A new facile method for monoacylation of diols has been developed. A variety of cyclic and acyclic diols, in particular 1, 2-diols, were selectively monobenzoylated in good yields by the reaction with benzoyl chloride in the presence of a catalytic amount of dimethyltin dichloride and inorganic bases such as potassium carbonate. Furthermore, the method was successfully applied to a kinetic resolution of racemic 1-phenyl-1, 2-ethanediol using a ...