CRYSTAL-STRUCTURES OF TRANSITION-METAL LIGAND DICARBONYLS

The crystal structure of beta-dicarbonyl, beta-ketoester and malonyl c ompounds of the transition metals with a variety of bonding frameworks have been reviewed, including the cyclometallation of acetone, tricar bonyls, and tetracarbonyls. The 'metalla-beta-dicarbonyl' with the bri dging acyl group recently explored in processes of the carbonyl methyl enation reactions, and 'beta-oxoacyl' compounds or 'mu-malonyl' comple xes are also described in this review, displaying keto-enol tautomeris m and also peculiar regioselective alkylation. Some beta-dicarbonyl Rh complexes functioning as a precursor of homogeneous active catalyst f or hydrogenation, selective hydroformylation, and isomerization of ole fin, and also preparation of diethyleneglycol from the synthesis gas a re summarized.