Dimere der Ethene Me2EC(SiMe3)2 (E=Si, Ge, Sn): Auf welchem Wege entstehen sie aus Me2EXCM(SiMe3)2? Wie sind sie strukturiert?
作者:N. Wiberg、T. Passler、S. Wagner、K. Polborn
DOI:10.1016/s0022-328x(99)00727-5
日期:2000.4
(e.g. pentane, diethyl ether, tetrahydrofuran) (i) by a very fast Br/M exchange into the ‘metalation products’ Me2EXCM(SiMe3)2, which thermolyze under formation of ‘cyclobutanes’ [Me2EC(SiMe3)2]2, and (ii) to a lesser extent by X/R exchange into ‘substitution products’ Me2ERCBr(SiMe3)2. As shown by trapping experiments, the unsaturated compounds Me2EC(SiMe3)2 play the role of short-lived intermediates
碱金属有机基甲硅烷基或MR(例如石灰,李Ñ卜,李吨卜,LIPH,使用LiCH(森达3)2,LIC(森达3)3,的NaSi吨卜3)转换等摩尔量的bromomethanes我2 EXCBr( SiMe 3)2在有机溶剂(例如戊烷,乙醚,四氢呋喃)中通过E = Si,Ge,Sn和带负电的取代基X(例如F,Br,OPh)(i)通过非常快的Br / M交换成'金属化的产品我2 EXCM(森达3)2,其下形成的thermolyze '环丁烷'[Me 2 EC(森达3)2 ] 2,和(ii)由X / R交换进入'取代产物'我在较小程度上2 ERCBr(森达3)2。如图所示通过捕获实验中,不饱和化合物我2 EC(森达3)2播放在上述两个反应短命中间体的作用。它们是从我形成2 EXCM(森达3)2由MX消除和Me添加本碱金属化合物2(森达EXCM 3)2 ≡MR'或MR,分别。该产品我2 ER'CM(森达3)2与R'=