Amino cyclization of terminal (α,ω)-diols over modified ZSM-5 catalysts

Abstract

The cyclization of terminal diols with ammonia was carried out over modified ZSM-5 catalyst, to obtain the desired saturated heterocyclic product in high yields and selectivity. In the reaction of 1,4-butanediol and ammonia at 250 °C, >95% yield was obtained of pyrrolidine over FeZSM-5 and CuZSM-5 catalysts. The high yield of piperidine, >62–90% was obtained over NiZSM-5 and CuZSM-5 in the reaction of pentanediol and ammonia. Similarly, ≥88% yield was obtained of hexamethyleneimine over CeZSM-5 in the reaction of hexanediol and ammonia.