The alkali metal reductions of a series of monomeric and dimeric cyclopentadienyl-substituted metal carbonyls in hexamethylphosphoramide provide principally C5H5V(CO)32- from C5H5V(CO)4, Mn(CO)43- from C5H5Mn(CO)3, Co(CO)4- from C5H5Co(CO)2, and C5H5M(CO)y- from corresponding [C5H5M(CO)y]2, where M = Mo, Fe and Ni for y = 3, 2 and 1, respectively. The spectral and chemical properties of many of these reduced species are described.
Bibliographical noteFunding Information:
We acknowledge support of this research by the donors of the Petroleum Research Fund, administered by the American Chemical Society. J.E.E. and R.A.F. thank the E_I_ duPont de Nemours and Co. for generous support of this research in the form of a Young Faculty Grant and a Graduate Fellowship, respectively. J.E.E. also is grateful to Prof. Robert Bergman of Caltech for a helpful discussion and disclosure of unpublished observations on the vanadium and manganese systems obtained in his laboratory_