Hydroxamic acids. III. Mass spectra of substituted hydroxamic acids and cyclic imides

Abstract

Aryl hydroxamic acid derivatives fragment in a diagnostic manner upon electron impact. A hydroxamic acid containing both styryl and benzyl substituents undergoes skeletal-rearrangement of the type ABC → AC+B. The mass spectra of the O- and N-acetyl derivatives of O- benzylhydroxamic acids are indistinguishable. M-CO₂ fragments are again observed in the mass spectra of several substituted phthalimides.