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Regioselective addition of mixed-chalcogenide iron carbonyl clusters Fe2(CO)6(μ-EE′) (E ≠ E′, E, E′ = S, Se, Te) to a carbon-carbon triple bond activated by a metal carbene fragment.
, Mathur P., Rheingold A.L., Liable-Sands L.M.
Published in American Chemical Society
1997
Volume: 16
   
Issue: 15
Pages: 3536 - 3540
Abstract
From the room-temperature reaction of the transition-metal alkynyl Fischer carbene complexes (CO)5M=C(OEt)(C≡CPh) (M = Cr, W) with the mixed-chalcogenide compounds Fe2(CO)6(μ-EE′) (E ≠ E′, E, E′ = S, Se, Te), the following new trimetallic adducts were obtained: Fe2(CO)6μ-EC(Ph)=C(E′)[(OEt)C=M(CO) 5] 1-6 (1, 85%, E = S, E′ = Se, M = Cr; 2, 82%, E = S, E′ = Se, M = W; 3, 84%, E = S, E′ = Te, M - Cr; 4, 80%, E = S, E′ = Te, M = W; 5, 83%, E = Se, E′ = Te, M = Cr; 6, 81%, E = Se, E′ = Te, M = W). In addition, trace amounts of the corresponding alkenyl Fischer carbene complexes (CO)5M=C(OEt)-(CH=C(OMe)Ph 7-8 (7, M = Cr; 8, M = W) were also formed in each case. Compounds 1-6 were characterized by IR and 1H, 13C, 77Se, and 125Te NMR spectroscopy. Crystallographic analyses of the compounds 2, 3, and 6 were carried out. The structures of 2, 3, and 6 can be described as Fe2EE′ (E, E′ = S, Se, Te) tetrahedral butterfly cores containing the alkynyl Fischer carbene as a bridge between the two wingtip chalcogens with three terminally bonded carbonyl groups on each Fe atom.
About the journal
JournalData powered by TypesetOrganometallics
PublisherData powered by TypesetAmerican Chemical Society
ISSN02767333
Open AccessNo