Abstract
Photolysis Of Os 3(CO) 12 in the presence of alkenes with filtered radiation (λ > 370 nm) leads to fragmentation of the cluster and gives mononuclear Os(CO) 4(η 2-alkene) derivatives and dinuclear 1,2-diosmacyclobutanes, Os 2(CO) 8(μ-η 1,η 1-CHRCHR′). Attempts to extend the photochemical method to the preparation of other types of diosmacycles met with little success. As an alternative synthetic approach the exchange of ethylene in Os 2(CO) 8(μ-η 1,η 1-C 2H 4), 3a, for other unsaturated organic substrates was explored. Reaction of 3a with alkynes gave diosmacyclobutenes, whereas with dienes regiospecific 1,2-addition was observed. The scope and limitations of the exchange reactions are reviewed. The properties of the diosmacycles and of the product obtained via hydride abstraction from 3a are outlined.
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