METHOD FOR PRODUCING PIPERIDONE KETAL BY USING POLYPHOSPHORIC ACID

摘要

PROBLEM TO BE SOLVED: To provide a method for producing piperidone ketal, having a further improved advantageous point of capable of easily synthesizing the ketal without accompanying a difficult point of removing water by an azeotropic distillation from a reaction mixture. SOLUTION: This method for producing the piperidone ketal comprises the condensation of an alcohol with piperidone in the presence of polyphosphoric acid. COPYRIGHT: (C)2005,JPO&NCIPI