derivatives are efficiently deprotonated with strong bases to form α‐chlorocarbanions. These anions are long‐lived enough to enter VNS reactions with nitroarenes or nitroheteroarenes to give a variety of unsymmetrical o‐ and p‐nitrodiarylmethanes. Selectivity of the reaction can be controlled to some extent by changing metal counterions of the base.
Verfahren zur Herstellung von teilweise neuen Alkylbenzolen, die durch Fluor enthaltende Reste substituiert sind
申请人:BAYER AG
公开号:EP0084128A1
公开(公告)日:1983-07-27
Alkylbenzole, die durch Fluor enthaltende Reste substituiert sind, können durch Alkylierung der entsprechenden aromatischen Verbindungen in Fluorwasserstoff hergestellt werden.
通过在氟化氢中对相应的芳香族化合物进行烷基化,可以制备出被含氟自由基取代的烷基苯。
Friedel-Crafts Benzylation of Activated and Deactivated Arenes
作者:Gabriel Schäfer、Jeffrey W. Bode
DOI:10.1002/anie.201105380
日期:2011.11.11
going back makes possible facile Friedel–Craftsbenzylations with moderate reaction temperatures, simple reaction workups, and improved substrate scope for the formation of synthetically important diarylmethanes (see scheme). Upon complexation with BF3⋅OEt2, hydroxamates serve as reversible leaving groups that stabilize highly reactive carbocations. Even deactivatedarenes and electron‐deficient benzylhydroxamates