the anion radicals of carboxylates

In the reactions of meta- and para-alkyl substituted benzoic acids with aryl Grignard reagents, in tetrahydrofuran solutions and in the presence of nickel salts, the ESR spectra of the anion radicals of carboxylates derived from the benzoic acids were observed which represent the intermediates in the formation of ketyl radicals.