Dimolybdenum and Ditungsten Cyclopentadienyl Carbonyls with Electron-Rich Phosphido Bridges. Synthesis of the Hydrido Phosphido Complexes [M2Cp2(μ-H)(μ-PRR‘)(CO)4] and Unsaturated Bis(phosphido) Complexes [M2Cp2(μ-PR2)(μ-PR‘R‘ ‘)(CO)x] (x= 1, 2; R, R‘, R‘ ‘ = Et, Cy,tBu) | Publicación