1968, pp 90-164

Five-electron ligands

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Hydrocarbon ligands which formally contribute five electrons when bonding to a metal are called ‘Dienyl’ ligands. Five-electron systems are found for cyclic 5-, 6- and 7-membered hydrocarbon ligands and non-cyclic ligands. The π-cyclopentadienyl group is the commonest ligand in this class and the chemistry of cyclopentadienyl metal complexes is discussed first. For convenience, the transition metal cyclopentadienide complexes are also discussed in this section.