Metal carbonyl chemistry. Part XII. Reactions of metal carbonyl anions with some perfluoroaromatic compounds

Abstract

Pentafluoropyridine and pentafluorobenzonitrile react with the anions [Mn(CO)₅]^– and [Re(CO)₅]^– to give the complexes NC₅H₄·M(CO)₅ and NC·C₆F₄·M(CO)₅(M = Mn or Re). The more reactive compound, tetrafluorophthalonitrile, has been shown to react with the weak nucleophiles [Co(CO)₂L₂]^–[L =(PhO)₃P or EtC(CH₂O)₃P], and [Co(CO){P(OCH₂)₃CEt}₃]^– to form complexes, but the anions [Co(CO)₄]^–, [Co(CO)₃P(OPh)₃]^– and [Fe(CO)₄]^2– do not react. Ethyl pentafluorobenzoate and pentafluorobenzoic acid react with [Mn(CO)₅]^– and [(π-C₅H₅)Fe(CO)₂]^– to give the complexes RO₂C·C₆F₄·Mn(CO)₅ and RO₂C·C₆F₄·Fe(CO)₂(π-C₅H₅)(R = H or Et). The i.r. and ¹⁹F and ¹H n.m.r. spectra of these compounds are discussed.