Group IB metal chemistry. Part 3. Reactions between bromo- and chloro-dicarbonyl-π-cyclopentadienyliron and copper acetylides

Abstract

Reactions between [(π-C₅H₅)Fe(CO)₂X](X = Cl, Br) and CuC₂R (R = Ph, p-MeC₆H₄, p-FC₆H₄, or C₆F₅) afford the complexes [{(π-C₅H₅)Fe(CO)₂(C₂R)CuX}₂]. In these, the iron acetylide group is π-bonded to copper; the complexes are dimeric via copper–halogen bridges. An alternative method of synthesis is from the acetylide and the copper(I) halide in acetone. Reactions between these complexes and [Fe₂(CO)₉] afford trinuclear [(π-C₅H₅)Fe₃(C₂R)(CO)₇].