申请人:IMI (TAMI) INSTITUTE FOR RESEARCH & DEVELOPMENT LTD.
公开号:EP0558857A1
公开(公告)日:1993-09-08
Para-bromodimethyl aniline of a high purity at high yields is obtained by the direct bromination of N,N'-dimethyl aniline with bromine in the presence of a solvent. The temperature which prevails during the reaction may be up to the reflux of the solvent used. The solvent consists of at least one halogenated hydrocarbon having the formula RXn wherein: R is a straight or branched aliphatic hydrocarbon having 1 to 12 carbon atoms, X is bromine or chlorine and n is between 1 and 4, with the proviso that when n is 4, the solvent is CCl₄.
通过在溶剂存在下使用溴直接对N,N'-二甲基苯胺进行溴化反应,可以得到高纯度的对溴二甲基苯胺,并且产率较高。反应过程中所处的温度可以达到所使用的溶剂的沸点。所使用的溶剂至少包含一个具有RXn式的卤代烃,其中:R是具有1到12个碳原子的直链或支链脂肪烃,X为溴或氯,n为1到4之间,但当n为4时,溶剂为CCl₄。