Free-radical reactions of halogenated bridged polycyclic compounds. Part IX. The addition of methanethiol and bromotrichloromethane to 1,4,7,7-tetrachloronorborn-2-ene, and of bromotrichloromethane to some chlorine-substituted norbornadienes
作者:D. I. Davies、P. J. Rowley
DOI:10.1039/j39690000424
日期:——
7-hexachloronorborna-2,5-diene and 1,4,7,7-tetrachloro-2,3-bismethylthionorborna-2,5-diene. These results are interpreted as demonstrating that in the addition of free radical reagents to chlorine-substituted norbornadienes and norbornenes, the direction of radical attack, and hence the product structures, are controlled primarily by electronic rather than steric factors. The synthesis of 1,4,7,7-tetrachloronorborn-2-ene
将甲硫醇加到1,4,7,7-四氯降冰片-2-烯中得到1,4,7,7-四氯降冰片-2-内基甲基硫化物,它是由甲硫基自由基的内攻击形成的。溴代三氯甲烷的加入产生了由三氯甲基自由基的exo攻击而得到的3-内-溴-1,4,7,7-四氯-2-外-三氯甲基降冰片烷。源自同类产品外型由三氯甲基自由基攻击形成在除了三氯甲烷对1,2,3,4,7-反-pentachloronorborna-2,5-diene和1,2,3,4-tetrachloronorborana-2,5-diene,也很可能是1,2,3,4,7,7-hexachloronorborna-2,5 -二烯和1,4,7,7-四氯-2,3-双甲基硫代降冰片-2,5-二烯。这些结果被解释为表明,在向氯取代的降冰片二烯和降冰片烯中添加自由基试剂时,自由基进攻的方向以及因此的产品结构主要受电子而非空间因素控制。据报道,通过1,4,7,7-四氯-2,3-双甲基硫代降冰片烯2