摘要
以N,N-二甲基苯胺为原料,采用吡啶为缚酸剂,通过就地生成体积较大的溴化剂——溴化氢吡啶过溴化物,提高了4-位溴代反应的选择性,4-溴-N,N-二甲基苯胺的收率达到了68%.在一些无机碱存在下,本反应也可以得到中等收率的产品.n(N,N-二甲基苯胺):n(溴):n(吡啶)=1:1.1:1.1、反应温度10~15℃、反应时间为6h是最佳工艺条件.
In presence of pyridine, 4-bromo-N, N-dimethylaniline was synthesized by substitution reaction starting from N, N-dimethylaniline and bromine. In this reaction, the easy handle together with bigger volume brominating agent pyridinium tribromide was produced and the selectivity of 4-substitution reaction was enhanced. The optimal molar ratio was n (C8 H11 N) : n (Br2) : n (C5 H5 N) = 1 : 1.1 : 1.1, the reaction was at 10 - 15 ℃ for 6 h to give the product in 68 % yield. Moreover the products were also obtained in middle yield in presence of some inorganic base.
出处
《河北师范大学学报(自然科学版)》
CAS
北大核心
2008年第4期503-504,507,共3页
Journal of Hebei Normal University:Natural Science
基金
河北省科技攻关项目(07215603D)