Abstract: Instead of usual cyclic secondary amines such as morph'oline etc., the N-metlylpiperazine was used in the Stork enamine acylation reactions and the following facts were found:1.The external neutralizer, such as TEA, used in usual procedure cannot be added now because a tertiary amine group is present in the N-methylpiperazine ring, but the yields of acylated enamines are less than that where TEAis added.2. The isolation of acylated enamine hydrochlorides is still difficul't for these hydrochlorides are h'ydroscopic and decompose readily on standing.3. In acylation reactions the diacylated products are also formed.