The presence of an electron-withdrawing group at the PIII of a phosphanyl phosphonate reagent MesFP(H)P(O)(OEt)2 (see Figure) renders the reductive aldehyde coupling of aldehydes selectively for the thermodynamically less stable Z-olefin product.
膦酰基
膦酸酯试剂 Mes F P(H)P(O)(OEt) 2的 P III上存在吸电子基团(见图)使得醛的还原性醛偶联选择性地用于热力学不太稳定的Z -烯烃产物。