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- W2025238466 abstract "Abstract Alkoxycarbene complexes of tungsten, e.g. (CO) 5 WC(CH 3 )OEt ( 13 ) react with 1,2- and 1,4-dihydropyridines, to give, upon transfer of a hydride to the carbene carbon, elimination of ethanol, and readdition of pyridine to an unstable alkylidene complex (CO) 5 WC(H)CH 3 ( 22 ), pyridinium ylide complexes of the type (CO) 5 W − –C(H)(CH3)Py + ( 17 ). A second pyridinium ylide complex (CO) 5 W–C(H)(CH 3 )C 5 H 7 N ( 16 ), and a third dihydropyridinium complex (CO) 5 W–C(H)(CH 3 )C 8 H 11 N ( 15 ), resulting from the interaction of respectively 2,5-dihydropyridine and 5-isopropylidene-2,5-dihydropyridine with (CO) 5 WC(H)(CH 3 ) were also isolated and fully characterized by X-ray crystallography. The origin of the two latter complexes could be established. The new N -ylide complexes react with olefins to give cyclopropanes. Especially interesting, as far as the yields are concerned, is the interaction of highly nucleophilic olefins such as enamines with (CO) 5 W − –C(H)PhPy + ( 25 ) which leads to isomeric cyclopropylamines. The mechanism of their formation will be discussed." @default.
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- W2025238466 date "1998-09-01" @default.
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- W2025238466 title "Interaction of dihydropyridines with alkoxycarbene complexes of tungsten: formation and use as cyclopropanation reagents of pyridinium ylide complexes" @default.
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- W2025238466 doi "https://doi.org/10.1016/s0022-328x(98)00673-1" @default.
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