Abstract
The reaction of Os 3(CO) 10(NCMe) 2 with 2-vinyltetrahydrothiophene (VTHT) at 25°C yielded two products: Os 3(CO) 10[μ-SCH 2CH 2C(H)C(H)C(H)CH 2](μ-H), 1 (38% yield) and Os 2(CO) 6[μ-η 4-S(CH 2) 3CHCHCH 2](μ-H), 2 (27% yield) after 48 h. Both products were characterized by single-crystal X-ray diffraction analysis. Compound 1 contains a triangular triosmium cluster with ten linear terminal carbonyl ligands, a hydride ligand and a hexadienethiolate ligand. Compound 2 contains only two mutually bonded osmium atoms, six linear terminal carbonyl ligands and a hexenylthiolate ligand that bridges the two osmium atoms via a bridging sulfur atom and three of the carbon atoms at the C-terminus of the hexenyl group. Ring opening of VTHT by a triosmium cluster occurs exclusively at the vinyl-substituted carbon atom.
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