Syntheses of Trisila Analogues of Allyl Chlorides and Their Transformations to Chlorocyclotrisilanes, Cyclotrisilanides, and a Trisilaindane
作者:Kai Abersfelder、David Scheschkewitz
DOI:10.1021/ja711169w
日期:2008.3.1
precursors 5a,b are, in turn, accessible from the reactions of the disilenide Tip2Si=Si(Tip)Li (1), that is, a disila analogue to vinyl anions, with dichlorosilanes R2SiCl2. This novel approach to cyclotrisilanes potentially allows for the facile variation of the substitution pattern and grants access to the first anionic derivatives; while the rearrangement of 5a,b to 6a,b is slow at room temperature and
(氯甲硅烷基)二硅烯 R2(Cl)Si-(Tip)Si=SiTip2 (5a,b: Tip = 2,4,6-iPr3C6H2, a: R = Me, b: R = Ph) 的重排定量产生异构体氯环丙硅烷 (6a,b)。二硅烯前体 5a、b 又可从二硅烯化物 Tip2Si=Si(Tip)Li (1)(即乙烯基阴离子的二硅油类似物)与二氯硅烷 R2SiCl2 的反应中获得。这种环丙硅烷的新方法可能允许取代模式的轻松变化,并允许访问第一个阴离子衍生物;虽然 5a,b 到 6a,b 的重排在室温下很慢并且另外需要存在 THF 或其他正供体,但用锂还原 5b 会立即产生相应的环三硅烷 (7b),而没有检测到任何开链异构体. 将 5b 的纯样品加热到 150 摄氏度,提供了完全表征的 1,2,3-三硅烷衍生物 (13),强烈支持插入苯基取代基的邻 CH 键的二硅烷基亚甲硅烷基物种的中间体。对 6a、b