羧酸开环法合成1,1-二氨基-2,2-二硝基乙烯的研究

对2一甲基咪唑为反应底物制备1，1一二氨基一2，2．二硝基乙烯(FOx一7)的合成方法进行了实验研究，找到了一种新的合成FOx．7的方法，该方法首次采用低碳有机羧酸与硝化中间体2一(二硝基亚甲基)．4，5．咪唑烷二酮l的反应实现FOx一7的合成，对产物结构进行了表征并对反应奈件进行了优化。开环试剂为甲酸时，最优条件下两步反应(收率分别为20．3％和95．3％)的总收率约为19．3％，与氨水开环法(约13、1％)相比收率有较大幅度提高，通过控制反应时间和结晶时间可对FOx．7的颗粒度进行控制，同时该方法也是制备大颗粒和不同形貌特征FOx一7的有效方法。对开环反应机理进行了探讨，

Study on Ring Cleavage of 2-(Dinitromethylene)-4,5-imidazolidinyldione to 1,1-Diamino-2,2-dinitroethylene by Carboxylic Acids

1,1-Diamino-2,2-dinitroethylene (FOX-7) was synthesized using 2-methylimidazole as raw material. Ring cleavage of 2-(dinitromethylene)-4,5-imidazolidine dione was achieved by reacting with carboxylic acids, and the reaction conditions were optimized. The overall yield of nitration and ring cleavage was 19.3%(about 13% in literature) when formic acid was used. The ring cleavage by carboxylic acids, methanol, water and aqueous ammonia was compared. The particle size of FOX-7 can be controlled by adjusting the reaction and crystallization time, and it is also an efficient method for the preparation of large particle size FOX-7 with different features. The reaction mechanism of ring cleavage was discussed.