作者:Chandrasekhar Vavilala、Neal Byrne、Christina M. Kraml、Douglas M. Ho、Robert A. Pascal
DOI:10.1021/ja803413f
日期:2008.10.15
6-trichlorophenyl)-1H-indene], and even for the parent hydrocarbon 1,2-bis(phenylethynyl)benzene, the formation of C1-C5 cyclization products is competitive with the major Bergman reaction. Although some C1-C5 cyclization products are probably formed by transfer hydrogenation from 1,4-cyclohexadiene (commonly included in such reactions), thermolyses in the absence of 1,4-CHD as well as deuterium labeling
BLYP/6-31G(d) 水平的计算研究(由 BCCD(T)/cc-pVDZ 计算补充)表明,在芳基取代的 1,2-二乙炔基苯中,空间效应不利于热 C1-C6 双自由基环化反应( Bergman)和电子效应有利于区域变异的 C1-C5 环化,以至于 C1-C5 过程应成为此类化合物热解中的重要反应途径。实验上,1,2-双(2,4,6-三氯苯乙炔基)苯的热解,一种特别有利的情况,仅产生源自 C1-C5 环化的产物 [特别是 1-(2,4,6-三氯苯亚甲基)-2 -(2,4,6-三氯苯基)-1H-茚及其加氢产物3-(2,4,6-三氯苄基)-2-(2,4,6-三氯苯基)-1H-茚],甚至对于母烃 1,2-双(苯乙炔基)苯,C1-C5 环化产物的形成与主要的 Bergman 反应竞争。虽然一些 C1-C5 环化产物可能是通过 1,4-环己二烯(通常包括在此类反应中)的转移氢化形成的,但在没有 1