Regioselective dinitration of simple aromatics over zeolite Hβ/nitric acid/acid anhydride systems
作者:Keith Smith、Mohammad Hayal Alotaibi、Gamal A. El-Hiti
DOI:10.3998/ark.5550190.p008.527
日期:——
Various nitration systems comprising nitric acid, acid anhydride and zeolite Hβ in the absence of solvent are described. Direct double nitration of toluene with a nitric acid, propanoic anhydride and zeolite H system has been developed to give 2,4-dinitrotoluene in 98% yield, with a 2,4:2,6-dinitrotoluene ratio of 123:1. This system also nitrates activated mono-substituted benzenes (anisole and phenetole)
描述了在不存在溶剂的情况下包含硝酸、酸酐和沸石Hβ的各种硝化系统。已经开发出甲苯与硝酸、丙酸酐和沸石 H 系统的直接双硝化,以 98% 的产率得到 2,4-二硝基甲苯,2,4:2,6-二硝基甲苯的比例为 123:1。该系统还硝酸盐活化的单取代苯(苯甲醚和苯乙醚)和适度活化的单取代苯(乙苯和丙苯),主要生成 2,4-二硝基衍生物。沸石可以回收、再生和再利用,其产率与使用新鲜沸石时的产率几乎相同。