2016
DOI: 10.1039/c6cc05352a
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Synthesis and characterization of a homogeneous and silica supported homoleptic cationic tungsten(vi) methyl complex: application in olefin metathesis

Abstract: A method for the synthesis of a homogeneous cationic tungsten(vi)pentamethyl complex [(WMe)(CF)BMe] from neutral tungstenhexamethyl (WMe) and a silica supported cationic tungstentetramethyl complex [([triple bond, length as m-dash]Si-O-)WMe (CF)BMe] from a neutral silica supported tungstenpentamethyl complex [([triple bond, length as m-dash]Si-O-)WMe] is described. In both cases a direct demethylation using the B(CF) reagent was used. The aforesaid complexes were characterized by liquid or solid state NMR spec… Show more

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Cited by 10 publications
(18 citation statements)
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“…[514] Anumber of mechanisms for the formation of alkylidenes from surface oxo species have been proposed. [519][520][521][522][523][524][525][526] Supporteda lkylidynes were also shownt o be active metathesis catalystp recursors. Thef irst attempts to applyo rganometallicp recursorsi nt he preparationo fs upported metathesis catalysts date back to the1 970s with theu se of WMe 6 [517] ando ther perhydrocarbyl complexes [518] that likely generate surface alkylidenesi nsitu.…”
Section: Surface Sites In Industrial Catalystsmentioning
confidence: 97%
“…[514] Anumber of mechanisms for the formation of alkylidenes from surface oxo species have been proposed. [519][520][521][522][523][524][525][526] Supporteda lkylidynes were also shownt o be active metathesis catalystp recursors. Thef irst attempts to applyo rganometallicp recursorsi nt he preparationo fs upported metathesis catalysts date back to the1 970s with theu se of WMe 6 [517] ando ther perhydrocarbyl complexes [518] that likely generate surface alkylidenesi nsitu.…”
Section: Surface Sites In Industrial Catalystsmentioning
confidence: 97%
“…Die ersten Versuche zur Anwendung metallorganischer Vorstufen bei der Herstellung von Trägerkatalysatoren für Metathesen gehen auf die 1970er Jahre zurück, wobei WMe 6 und andere Perhydrocarbylkomplexe verwendet wurden, die wahrscheinlich Oberflächenalkylidene in situ erzeugen. Dieser Ansatz wurde kürzlich mit fortgeschrittenen Charakterisierungsverfahren neu untersucht (Abschnitt 7.3.2.2) . Ferner wurde gezeigt, dass auch trägerfixierte Alkylidine Vorstufen von aktiven Metathesekatalysatoren sind .…”
Section: Alkenmetatheseunclassified
“…Durch Verankern von WMe 6 auf Siliciumdioxid wird (≡SiO)WMe 5 erhalten, das durch α‐H‐Abstraktion Methyliden‐ und Methylidin‐Oberflächenspezies liefert, die seine Aktivität bei der Olefinmetathese erklären (Schema ) . Die Behandlung von (≡SiO)WMe 5 mit B(C 6 F 5 ) 3 ergibt kationisches [(≡SiO)WMe 4 ] + [MeB(C 6 F 5 ) 3 ] − , das eine gute Aktivität bei der Selbstmetathese terminaler und interner Olefine und ROMP von Cycloocten bei Raumtemperatur aufweist …”
Section: Alkenmetatheseunclassified
“…With the precedents of Buchmeiser and co-workers who developed the first cationic tungsten-oxo-alkylidene-NHC complex (NHC = N-heterocyclic carbene) [11,12], where the NHC was introduced to stabilize the cationic metal centre, together with the also tungsten based cationic complex WMe 5 + [13], to improve the catalysts in terms of reactivity and selectivity, and taking…”
Section: Introductionmentioning
confidence: 99%