PREPARATION OF C-SUBSTITUTED PIPERIDINE

摘要

A process for the preparation of a carbon-substituted piperidine by the hydrogenation of a N-substituted gamma -cyanoketoimine in the presence of a hydrogenation catalyst, is disclosed. A primary amine having the same substituent as the nitrogen atom of the starting gamma -cyanoketoimine is receovered in high yield from the reaction mixture. The carbon substituted piperidines thus produced are useful as starting materials for the production of herbicides or pharmaceuticals.