Cationic Terminal Aminoborylene Complexes: Controlled Stepwise Insertion into MB and BN Double Bonds

Abstract

One thing leads to another: Reactions of the cationic BN vinylidene analogues 1-[BArF4] (R=Cy, iPr; ArF=3,5-(CF3)2C6H3) towards dicyclohexylcarbodiimide proceed by unprecedented insertion chemistry for terminal borylene complexes. Controlled, stepwise insertion into the FeB and BN bonds is demonstrated, sequentially forming four-membered rings linked at a spirocyclic boronium center.