Reactions of molybdenum-cobalt complex with phenylacetylene: X-ray crystal structure of (η5-C5H5)>

Article abstract of DOI:10.1016/0022-328X(94)05389-S

Reaction of 5-C5H5)> (1) with phenylacetylene in tetrahydrofuran at 60 deg C produced a heterobimetallic compound, (η⁵-C5H5)> (2), in high yield.Compound 2 was characterized by mass, infrared and 1H, 13C and 31P NMR spectra.The X-ray crystal structure of 2 was determined: orthorhombic, P_bca, a = 12.479(3), b = 15.975(3), c = 21.570(3) Angstroem, V = 4299.8(15) Angstroem³ and Z = 8, R_w(F) = 4.00percent for 2143 (F > 4?(F)) observed reflections.In 2, the cobalt fragment is at apical and the molybdenum fragment is at basal position of the pseudo-pentagonal pyramidal structure. (PPh3)(η⁵-C5H5)> (3) was obtained in excellent yield from the reaction of 1 with phenylacetylene at lower temperature.Compound 3 can be quantitatively converted into 2 by reaction with excess phenylacetylene at 60 deg C.Keywords: Molybdenum; Cobalt