作者:Hubertus Appler、Wilhelm P. Neumann
DOI:10.1016/0022-328x(86)80390-4
日期:1986.10
-4 (XI), however, yields the known silirene XII (2,2,6,6,8,8-hexamethyl-8-sila-4-thia-bicyclo[5.1.0Δ1.7]octane); its transformation to the 1,4-disila-cyclohexadiene is prevented by steric effects. Thermally stable, 1,3-dienes give, depending on their substitution pattern, 1-sila-cyclopentenes-2 or -3. A mechanism is proposed giving the observed products via an initial 1,2-addition.
苯基化的炔烃与热生成的Me 2 Si(200°C)形成1,4-二硅氢环己二烯(VIII-X )。庞大的取代基(CMe 3,SiMe 3)阻止添加。然而,应变的环炔烃3,3,6,6-四甲基-1-硫杂-环庚炔4(XI)产生了已知的甲硅烷基XII(2,2,6,6,8,8-六甲基-8-sila -4-thia-bicyclo [ 5.1.0Δ1.7 ]辛烷); 通过空间效应阻止了其向1,4-二硅氢环己二烯的转化。根据其取代方式,热稳定的1,3-二烯生成1-sila-cyclopentenes-2或-3。提出了一种通过初始的1,2-加法给出所观察到的产物的机制。