Synthesis and characterization of a homogeneous and silica supported homoleptic cationic tungsten(vi) methyl complex: application in olefin metathesis

Raju Dey, Manoja Samantaray, Albert Poater, Ali Imad Ali Hamieh, Santosh Giridhar Kavitake, Edy Abou-Hamad, Emmanuel Callens, Abdul-Hamid M. Emwas, Luigi Cavallo, Jean-Marie Basset

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Abstract

A method for the synthesis of a homogeneous cationic tungsten(VI)penta-methyl complex [(WMe5)(+)(C6F5)(3)BMe-] from neutral tungstenhexamethyl (WMe6) and a silica supported cationic tungstentetramethyl complex [( Si-O-)WMe4+ (C6F5)(3)BMe-] from a neutral silica supported tungstenpentamethyl complex [( Si-O-)WMe5] is described. In both cases a direct demethylation using the B(C6F5)(3) reagent was used. The aforesaid complexes were characterized by liquid or solid state NMR spectroscopy. Interestingly, the homogeneous cationic complex [(WMe5)(+)(C6F5)(3)BMe-] shows moderate activity whereas the supported cationic complex [( Si-O-)WMe4+(C6F5)(3)BMe-] exhibits good activity in olefin metathesis reactions.
Original languageEnglish (US)
Pages (from-to)11270-11273
Number of pages4
JournalChem. Commun.
Volume52
Issue number75
DOIs
StatePublished - 2016

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