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.