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Abstract

Reactions of R¹-substituted benzenecarboxylic acids (R¹ = H, Me, Et, and t-Bu) with R²MgX (R² = Et and n-Pr) in the presence of nickel produce ketyl radicals R¹-Ar-CO^.-R². Average values of splitting constants of the protons in the aromatic nucleus are a₂ = a₆ = 0.48 mT, a₄ = 0.53 mT, and a₃, a₅ < 0.12 mT. In some cases for R² = n-Pr interaction of gamma protons is also observed with a₂ = 0.04 mT. The investigated substituents R¹, R² have no marked influence on distribution of spin density of the unpaired electron.