Photochemical Reactions. 153th communication. Photochemistry of acylsilanes: Photolyses and thermolyses of ?,?-epoxy silyl ketones
作者:Markus E. Scheller、Bruno Frei
DOI:10.1002/hlca.19920750105
日期:1992.2.5
The photolyses and thermolyses of the α,β-epoxy silyl ketones 5 and 6 are described. On n,π*-excitation, the silyl ketones 5 and 6 were transformed to the ketone 7 and the ketene 8 in quantitative yield. The formation of 8 may be explained by initial cleavage of the C(α)O bond and subsequent C(1)C(2) migration of the (t-Bu)Me2Si group. In contrast to the acylsilanes 5 and 6, the photolyses of the analogous
描述了α,β-环氧甲硅烷基酮5和6的光解和热解。在n,π*激发下,甲硅烷基酮5和6以定量收率转化为酮7和烯酮8。8的形成可以通过(t -Bu)Me 2 Si基团的C(α)O键的初始裂解和随后的C(1)C(2)迁移来解释。与酰基硅烷5和6相比,类似的甲基酮11和12的光解产生了非常复杂的产物混合物。热解时,51和6生成的酮7和炔属化合物9,可能是通过甲氧碳烯中间体形成的。另外,通过最初的C(α)C(β)键裂解形成叶立德g并随后在分子内加成羰基形成1,3-二氧杂环己烷10。通过甲基酮11和12的热解获得类似的1,3-二恶唑13。