中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | (Brommethyl)tri-tert-butylsilan | 67382-53-0 | C13H29BrSi | 293.363 |
1-溴乙基(三叔丁基)硅烷 | Tri-tert-butyl(1-bromethyl)silan | 89200-86-2 | C14H31BrSi | 307.39 |
—— | Tri-tert-butyl(1,2-dibromethyl)silan | 89200-89-5 | C14H30Br2Si | 386.286 |
—— | tri-tert-butylisopropylsilane | 84627-97-4 | C15H34Si | 242.52 |
—— | Tri-tert-butylethylsilan | 89200-88-4 | C14H32Si | 228.494 |
The generation of silaethenes Me2Si=CH(SiMe3) (1), Me2Si=CH(SitBu3) (2), tBuMeSi=CH(SitBu3) (3), and tBu2Si=CH2 (4) from metal organyls >SiX-CM< (X = Br, F; M = Na, Li) by elimination of MX is investigated. The metal organyls are prepared from >SiX-CBr< and RM (R = tBu3Si, nBu, Ph) by Br/M exchange (for preparation of >SiX-CBr< cf. Scheme 1). Only the sterically overcrowded silaethenes 2 and 3. generated from Me2SiF-CHNa(SitBu3) and tBuMeSiF-CHNa(SitBu3), have been identified by trapping with isobutene and dimethylbutadiene under formation of ene and Diels-Alder adducts. Analogous products are not found from Me2SiBr-CHNa(SiMe3) and tBu2-SiBr-CH2-Li. In the absence of trapping agents, compounds 1, 2, and 3 form cyclodimers. A reaction intermediate of the formation of 1 × 1 has been isolated and the structures of 2 × 2 and 3 × 3 have been solved by X-ray analysis. No dimer is observed for 4. In this case compounds are formed which may be interpreted as insertion products of 4 into the CLi bond of the precursor.