Chemistry of the metal carbonyls. Part XLIX. Dicarbonyl-π-cyclopentadienylruthenium fluorocarbon complexes

Abstract

Reaction between sodium cyclopentadienide and [Ru(CO)₃Cl₂]₂ affords [(π-C₅H₅)Ru(CO)₂]₂, in 40–50% yield based on ruthenium trichloride. Treatment with sodium amalgam gives the anion [(π-C₅H₅)Ru(CO)₂]^–, which has been shown to be less reactive than [(π-C₅H₅)Fe(CO)₂]^– in reactions with CF₃CF:CF₂, cyclo-C₆F₁₀, C₆F₆, o-(CN)₂C₆F₄, C₅F₅N, CF₃COCl, or C₆F₅COCl. From the latter reaction, the para-disubstituted complex (π-C₅H₅)Ru(CO)₂C₆F₄CORu(CO)₂(π-C₅H₅) has been isolated. The infrared and ¹⁹F n.m.r. spectra of the products are compared with those of the corresponding iron complexes.