Acylation Reactions of Phenylhydrazines. Preparation and Properties of New Diacylphenylhydrazines

Anhydride acylation reactions of a variety of substituted arylhydrazines under mild conditions led to controlled formation of the acid phenylhydrazides I (Table I). The procedures were tailored to the particular state of the starting arylhydrazine. Second-stage acylation of phenylhydrazides conveniently produced the N,N'-diacylphenylhydrazines II (Table II), In which the acyl groups were the same or nonidentical. β acylation of phenylhydrazine resulted In significant changes In the ultraviolet spectrum (Table III); the ultraviolet spectra thus provide useful data in the determination of the extent and site of acylation.