Abstract
The reaction of Os3(CO)11(NCMe) with 2-vinylthietane 2 at 25°C yielded two products: Os2(CO)6(η4-μ-SCH2CH2CHCHCH2) 3 (18% yield) and Os3(CO)10[η2-μ-OC(CH2CHCHCH2CH2S)] 4 (36% yield). Compound 4 was characterized by single crystal X-ray diffraction analysis. It contains a triangular triosmium cluster with ten linear terminal carbonyl ligands and a 3-hexeneoylthiolate ligand that bridges an open edge of the cluster through both the sulfur atom and the ketonyl group terminii. Compound 3 has only two osmium atoms, six carbonyl ligands and a bridging pentenylthiolate ligand. The ring opening of vinylthietane by a triosmium cluster occurs exclusively at the vinyl-substituted carbon atom.
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