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Abstract
The reaction of trans-3,4-bis(trifluoromethylsulfonyloxymethyl)oxolane ( trans- 1) with the carbonyl metalates [(η 5- C 5H 5)M(CO) η] − ( n = 3, M Mo ( a), W ( b); n = 2, M Fe ( c)) and [M(CO) 5] − (M Mn ( d), Re ( e)) in diethyl ether and THF, respectively, results in the formation of the hydrocarbon bridged complexes trans- 2a– e. Depending on the solvent, the reaction of trans- 1 with [Mn(CO) 5] − also affords the cyclic carbene complex trans- 3d. The action of CO on the manganese compound trans- 2d yields the diacyl bridged complex trans- 4d. By reaction of a 3:2 mixture of cis- 1 and trans- 1 with Na 2[Os(CO) 4] in dimethyl ether, the 3-oxa-7-osmabicyclo[3.3.0]octanes cis- 5 and trans- 5 are formed with the same ratio of isomers. The structures of trans- 2e and cis- 5 were elucidated by X-ray structural analysis. trans- 2e crystallizes in the orthorhombic space group Pbcn with Z = 8, the bridging THF-ligand having twist conformation. cis- 5 crystallizes in the monoclinic space group P2 1 / n with Z = 4; both rings reveal an envelope conformation.
Published Version
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