An efficient in situ prepared superacid BF3–H2O promoted benzylation of arenes using benzyl alcohols and acetates achieves various diarylalkanes.
一种高效的原位制备的超强酸BF3-H2O促进的芳烃苄基化反应,使用苄醇和醋酸酯制备各种二芳基烷烃。
Benzylation of arenes with benzyl ethers promoted by the in situ prepared superacid BF3–H2O
作者:Yu Li、Yan Xiong、Xueming Li、Xuege Ling、Ruofeng Huang、Xiaohui Zhang、Jianchun Yang
DOI:10.1039/c4gc00005f
日期:——
An efficient and environmentally friendly benzylation of arenes with benzyl ethers as benzyl donors using BF3âEt2O to generate in situ the superacid BF3âH2O as an efficient promotor has been described. A wide variety of functional groups have been investigated and found to be compatible to give the desired diarylmethanes in yields of up to 99%. The crucial role of the moisture content in this transformation has been demonstrated by detailed investigations.
The Friedel–Craftsbenzylation of arenes using benzyl alcohols activated in situ with XtalFluor-E is described. A wide range of 1,1-diarylmethanes and 1,1,1-triarylmethanes were prepared under experimentally simple and mild conditions, without the need for a transition metal or a strong Lewis acid. Notably, the reactivity observed demonstrates the potential of XtalFluor-E to induce C–OH bond ionization
描述了使用用XtalFluor-E原位活化的苯甲醇对芳烃进行的Friedel-Crafts苄基化。在实验上简单温和的条件下,无需过渡金属或强路易斯酸,即可制备各种1,1,1-二芳基甲烷和1,1,1-三芳基甲烷。值得注意的是,观察到的反应性表明XtalFluor-E可能诱导苄醇的C-OH键电离和S N 1反应性。
Iron(iii)-based ionic liquid-catalyzed regioselective benzylation of arenes and heteroarenes
作者:Jian Gao、Jin-Quan Wang、Qing-Wen Song、Liang-Nian He
DOI:10.1039/c1gc15056a
日期:——
Lewis acid ionic liquid ([C4mim][FeCl4]), being comprised of 1-butyl-3-methyl imidazolium cation and tetrachloroferrate anion, was found to be an efficient, recyclable catalyst for benzylation of various arenes/heteroarenes into the diarylmethanes derivatives under mild reaction conditions without utilization of additional organic solvent. Interestingly, the acidity of [C4mim][FeCl4] could account for
Simple and efficient procedure for alkylation of aromatics from alcohols in the presence of NaHSO4/SiO2 was developed. Various triaryl methanes were obtained in good yields in short reaction time. For instance the reaction of mesitylene with benzhydrol in the presence of NaHSO4/SiO2 gave the corresponding triaryl methane in a quantitative yield. NaHSO4/SiO2 was regenerated by simple treatment and could