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• W2206370802 startingPage "83" @default.
• W2206370802 abstract "The synthesis and reactions of bimetallic Zr(II)–Mo(0) complexes with bridging C5H4PPh2 ligands (henceforth abbreviated as Cp′) are described. Reaction of Cp2′ZrCl2 (1) with n-butyllithium in THF produces a metastable material tentatively formulated as Cp2′Zr·2 LiCl·4 THF (2). Diphenyldisulfide instantaneously converts 2 into the Zr(IV) dithiolate Cp2′Zr(SPh)2 (3). When 2 is treated with [Mo(CO)4(norbornadiene)], an unstable intermediate is formed which can be trapped in good yield with tert-butylisocyanide to give [Cp2′Zr(CNt-Bu)2Mo(CO)4] (4). Treatment of [Cp2′Zr(Cl)(Me)Mo(CO)3L] (LCO (5a), PMe3 (5b)) with cyclohexenyllithium in the presence of PMe3 gives the corresponding binuclear cyclohexyne complexes [Cp2′Zr(PMe3)(C6H8)Mo(CO)3L] (6a, b). These complexes are fluxional on the NMR timescale due to a flip motion of the cyclohexyne ligand between two equivalent positions (ΔG≠=(40±8) kJ/mol). Protonation in THF converts 6a into the cyclohexenyl zirconium complex [Cp2′Zr(THF)(C6H9)Mo(CO)4]BPh4 (7). Alkenes such as styrene, 4-chlorostyrene or norbornadiene give the expected insertion products 8a–c which, due to their insufficient stability, could not be isolated. Stable insertion products were, however, obtained with ketones such as benzophenone (9a), 1,3-diphenylacetone (9b) and cyclohexanone (9c)." @default.
• W2206370802 created "2016-06-24" @default.
• W2206370802 creator A5023457930 @default.
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• W2206370802 date "1998-02-01" @default.
• W2206370802 modified "2023-10-17" @default.
• W2206370802 title "Bimetallic complexes" @default.
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• W2206370802 doi "https://doi.org/10.1016/s0022-328x(97)00582-2" @default.
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