β-Lithiooxyphosphonium ylides, generated in situ from aldehydes and methylenetriphenylphosphorane, react with halomethyl esters to form disubstituted allylic esters in good yields and with high Z-selectivity.
由醛和亚甲基
三苯基膦原位生成的β-
锂氧
磷鎓叶立德,可与卤甲基酯反应,以良好的产率和高度选择性地形成Z型二取代烯丙基酯。