Zinc hydridotriphenylborates supported by a neutral macrocyclic polyamine

Abstract

The zinc hydridotriphenylborates [(L)Zn(TMDS)][HBPh₃] and [(L)ZnX][HBPh₃] (L = Me₄TACD, Me₄[12]aneN₄; TMDS = N(SiHMe₂)₂; X = Cl, Br, I) were synthesized by BPh₃-mediated β-SiH abstraction and salt metathesis with KHBPh₃, respectively. CO₂ is rapidly inserted into the B–H bonds. [(L)Zn(TMDS)][HBPh₃] catalyzes the hydroboration of polar substrates including CO₂.