Alkane metathesis with the tantalum methylidene [( SiO)Ta(=CH2)Me-2]/[( SiO)(2)Ta(=CH2)Me] generated from well-defined surface organometallic complex [( SiO)(TaMe4)-Me-V] - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of the American Chemical Society Année : 2015

Alkane metathesis with the tantalum methylidene [( SiO)Ta(=CH2)Me-2]/[( SiO)(2)Ta(=CH2)Me] generated from well-defined surface organometallic complex [( SiO)(TaMe4)-Me-V]

Résumé

By grafting TaMe5 on Aerosil(700), a stable, well-defined, silica-supported tetramethyl tantalum(V) complex, [( SiO)TaMe4], is obtained on the silica surface. After thermal treatment at 150 degrees C, the complex is transformed into two surface tantalum methylidenes, [( SiO)(2)Ta(-CH2)Me] and [( SiO)Ta(-CH2)Me-2], which are active in alkane metathesis and comparable to the previously reported [( SiO)(2)TaHx]. Here we present the first experimental study to isolate and identify a surface tantalum carbene as the intermediate in alkane metathesis. A systematic experimental study reveals a new reasonable pathway for this reaction.
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hal-01187414 , version 1 (26-08-2015)

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Yin Chen, Edy Abou-Hamad, Ali Hamieh, Bilel Hamzaoui, Lyndon Emsley, et al.. Alkane metathesis with the tantalum methylidene [( SiO)Ta(=CH2)Me-2]/[( SiO)(2)Ta(=CH2)Me] generated from well-defined surface organometallic complex [( SiO)(TaMe4)-Me-V]. Journal of the American Chemical Society, 2015, 137 (2), pp.588-591. ⟨10.1021/ja5113468⟩. ⟨hal-01187414⟩
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