The extent of the asymmetric addition of dialkylzincs to chiral α-siloxyaldehydes is determined by the configuration of the chiral catalyst and not by the chirality of α-siloxyaldehydes, providing either diastereoisomer of mono-protected vicinal diols in high diastereoisomeric excess.
                                    手性α-
硅氧基醛的不对称二烷基
锌加成程度由手性催化剂的构型决定,而非由α-
硅氧基醛的手性决定,从而在高度非对映异构体过剩的情况下提供单保护邻位二醇的两种非对映异构体。