The Benzylidenecarbene–Phenylacetylene Rearrangement: An Experimental and Computational Study
作者:Kathryn A. Moore、Jesus S. Vidaurri-Martinez、Dasan M. Thamattoor
DOI:10.1021/ja310440e
日期:2012.12.12
Benzylidenecarbene was generated from a new photochemical source, 1-benzylidene-1a,9b-dihydro-1H-cyclopropa[l]phenanthrene, in deuterated benzene at ambient temperature. The carbene undergoes a facile rearrangement to phenylacetylene and could not be trapped by olefins. Generation of the carbene bearing a (13)C label at the β-carbon produced phenylacetylene in which the label was found exclusively
苄叉卡宾是在环境温度下在氘代苯中由一种新的光化学来源 1-benzylidene-1a,9b-dihydro-1H-cyclopropa[l] 菲生成的。卡宾容易地重排为苯乙炔并且不能被烯烃捕获。在 β-碳上带有 (13)C 标记的卡宾的生成产生了苯乙炔,其中仅在与苯环相邻的碳上发现了标记。这种对 H 偏移的压倒性偏好与 B3LYP 和 CCSD(T) 计算一致。然而,在这项工作中观察到的标签分布与之前报道的高温快速真空热解结果形成对比,其中卡宾和炔烃的相互转化导致两个炔基 (sp) 碳上的标签混乱。