A Novel Dinuclear Ruthenium(I)/Ruthenium(III) Half-Sandwich Complex Containing Two Chelating 1,2-Dicarba-closo-dodecaborane-1,2-dithiolate Ligands and Its Reactivity with Alkynes†

[(p-cymene)RuCl2]2 reacts with 1,2-dicarba-closo-dodecaborane-1,2-dithiolate in the presence of excess sulfur to generate the first dinuclear complex, (p-cymene)Ru(μ-S2)Ru(S2C2B10H10)2 (1). Treatment of 1 with alkynes affords the addition complexes (p-cymene)Ru(μ-S2)Ru(S2C2B10H10)2(R1CCR2) (R1 = H (CO2Me), R2 = CO2Me (H), 2a (2b); R1 = C6H5, R2 = H, 3b; R1 = R2 = CO2Me, 4).