Carbon-13 nuclear magnetic resonance spectroscopic study of tricarbonyldieneiron complexes: methyl substituent effects

Abstract

From a comparison of β-effects given by methyl substituents in tricarbonyldieneiron complexes with those of the corresponding uncomplexed 1,3-dienes, it is concluded that bonding to iron results in a change in p-bond orders of the ligand. This change is consistent with the structure (1) making an important contribution to bonding in these complexes.