C-C BOND FORMATION BETWEEN (ETA(1)-ETA(5)-CH2C5ME4)FE2(CO)6 AND CS2 TO GIVE THE TRIIRON COMPLEX ((ETA(5)-C5ME4)CH2CS2)FE3(CO)8

Reaction of the tetramethylfulvene-bridged complex (eta1:eta5-CH2C5Me4 )Fe2(CO)6 (1) with CS2 produces the triiron complex {(eta5-C5Me4)CH2CS 2}Fe3(CO)8 (2) and the monoiron complex {(eta5-C5Me4)CH2CS2}Fe(CO)2 (3 ) in high yields via C-C bond formation. X-ray crystallography of 2 sh ows that this complex contains a dithiocarboxylato ligand, S2CCH2C5Me4 , which bridges three iron fragments in a novel coordination mode. Cry stal data for 2: monoclinic, space group P2(1)/a, Z = 4, a = 18.048(3) angstrom, b = 11.990(1) angstrom, c = 12.308(1) angstrom, beta = 94.7 4(1)degrees, V = 2654.2(5) angstrom3, R = 0.055, and R(w) = 0.077 base d on 4327 reflections with [\F(o)\ > 3sigma(F(o)].