Substituent Effects on the Reactivity of the Silicon−Carbon Double Bond. Substituted 1,1-Dimethylsilenes from Far-UV Laser Flash Photolysis of α-Silylketenes and (Trimethylsilyl)diazomethane
作者:William J. Leigh、Corinna Kerst、Rabah Boukherroub、Tracy L. Morkin、Stephen I. Jenkins、Kuangsen Sung、Thomas T. Tidwell
DOI:10.1021/ja984277z
日期:1999.5.1
nm) laser flash photolysis of the compounds in hydrocarbon solution affords transients which are formed during the ∼20 ns laser pulse and are assignable to the silenes on the basis of their UV absorption spectra and reactivity toward alcohols. 1,1,2-Trimethylsilene has also been generated by laser flash photolysis of (trimethylsilyl)diazomethane and -diazirine in hexane and acetonitrile solution, and
(三甲基甲硅烷基)-、双(三甲基甲硅烷基)-和五甲基二硅烷基乙烯酮在脂肪醇存在下在烃溶液中的光解提供了烷氧基硅烷,以防止硅烯反应性中间体的捕获。silene(1,1,2-trimethylsilene, 1,1,2-trimethyl-2-(trimethylsilyl)silene, and 1,1-二甲基-2-trimethylsilene)可以看作是[1,2]-的产物通过乙烯酮的光脱羰形成的甲硅烷基卡宾中的甲基或三甲基甲硅烷基迁移,尽管不能排除竞争性直接激发态途径。碳氢化合物溶液中化合物的远紫外 (193 nm) 激光闪光光解提供了在 ~20 ns 激光脉冲期间形成的瞬变,并且可根据它们的紫外吸收光谱和对醇的反应性将其归类为 silene。1,1,