Pb(ONOQ)2. Reaction of PhSiMeCl2 takes place with high kinetic stereoselectivity to produce isomer Ph(Cl)Si(ON[Me]O) in which the phenyl is axial in the trigonal bipyramid, which subsequently isomerizes to the thermodynamic isomer with axial chlorine. This indicates that migration takes place preferentially from the stereoisomer of the octahedral intermediate, κ3-Ph(CH3)(Cl)Si(ONOQ), in which the phenyl and
                                    据报道,
氯硅烷R(X)(Y)SiCl(R = Me,Ph; X,Y = Me,Ph,Cl)与Pb(ONO Q)2(ONO Q = 3,5-二叔丁基-丁基-1,2-醌-(3,5-二叔丁基-2-氧基-1-苯基)
亚胺)得到五配位的(X)(Y)Si(ON [R] O),在R基团已经从
硅迁移到氮。如(CH 3)3 SiCl和(CD 3)3 SiCl在与Pb(ONO Q)2的反应中没有交叉的现象所证实,这种迁移是分子内的。PhSiMeCl 2的反应发生具有高动力学立体选择性的反应,以生产异构体Ph(Cl)Si(ON [Me] O),其中苯基在三角双锥体中呈轴向,随后与轴向
氯异构化为热力学异构体。这表明发生迁移优先从八面体中间,κ的立体异构体3 -Ph(CH 3)(Cl)的
硅(ONO Q),其中的苯基和甲基是相互反式的,这表明观察到的甲基对苯基迁移的完全选择性是由于迁移能力的内在差异引起的。DFT计算表