A practical approach to the synthesis of antioxidant 4,4′-dicumyldiphenylamine (DCDPA) and its derivatives by Friedel–Crafts alkylation of aromaticamines was developed under continuous flow conditions. Because of the enhanced mass and heat transfer features of the microreactor, the reaction time was significantly reduced in contrast to a batch mode. The reaction was carried out using a 1:6 v/v ethanol/Cl(CH2)2Cl
在连续流动条件下,开发了一种通过芳族胺的Friedel-Crafts烷基化合成抗氧化剂4,4'-二枯基二苯胺(DCDPA)及其衍生物的实用方法。由于微反应器的质量和传热特性增强,与分批模式相比,反应时间大大缩短。使用1:6 v / v乙醇/ Cl(CH 2)2 Cl共溶剂系统,以ZnCl 2作为催化剂进行反应,以得到令人满意的产率。这是一种有效的合成DCDPA及其衍生物的方法,具有优异的对位选择性,具有反应时间短,操作简便和直接放大的优点。
Anti-Bredt di(amino)carbene supported gold(I) chloride complexes are readily prepared in two steps from the corresponding isocyanide complexes. In the presence of KB(C6F5)(4) as chloride scavenger, they promote the unprecedented hydroarylation reaction of alkenes with N,N-dialkylanilines with high para-selectivity. The latter are challenging arenes for Friedel-Craft reactions, due to their high basicity.
Experimental and theoretical study on the cyclic(alkyl)(amino)carbene-copper catalyzed Friedel–Crafts reaction of <i>N</i>,<i>N</i>-dialkylanilines with styrenes
作者:Wentao Ma、Gaowen Zhai、Xingbang Hu、Youting Wu
DOI:10.1039/c9ob02734c
日期:——
The Friedel–Craftsreaction of alkalinous substrates is challenging because of the coordination between amines and traditional acid catalysts. Based on theoretical research, we designed a catalytic process for the Friedel–Craftsreactions of N,N-dialkylanilines in the presence of CAAC-CuCl [CAAC = cyclic(alkyl)(amino)carbene] and KB(C6F5)4. Experimental results show that the catalytic system is suitable
由于胺和传统酸催化剂之间的配位,碱性底物的弗里德尔-克来福特反应具有挑战性。基于理论研究,我们设计了在CAAC-CuCl [CAAC =环(烷基)(氨基)卡宾]和KB(C 6 F 5)4存在下N,N-二烷基苯胺的Friedel-Crafts反应的催化方法。。实验结果表明,该催化体系适用于一系列N,N-二烷基苯胺和苯乙烯,并具有良好或优异的对选择性产物收率。结果与在卡宾-金催化过程中获得的结果相当。