A nuclear magnetic resonance study of the addition of methanol and methoxide ions to substituted benzaldehydes, and corresponding JM acidity function values

Abstract

Values of the equilibrium constants, K_S, for the addition of methanol, and K_OR, for the addition of methoxide ions at the carbonyl group of a series of eleven substituted benzaldehydes have been determined by using an n.m.r. method. The results lead to the determination of a new J_M acidity scale for methanolic sodium methoxide solutions which is compared with existing functions.