Synthesis of Fe-C C-M complexes through condensation of Fe-C C-H with M-H or M-NMe2

The iron acetylide Cp*(dppe)FeC=CH (Cp* = eta(5)-C5Me5, dppe = Ph2PCH2CH2PP h2) reacted with [Cp2Zr(H)Cl](n) (Schwartz's reagent, Cp = eta(5)-C5H5) to produce the C=C-bridged complex Cp*(dppe)FeC=CZrClCp2 in nearly quantitativ e yield instead of the expected CH=CH-bridged hydrozirconation product. The bulky ligand set around iron is postulated to prevent the addition of hydr ide at the carbon a to the metal center. Reaction of Cp*(dppe)FeC=CH with ( dimethylamino)trimethyltin gave the condensed product Cp*(dppe)FeC=CSnMe3 i n, nearly quantitative yield.