4-Benzoyl-N-methylpiperidine

A similar study of 4-methyl-4-benzoyl-N-methylpiperidine provided comparable results and the important conclusion that no charge-transfer quenching of the triplet ketone occurs as it does with acyclic y-amino ketones, proving that the charge transfer does not occur through bonds but requires close through space contact. ... 

Enantiomerically pure dipeptide is obtained when the 4-nitrophenyl ester of N-benzoyl-L-leucine is coupled with ethyl glycinate in ethyl acetate. If, however, the leucine ester is treated with 1-methylpiperidine in chloroform for 30 min prior to coupling, the dipeptide in nearly completely racemized. Treatment of the leucine ester with 1-methylpiperidine leads to formation of a crystalline material of composition C13H15NO2, which has strong IR bands at 1832 and 1664 cm Explain how racemization occurs and suggest a reasonable structure for the crystalline material. 

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