METHOD FOR THE PRODUCTION OF OMEGA LACTAMS AND THEIR PRECURSORS BY FORMATION AND NITROSATION OF THE CYCLOMETHYLENE KETENE-SO2 ADDUCT AND PRODUCTS OBTAINED THEREBY

摘要

ABSTRACTA method for the preparation of omega lactamsis disclosed, more particularly epsilon caprolactamor a precursor thereof (such as cyclohexanone oxime),using as the starting material a cyclomethylene ketene,with the simultaneous formation of side products suchas cyclohexanecarboxylic acid, wherein an adduct is pre-liminarly formed between cyclomethylene ketene andsulphur dioxide. The adduct is then reacted with anitorsating agent so as to obtain, under the appropriatereaction conditions, the expected lactam, more specifical-ly epsilon caprolactam.