SYNTHESIS AND CHARACTERIZATION OF MIXED ISOCYANIDE COMPLEXES OF CYCLOPENTADIENYLIRON

The alkylation of η5-C5H5Fe(CO)(CN)(CNR) complexes with primary, secondary, and tertiary alkyl iodides, R′I (R ≠ R′) produces the mixed isocyanide species [η5-C5H5Fe(CO)(CNR)(CNR′)]I. Infrared and NMR spectra of the new complexes are dischased. The effect of metal coordination on the 13C spectra of cationic and neutral isocyanide complexes is considered. The use of the chiral alkyl iodides, secbutyliodide and α-phenylethyliodide, results in configurationally non-labile diastereomers which, in the case of compounds of the latter, can be detected by 1H and 13C NMR spectra. © 1979.