Reactivity of Half-Sandwich 16-e Carborane Complex CpCo[S2C2B10H10] with Triarylphosphines

o-Carborane reacts sequentially with n-butyllithium, sulfur and CpCo(CO)I2 under argon to give the half-sandwich 16-e carborane complex CpCo[S2C2B10H10]. CpCo[S2C2B10H10] reacts with PPh3, P(m-Tol)3, P(p-Tol)3 to afford addition products CpCo(PPh3)[S2C2B10H10] (1), Cp(P(m-Tol)3)Co[S2C2B10H10] (2), CpCo(P(p-Tol)3)[S2C2B10H10] (3), respectively. 1, 2 and 3 have been characterized by chemical analysis, mass-spectrometry, IR and NMR spectroscopy, and single crystal X-ray diffraction (CCDC nos. 2390939 (1), 2390940 (2) and 2390938 (3)).