The intermediate oxaphosphetenes 2 formed by the novel cycloaddition of the PO group of arylphosphine oxides 1 and the acetylene moiety of DMAD are stabilised by an inverse Wittig reaction to afford the corresponding stabilised phosphonium ylide 3.
芳基膦氧化物 1 的 PO 基团与
DMAD 的
乙炔基团通过新型环加成反应形成的中间
肟 2 通过逆维蒂希反应得到稳定,从而得到相应的稳定膦
酰亚胺 3。