Generation of reactive borenium ions in the 2,3-benzazaborolidine series
Abstract
Borenium ions 1, generated by hydride abstraction from 3 using trityl salts, are exceptionally potent electrophiles, as evidenced by fluoride abstraction from tetrafluoroborate and even from tetrakis[3,5-bis(trifluoromethyl)phenyl]-borate.