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

A method for the synthesis of a homogeneous cationic tungsten(VI)pentamethyl complex [(WMe5)+(C6F5)3BMe−] from neutral tungstenhexamethyl (WMe6) and a silica supported cationic tungstentetramethyl complex [([triple bond, length as m-dash]Si–O–)WMe4+ (C6F5)3BMe−] from a neutral silica supported tungstenpentamethyl complex [([triple bond, length as m-dash]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)3BMe−] shows moderate activity whereas the supported cationic complex [([triple bond, length as m-dash]Si–O–)WMe4+(C6F5)3BMe−] exhibits good activity in olefin metathesis reactions

This work was supported by funds from the King Abdullah University of Science and Technology (KAUST) office of sponsored research (OSR). A. P. thanks the Spanish MINECO for the project CTQ2014-59832-JIN. The authors also thank Dr Nassima Riache for fruitful discussions

© Chemical Communications, 2016, vol. 52, núm. 75, p. 11270-11273

Reaction mechanisms (Chemistry)

Author: Dey, Raju
Samantaray, Manoja K.
Poater Teixidor, Albert
Hamieh, Ali
Kavitake, Santosh
Abou-Hamad, Edy
Callens, Emmanuel
Emwas, Abdul Hamid
Cavallo, Luigi
Basset, Jean Marie
Date: 2016 January 1
Abstract: A method for the synthesis of a homogeneous cationic tungsten(VI)pentamethyl complex [(WMe5)+(C6F5)3BMe−] from neutral tungstenhexamethyl (WMe6) and a silica supported cationic tungstentetramethyl complex [([triple bond, length as m-dash]Si–O–)WMe4+ (C6F5)3BMe−] from a neutral silica supported tungstenpentamethyl complex [([triple bond, length as m-dash]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)3BMe−] shows moderate activity whereas the supported cationic complex [([triple bond, length as m-dash]Si–O–)WMe4+(C6F5)3BMe−] exhibits good activity in olefin metathesis reactions
This work was supported by funds from the King Abdullah University of Science and Technology (KAUST) office of sponsored research (OSR). A. P. thanks the Spanish MINECO for the project CTQ2014-59832-JIN. The authors also thank Dr Nassima Riache for fruitful discussions
Format: application/pdf
ISSN: 1359-7345 (versió paper)
1364-548X (versió electrònica)
Document access: http://hdl.handle.net/10256/13169
Language: eng
Publisher: Reaction mechanisms (Chemistry)
Collection: MINECO/PE 2015-2018/CTQ2014-59832-JIN
Reproducció digital del document publicat a: http://dx.doi.org/10.1039/c6cc05352a
Articles publicats (D-Q)
Is part of: © Chemical Communications, 2016, vol. 52, núm. 75, p. 11270-11273
Rights: Tots els drets reservats
Subject: Metàtesi (Química)
Metathesis (Chemistry)
Mecanismes de reacció (Química)
Reaction mechanisms (Chemistry)
Title: Synthesis and characterization of a homogeneous and silica supported homoleptic cationic tungsten(VI) methyl complex: Application in olefin metathesis
Type: info:eu-repo/semantics/article
Repository: DUGiDocs

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