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

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 2,6-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.Graphical abstractA Ru(II) hydride dinitrogen complex supported by the 4,5-diazafluorenyl ligand engages in both metal- and ligand-based reactivity with boranes. The reaction of a V(III) trichloride complex supported by a 4,5-diazafluorene derivative with K [HBEt3] yielded the first trialkylhydridoborate complex of vanadium.

Source: Journal of Organometallic Chemistry - July 26, 2018 Category: Chemistry Source Type: research