Diels-Alder Reaction of 2-Substituted Tropones with Ethylene. HMO Level Aspect of the Regioselectivity
作者:Tadao Uyehara、Yoshio Kitahara
DOI:10.1246/bcsj.52.3355
日期:1979.11
2-Chloro-, 2-methoxy-, 2-phenyl-, and 2-methyltropones (2,4,6-cycloheptatrien-1-ones) and benzoate of tropolone (2-hydroxy-2,4,6-cycloheptatrien-1-one) reacted with ethylene affording Diels-Alder type 1,4-addition products, bicyclo[3.2.2]nona-3,6-dien-2-ones. The regioselectivities of the cycloaddition are quite random, while they are reproduced by the calculated interaction energies based on Salem’s PMO equation which includes the closed-shell repulsion term.
2-氯、2-甲氧基、2-苯基和2-甲基托苯酮(2,4,6-环庚三烯-1-酮)以及托苯醇的苯甲酸酯(2-羟基-2,4,6-环庚三烯-1-酮)与乙烯反应,生成了Diels-Alder类型的1,4-加成产物,双环[3.2.2]壬-3,6-二烯-2-酮。环加成的区位选择性相当随机,但通过基于Salem的PMO方程计算的相互作用能可以再现这种选择性,方程中包含了闭壳层排斥项。