卤代乙酸乙酯与活性聚丁二烯基锂反应机理的研究

A Study on the Reaction Mechanism between Ethyl Halogen Acetate and Polybutadienyllithium

以有机锂为引发剂,丙酮苯甲醛或1,1-二苯基乙烯为戴帽剂,卤代乙酸乙酯为终止剂,研究了卤代乙酸乙酯与聚丁二烯基锂或其它各种戴帽(Capping)的活性聚丁二烯的反应,并提出了相应的反应机理。试验结果表明,卤代乙酸乙酯与聚丁二烯基锂发生偶联反应,但当用戴帽剂时,可以避免偶联反应,并得到端α-氯乙酰基聚丁二烯。

Using organic lithium as initiator,acetone,benzaldehyde or 1,1-diphenyle-thylene as“capping agent”,and ethyl halogen acetate as terminator,the reactionsbetween ethyl halogen acetate and polybutadienyllithium and other capped livingpolybutadienes have been investigated and the corresponding mechanisms pro-posed.The experimental results show that coupling reactions occur between ethylhalogen acetate and polybutadienyllithium.When “capping agents” are used,thecoupling reactions can be avoided and polybutadi(?)ne with chloroacetyl end-groupare obtained.