C-13 NMR-SPECTRA OF CYCLOMERCURATED FERROCENYLIMINES - SUBSTITUENT EFFECTS AND CONFORMATIONS IN THE FERROCENES

Three series of cyclomercurated ferrocenylimines (2-chloromercurio-fer rocenylinines) have been studied using C-13 NMR spectroscopy. Good to excellent linear relationships have been found to exist between the ch emical shifts of the carbon atoms in the ferrocenyl moiety and normal Hammett substituent constants sigma(m) and sigma(p). The delta values of the iminyl carbon atoms show excellent linear correlations with the sigma values. In three series of the ferrocenes, the sensitivity of t he carbon atoms to the substituent effect is different, which is discu ssed in terms of the twist angle between the N-phenyl ring and the C-C =N-C plane. The relative sensitivity of the chemical shifts on differe nt positions in ferrocenyl moiety to the substituent effect has also b een presented.