Decarbonylation of molybdenum hexacarbonyl in refluxing decane in the presence of the bulky diposphine ligands, bis(dicyclohexylphosphino)methane (dcpm) or bis(dicyclohexylphosphino)ethane (dcpe) yielded the mononuclear, singly chelating complexes, Mo(CO)₄(dcpm) (1) and Mo(CO)₄(dcpe) (2) in about 50% yield.  These complexes appear to be similar in structure to previously reported molybdenum-dppm (bis-diphenylphosphino)methane and molybdenum-dppe (bis(diphenylphosphino)ethane) complexes.  Further reaction of complex (1) with one mole equivalent of dcpm yielded a dinuclear, bridging complex tentatively formulated as Mo₂(CO)₄(m-dcpm)₂(h²-dcpm)₂ (3). Complexes (1) and (2) were also reacted with strong acids in an attempt to generate molybdenum-hydrido complexes.  The results of these reactions will be discussed. Reaction of (3) with carbon monoxide or dioxygen resulted in the fragmentation of the dinuclear complex.