Abstract: Treatment of tris (diethy1amino) phenoxyphosphonium chloride (Ia) and tris (diethy1amino)-p-methoxy-phenoxyphosphonium chloride (Ha) with lithium diethylamide in benzene-hexane led to the rearranged betaines (111 and VI). The structures of these materials were demonstrated by alternate syntheses of derivatives of them. Treatment of the hexafluorophosphate (Ib) in benzene-hexane and hexane alone with lithium diethylamide ...