REACTION OF 9-GERMAPHENANTHRENE WITH DIMETHYL ACETYLENEDICARBOXYLATE: UNEXPECTED FORMATION OF A 1,2-OXAGERMOLANE DERIVATIVE

摘要

The reaction of 9-germaphenanthrene with dimethyl acetylenedi-carboxylate (DMAD) in benzene afforded a 1:2 adduct containing 1,2-oxa-germolane and cyclopentadiene units, the structure and generation mechanism of which are discussed based on X-ray structural analysis and theoretical calculations.