Conical Intersection Control of Heterocyclic Photochemical Bond Scission<sup>1</sup><sup>,</sup><sup>2</sup>
作者:Howard E. Zimmerman、Oleg D. Mitkin
DOI:10.1021/ja061851v
日期:2006.10.1
alone leads to a zwitterionic intermediate which can be trapped by nucleophiles, while cleavage of bonds a and b together affords two fragments--a ketene and an imine. The ketene could be intercepted with nucleophiles and the imine trimerized. Computation reveals little weakening of bonds a and b. But as stretching begins, conical intersections are encountered, leading to ground-state products.
杂环 5,6-dihydro-1-methyl-5,5-diphenylpyridin-2(1H)-one(本文中的化合物 1)的光化学导致两个竞争反应(反应在文章引言中描述) )。这些产生于氮 (N-6) 和 C-1 之间的键 a 和与两个苯基取代基的 C-4 和与氮相邻的 C-5 之间的键 b 的裂变。单独的键 a 断裂会导致可被亲核试剂捕获的两性离子中间体,而键 a 和 b 一起断裂会产生两个片段——乙烯酮和亚胺。乙烯酮可以被亲核试剂拦截,亚胺三聚。计算表明键 a 和 b 几乎没有减弱。但是当拉伸开始时,会遇到锥形交叉点,导致基态产物。