Reactions of co-ordinated ligands. Part X. Reactions of trifluoroacetonitrile with π-allylic complexes of iridium(I) and with dicarbonyl(cyclopentadienyl)methyliron: the molecular and crystal structure of carbonyl(η-cyclopentadienyl)-1-[(1-iminotrifluoroethyl)imino]trifluoroethyl-Nω-iron

Abstract

Reactions of trifluoroacetonitrile with [Ir(π-2-MeC₃H₄)(CO)(L)₂](L = PPh₃ or AsPh₃) yield six-membered chelate ring complexes [I[graphic omitted]H(CO)(L)](L = PPh₃ or AsPh₃). A similar reaction of CF₃CN with [Ir(π-C₃H₅)(CO)(PPh₃)₂] yields [[graphic omitted]H(CO)(PPh₃)] together with [[graphic omitted]H(CO)(PPh₃)₂]. Reactions of [Ir(π-1-MeC₃H₄)(CO)(PPh₃)₂], [IrH(CO)₂(PPh₃)₂], or [IrH(CO)(PPh₃)₃] with CF₃CN yield a five-membered chelate ring complex trans-[[graphic omitted](CF₃)(CO)(PPh₃)₂]. An X-ray crystallographic study of the complex obtained from the reaction of CF₃CN with [FeMe(CO)₂(η-C₅H₅)] shows it to have the five-membered ring structure [F[graphic omitted](CF₃)(CO)(η-C₅H₅)], in which the F[graphic omitted] ring together with the H atom of the NH group and the C atoms of the two CF₃ groups are planar. Reaction of this latter complex with dimethylphenylphosphine yields [F[graphic omitted](CF₃)(PMe₂Ph)(η-C₅H₅)].