The reaction of some chloride-substituted norbornadienes and norbornenes with sodium thiomethoxide
作者:D. I. Davies、P. J. Rowley
DOI:10.1039/j39690000288
日期:——
comparable degree by both an unsubstituted double bond, and by bridge chlorines. Bridgehead chlorines have less effect on reactivity. The rate-determining step of reaction is likely to be attack by thiomethoxide ions on the chlorine-substituted double bond. The disubstitution product 1,4,7,7-tetrachloro-2,3-dithiomethoxynorborna-2,5-diene derived from hexachloronorbornadiene deteriorates on keeping, for
1,2,3,4,7,7-六氯降冰片-2,5-二烯和相关的降冰片二烯与二氯取代的2,3-双键的反应与硫代甲醇钠在二甲基甲酰胺中的溶剂反应,导致连续取代乙烯基双键氯。相应的1,2,3,4,7,7-六氯降冰片烯-2-烯和相关的降冰片烯反应性较低,并且只有在含有至少一个桥氯的降冰片烯中,才能分离甚至单取代的产物。艾氏剂不反应,并且异狄氏剂产生的单取代产物产率低。竞争性研究表明,未取代的双键和桥式氯在相当程度上有助于乙烯基氯的替代。桥头氯对反应性的影响较小。反应的速率确定步骤很可能会受到氯代双键上的硫代甲醇离子的攻击。衍生自六氯降冰片二烯的分解产物1,4,7,7-四氯-2,3-二硫甲氧基降冰片烯2,5-二烯在保存超过2周后变质,得到1,4,7,7-四氯-2 ,3,5-内-三硫代甲氧基norborn-2-ene。该化合物也是在氯化氢催化的1,4,7,7-四氯-2,3-二硫代甲氧基降冰片2,5-二烯的甲