<i>t</i>-BuONa-mediated direct C–H halogenation of electron-deficient (hetero)arenes
作者:Xia Liu、Xin Zhao、Fushun Liang、Baoyi Ren
DOI:10.1039/c7ob03081a
日期:——
An efficient halogenation of electron-deficient (hetero)arenes is described. The reaction utilizes common t-BuONa as a catalyst (for iodination) or a promoter (for bromination and chlorination), and perfluorobutyl iodide, CBr4 or CCl4 as the readily-available halogenating agents, respectively. The protocol features broad scope, high efficiency, mild conditions and gramscalability. An ionic pathway
Propane has been found to alkylate pentafluorobenzene in the presence of aprotic organic superacids CBr4·nAlBr3 (n = 1 or 2) in CH2Br2 solution at 0°, giving C6F5Pri (1) in almost quantitative yield. In the absence of propane at the 20°, pentafluorobenzene reacts with CBr4·2AlBr3 to form C6F5CBr3 in 40 % yield.