The reaction of [AuCl(PR(3))] with [1,2-(Ph(2)P)(2)-1,2-C2B10H10] in refluxing ethanol proceeds with partial degradation (removal of a boron atom adjacent to carbon) of the close species to give [Au{(PPh(2))(2)C2B9H10}(PR(3))] [PR(3) = PPh(3) (1), PPh(2)Me (2), PPh(2)(4-Me-C6H4) (3), P(4-Me-C6H4)(3) (4), P(4-OMe-C6H4)(3) (5)]. Similarly, the treatment of [Au2Cl2(mu-P-P)] with [1,2-(Ph(2)P)(2)-1,2-C2B10H10] under the same conditions leads to the complexes [Au-2{(PPh(2))(2)C2B9H10}(2)(mu-P-P)] [P-P = dppe = 1,2-bis(diphenylphosphino)ethane (6), dppp = 1,3-bis(diphenylphosphino)propane (7)], where the dppe or dppp ligands bridge two gold nide-diphosphine units. The reaction of 1 with NaH leads to removal of one proton, and further reaction with [Au(PPh(3))(tht)]ClO4 gives the novel metallocarborane compound [Au-2{(PPh(2))(2)C2B9H9}(PPh(3))(2)] (8). The structure of complexes 1 and 7 have been established by X-ray diffraction. [Au{(PPh(2))(2)C2B9H10}(PPh(3))] (1) (dichloromethane solvate) crystallizes in the monoclinic space group P2(1)/c, with a = 17.326(3) Angstrom, b = 20.688(3) Angstrom, c = 13.442(2) Angstrom, c = 104.710(12)degrees, Z = 4, and T = -100 degrees C. [Au-2{(PPh(2))(2)C2B9H10}(2)(mu-dppp)] (7) (acetone solvate) is triclinic, space group P (1) over bar, a = 13.432(3) Angstrom, b = 18.888(3) Angstrom, c = 20.021(3) Angstrom, alpha = 78.56(2)degrees, beta = 72.02(2)degrees, gamma = 73.31(2)degrees, Z = 2, and T = -100 degrees C. In both complexes the gold atom exhibits trigonal planar geometry with the 7,8-bis(diphenylphosphino)7,8-dicarba-nido-undecaborate(1-) acting as a chelating ligand.