13C NMR studies on tricarbonylchromium complexes of dimethylaminofulvene and diphenylfulvene

The ¹³C NMR spectra of tricarbonylchromium complexes of dimethylaminofulvene diphenylfulvene have been studied. Comparison of the ¹³C NMR spectra of these complexes with those of the corresponding non-coordinated fulvenes shows that the contribution from the ylidic structure of the π-ligand in the first complex increases when the Cr atom becomes coordinated, while in the second complex this coordination does not favour a formation of the ylidic structure of the π-ligand.