Hydrogenolysis reactions of some polychlorinated norborn-2-enes, and the synthesis of 1,4-dichloronorborn-2-ene
作者:C. K. Alden、D. I. Davies
DOI:10.1039/j39680000700
日期:——
Hydrogenolysis of the Diels–Alder adducts from the reactions of tetrachlorocyclopentadiene with trans-1,2-dichloroethylene and vinyl chloride results in removal of their chlorine-substituted double bonds. 1,4-Dichloronorborn-2-ene was synthesised by the elimination of chlorine from 1,2-exo,3-endo,4-tetrachloronorbornane when treated with magnesium and iodine, and by base-catalysed elimination of hydrogen chloride
在氢氧化钾存在下,在阮内镍上对1,2,3,4,7,7-六氯降冰片-2-烯进行氢解,通过中间体1,2,3,4,7生成1,4,7-三氯降冰片烷-顺式-五氯降冰片-2-烯。当使用10%钯-木炭作为催化剂时,除非存在5-内-氯取代基,否则C-7氯原子是惰性的,例如1,2,3,4,5-内,7,7-七氯降冰片烯中2-烯。四氯环戊二烯与反式-1,2-二氯乙烯和氯乙烯反应产生的狄尔斯-阿尔德加合物发生氢解反应,从而除去了其氯取代的双键。通过从1,2-外,3-内消去氯来合成1,4-二氯降冰片-2-烯镁和碘处理后,通过碱催化从1,2-外生的,4-三氯降冰片烷中除去氯化氢,得到1,4-四氯降冰片烷。