Benzaldehyde N,N-Dimethylhydrazone in the Reaction with 4-Oxo-2-pentafluorophenoxy-5,6-benzo-1,3,2-dioxaphosphorinane. Preparation and Spatial Structure of 4-Dimethylamino-2,5-dioxo-2-pentafluorophenoxy-3-phenyldihydro-6,7-benzo-1,4,2-oxazaphosphepine

摘要

Benzaldehyde N,N-dimethylhydrazone with 4-oxo-2-pentafluorophenoxy-5,6-benzo-1,3,2-dioxaphosphorinane is capable to yield with high stereoselectivity a product of the phosphorus heterocycle expansion: unstable to hydrolysis 4-dimethylamino-2,5-dioxo-2-pentafluorophenoxy-3-phenyldihydro-6,7-benzo-1,4,2-oxazaphosphepine. The onfiguration of the prevailing isomer of the latter was determined by X-ray diffraction study.