form a radical ion pair followed by addition of oxygen. Interestingly, a remarkable solvent effect was observed in the product ratio of dioxadisilin 2 and oxadisilolene 3 as a monooxygenated product. The solvent acetonitrile, acting as a nucleophile, participates for predominant formation of 2. Meanwhile, in the absence of acetonitrile, 3 was afforded as a major product. The conceivable mechanism is proposed
3-苯基-1,1,2,2-四甲基-1,1,2-二
甲苯-3-烯(1)在
乙腈-
二氯甲烷中的光诱导电子转移加氧,得到相应的1,2-二氧杂-3,6 -二disinin(2)作为双氧插入产物与1-oxa-2,5-disilolene(3)的双氧插入产物,产率适中。通过将电子转移二
硅杂
环丁烯1变为敏化剂的激发单重态以形成自由基离子对,然后添加氧,可以合理地解释该结果。有趣的是,在二恶
戊二烯2和恶二
丙烯3的产物比率中观察到了显着的溶剂作用。作为单氧化产物。
乙腈作为亲核试剂,主要参与2的形成。同时,在不存在
乙腈的情况下,提供了3作为主要产物。提出了可能的机制。