Diarylmethane synthesis through Re<sub>2</sub>O<sub>7</sub>-catalyzed bimolecular dehydrative Friedel–Crafts reactions
作者:Qi Qin、Youwei Xie、Paul E. Floreancig
DOI:10.1039/c8sc03570a
日期:——
describes the application of Re2O7 to the syntheses of diarylmethanes from benzylic alcohols through solvolysis followed by Friedel–Craftsalkylation. The reactions are characterized by broad substrate scope, low catalyst loadings, high chemical yields, and minimal waste generation. The intermediate perrhenate esters are superior leaving groups to chlorides and bromides in these reactions. The polarity
该手稿描述了 Re 2 O 7在通过溶剂分解和弗里德尔-克来福特烷基化从苯甲醇合成二芳基甲烷中的应用。该反应的特点是底物范围广、催化剂负载量低、化学产率高和废物产生最少。在这些反应中,中间体高铼酸酯是优于氯化物和溴化物的离去基团。六氟异丙醇的极性和水封存能力对于这些过程的成功至关重要。Re 2 O 7是 HOReO 3的预催化剂,可作为这些反应的成本较低且易于处理的促进剂。氧铼催化剂在类似取代的乙酸酯存在下选择性地活化醇,这表明与布朗斯台德酸催化相比具有独特的化学选择性和机制。
Direct Pd-catalyzed benzylation of highly electron-deficient perfluoroarenes
作者:Shilu Fan、Chun-Yang He、Xingang Zhang
DOI:10.1039/c0cc00598c
日期:——
An efficient and practical method to a wide range of perfluorinated unsymmetrical diarylmethanes with good to excellent yields and high regioselectivities has been developed by Pd-catalyzed direct benzylation of highly electron-deficient perfluoroarenes; excellent compatibility of functional groups has also been established.