Friedel–Crafts benzylation of arenes with benzyl fluorides has been developed. The reaction produces 1,1‐diaryl alkanes in good yield under mild conditions without the need for a transition metal or a strong Lewis acid. A mechanism involving activation of the CFbond through hydrogen bonding is proposed. This mode of activation enables the selective reaction of benzylic CF bonds in the presence of other benzylic
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。
Vessel Effect in C-F Bond Activation Prompts Revised Mechanism and Reveals an Autocatalytic Glycosylation
作者:Michael M. Nielsen、Yan Qiao、Yingxiong Wang、Christian M. Pedersen
DOI:10.1002/ejoc.201901755
日期:2020.1.9
A significant vesseleffect during acid catalyzed C–Fbondactivations has been documented and led to revisedmechanisms for both glycosylations and benzyl fluoride activation. An autocatalytic chemical glycosylation was discovered during this investigation, further signifying the significant effect of the vessel material on a given reaction.