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- W2086645081 abstract "The chemistry of the molybdenum and tungsten complexes containing bis (η-cyclopentadienyl) M (Cp2M) fragment is described. Protonation of Cp2MH2 with p-toluenesulfonic acid (TsOH) afforded isolable trihydrido cationic complexes, [Cp2MH3]+TsO-. When the reaction was carried out in the presence of ketones, aldehydes, or imines, their reductions to yield the corresponding alcohols or amines took place : the reactions with high diastereo- and moderate enantio-selectivity were achieved. The reactions of Cp2MoH2 with allylic alcohols in the presence of protonic acids yielded the cationic η-allyl complexes accompanied with cyclic γ-hydorxypropyl complexes. The first molybdenocene derivatives with the stable carbene, imidazole-2-ylidene or imidazolin-2-ylidene, were successfully synthesized starting from Cp2Mo (H) OTs or [Cp2Mo (H) Li]4. Cp2W (H) Ph, which was prepared by irradiating Cp2WH2 in benzene, was reacted with RCOOH to yield either carboxylato (hydrido) -or dicarboxylato-tungsten complexes, and with CO2 in the presence of water to give carbonato derivative. Cp2M(OTs)2 was converted to the di-μ-hydroxy dinuclear complex by treating it with water in acetone in the presence of Cp2MH2. Finally, the corresponding chemistries involving the bis (MeCp) complex in the place of Cp2 are described." @default.
- W2086645081 created "2016-06-24" @default.
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- W2086645081 date "2004-07-13" @default.
- W2086645081 modified "2023-09-24" @default.
- W2086645081 title "Syntheses and Reactivity of Group 6 Metallocene-Type Complexes Based on Bis(η-cyclopentadienyl)molybdenum and -tungsten Fragments" @default.
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- W2086645081 doi "https://doi.org/10.1002/chin.200428232" @default.
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