Synthesis and Reactivity of Ruthenatetraboranes: Molecular Structure of [RuH(B₃H₈)(CO)(PPh₃)₂]

Abstract

The reactions of [RuClH(CO)(PPh3)3] and [RuH(CO)(NCMe)2(PPh3)2]C1O4 with [NMe4][B3H8] provide the ruthenatetraborane [RuH(B3H8)(CO)(PPh3)2] [crystallographically characterized: monoclinic crystals of space group P21/c (Z = 4), in a unit cell of dimensions a = 14.424 (5) Å, b = 10.628 (4) Å, c = 22.987 (9) Å, and β = 97.86 (3)°]. The integrity of the RuB3 moiety is retained in the reactions with N-halosuccinimides, leading to the halo derivatives [RuX(B3H8)(CO)(PPh3)2] (X = CI, Br, I); however, reaction of the bromo derivative with Na[S2CNMe2] leads to rupture of the metallatetraborane and formation of [Ru(S2CNMe2)2(CO)(PPh3)]. Show more