With sulphur at ca. 140 °C in xylene, 4,5-dimethyl-2-phenylphosphinine gives a transient P-sulphide which reacts with 2,3-dimethylbutadiene as a dienophile through its 1,6 positions and with dimethyl acetylenedicarboxylate as a diene through its 1,4 positions.
含
硫约。在二
甲苯中的140°C下,4,5-二甲基-2-苯基次膦生成一个瞬态P-
硫化物,它通过1,6位与作为亲二烯体的
2,3-二甲基丁二烯反应,并通过其1,4与作为二烯的
乙炔二
羧酸二甲酯反应职位。