HYDROCARBYL LIGAND DERIVATIVES OF GROUP-6 GROUP-9 HETEROMETALLIC CLUSTERS

The synthesis and reactivity of group 6-group 9 heterometallic cluster s containing hydrocarbon ligands is reviewed. A variety of methods has been employed in the synthesis of this class of clusters. These metho ds are organized into several general reaction types: metal exchange r eactions, the reactions between dinuclear compounds, reactions utilizi ng mononuclear metal alkylidynes, and condensation reactions with othe r mononuclear reagents. The reactions of the resulting heterometallic clusters with alkynes, protons and carbon electrophiles, and miscellan eous substitution reactions are discussed. Applications in catalysis a re briefly summarized.