作者:Kenichi Somekawa、Taku Matsuo、Sanetada Kumamoto
DOI:10.1246/bcsj.42.3499
日期:1969.12
2,3,4,5,6,6-Hexachloro-, 2,3,4,6,6-pentachloro-, and 2,4,6,6-tetrachloro-2,4-cyclohexadienones were found to undergo Diels-Alder reactions when the compounds were heated with such dienophiles as acrylic acid, methyl acrylate, methyl vinyl ketone, acrylonitrile, and ethyl vinyl ether. It was concluded, chiefly through analysis of these NMR spectra, that the reactions proceed stereospecifically to give a series of 7-substituted and polychlorinated bicyclo-[2.2.2] oct-5-en-2-ones, which is in agreement with the endo rule. The stereospecificity of these adducts does not, however, agree with the results of calculations by means of the perturbation method.
研究发现,当 2,3,4,5,6,6-六氯-、2,3,4,6,6-五氯-和 2,4,6,6-四氯-2,4-环己二烯酮与丙烯酸、丙烯酸甲酯、乙烯基甲酮、丙烯腈和乙烯基乙醚等亲二烯化合物加热时,这些化合物会发生 Diels-Alder 反应。主要通过分析这些核磁共振波谱得出的结论是,这些反应具有立体特异性,生成了一系列 7-取代和多氯双环-[2.2.2] 辛-5-烯-2-酮,这与内切规则是一致的。不过,这些加合物的立体特异性与扰动法的计算结果并不一致。