Reactivity of Ru(II) and V(III) complexes of diazafluorene derivatives towards B–H bonds

Abstract

We report the synthesis and characterization of Ru(II) and V(III) 4,5-diazafluorene derivatives, and their respective reactivity towards B–H bonds. A Ru(II) hydride dinitrogen complex reacts with HBpin to liberate the labile N2 ligand resulting in a dihydridoborate complex. Upon addition of either further HBpin or ClBpin a ligand-based borylation occurs. The first trialkylhydridoborate complex of vanadium was prepared by the addition of 3 eq. of K[HBEt3] to a V(III) chloride precursor supported by a 3,6--bis(mesityl) substituted 4,5-diazafluorene derivative, and features a (μ-H)B((μ-H)CHMe)2(Et) type of coordination mode for the [HBEt3]- ligand.