Synthesis and Reaction of the First 1,2-Oxaphosphetane Complexes

摘要

While P~V 1,2-oxaphosphetanes are well known from the Wittig reaction, their P~(-1) analogues are still unexplored. Herein, the synthesis and reactions of the first 1,2-oxaphos-phetane complexes are presented, which were achieved by reaction of the phosphinidenoid complex [Li(12-crown-4)-(solv)][(OC)5W{(Me3Si)2HCPCl}] with different epoxides. The title compounds appeared to be stable in toluene up to 100°C, before unselective decomposition started. Acid-induced ring expansion with benzonitrile resulted in selective formation of the first complex bearing a l,3,4-oxazaphosphacyclohex-2-ene ligand.