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我们曾报导了2,3-二氰基-2,3-二苯基丁二酸二乙酯的分子结构,并对该化合物对烯烃单体进行自由基聚合的引发作用,热分解动力学和固态变温ESR谱等进行了研究。为了进一步探讨这类新型引发剂的结构与性能间的关系,我们继续用X射线衍射方法研究了2,3-二氰基-2,3-二(对-硝基苯基)丁二酸二乙酯的两种异构体1和2的分子结构和晶体结构。并讨论了分子中空间立体效应和电子效应对该化合物稳定性的影响。实验异构体1从乙酸乙酯和四氯化碳(9∶1,V/V)混合溶剂中重结晶,在空气中基本稳定。
We have reported the molecular structure of 2,3-dicyano-2,3-diphenylbutanedioic acid diethyl ester and the initiating effect of the compound on the polymerization of olefin monomers, the thermal decomposition kinetics and Solid-state temperature ESR spectra were studied. In order to further explore the relationship between the structure and properties of these novel initiators, we continue to investigate the effect of 2,3-dicyano-2,3-di (p-nitrophenyl) succinic acid bis Molecular structure and crystal structure of two isomers 1 and 2 of ethyl ester. The effects of spatial stereoscopic effect and electronic effect on the stability of the compound were also discussed. Experimental isomer 1 was recrystallized from a mixed solvent of ethyl acetate and carbon tetrachloride (9: 1, V / V) and was substantially stable in the air.