Abstract
2α-Chloro(or bromo)-5β-chloromethyl(or bromomethyl)-5α-methyl-2β-oxo-1,3,2-dioxaphosphorinan reacts with piperidine to yield 5β-chloromethyl(or bromomethyl)-5α-methyl-2-oxo-2-piperidino-1,3,2-dioxaphosphorinan. N-Chloropiperidine reacts with 4-methyl-2,6,7-trioxa-1-phosphabicyclo[2,2,2]octane to give 5α-chloromethyl-5β-methyl-2α-oxo-2β-piperidino-1,2,3-dioxaphosphorinan. The existence of the two conformers of 5,5-dimethyl-2-oxo-2-piperidino-1,3,2-dioxaphosphorinan is suggested.

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