Rapid, iterative syntheses of unsymmetrical di- and triarylboranes from crystalline aryldifluoroboranes

Abstract

A one-pot procedure to synthesise aryldifluoroboranes, ArBF2, from bench-stable arylsilanes is presented. These ArBF2 react conveniently with aryllithium reagents to form unsymmetrical ArAr′BF and BArAr′Ar′′ in high yield. Examples of all three classes of borane have been characterised crystallographically, allowing for elucidation of geometric and crystal packing trends in crystalline ArBF2