Some applications of 13C-Fourier nuclear magnetic resonance to stereochemical problems of transition metal–olefin complexes

Abstract

The ¹³C n.m.r. of tricarbonyl(trans-1,3-π-dimethylindane)chromium (I), tricarbonyl(π-cyclo-octatetraene)tungsten (II) and tricarbonyl(π-allyl)iron(II) iodide (III) and their corresponding free ligands have been studied. The spectrum of (I) shows a separate resonance for every carbon in the ligand ring. The spectrum of (II) shows a temperature dependence (0–90 °C) consistent with its classification as a ‘fluxional’ organometallic molecule. The spectrum of (III) in both the hydrocarbon and carbonyl regions shows the presence of two isomers consistent with previous investigations of this compound.