Pyrolysis of methylsilyl phenyl ketones. Formation of silene in the decomposition of an intermediate silaoxetane
作者:Wataru Ando、Akira Sekiguchi
DOI:10.1016/s0022-328x(00)92877-8
日期:1977.6
intramolecular insertion into the CH bond of a silyl-methyl group to give an unstable silaoxetane intermediate. The thermal decomposition of the silaoxetane proceeded by cleavage of both the silicon-carbon and the silicon-oxygen bonds. The scission of the SiC bond gave styrene and an SiO doublebonded intermediate which trimerized to a cyclotrisiloxane. On the other hand, the scission of the SiO bond yielded
甲基甲硅烷基苯基酮热异构化为甲硅烷氧基苯基碳烯,后者分子内插入甲硅烷基甲基的CH键,得到不稳定的硅氧杂环丁烷中间体。硅氧杂环丁烷的热分解通过硅-碳键和硅-氧键的断裂而进行。Si 3 C键的断裂产生苯乙烯和Si 3 O双键中间体,其三聚为环三硅氧烷。另一方面,Si = O键的断裂产生苯甲醛和不稳定的硅酮。后者的中间体是通过与起始的甲硅烷基苯基酮或二苯甲酮发生维蒂希型反应来支持的。