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Alkane metathesis with the tantalum methylidene [(≡SiO)Ta(═CH2)Me2]/[(≡SiO)2Ta(═CH2)Me] generated from well-defined surface organometallic complex [(≡SiO)Ta(V)Me4].

Authors
  • Chen, Yin1
  • Abou-hamad, Edy
  • Hamieh, Ali
  • Hamzaoui, Bilel
  • Emsley, Lyndon
  • Basset, Jean-Marie
  • 1 Physical Sciences and Engineering, KAUST Catalysis Center, King Abdullah University of Science and Technology (KAUST) , Thuwal 23955-6900, Saudi Arabia. , (Saudi Arabia)
Type
Published Article
Journal
Journal of the American Chemical Society
Publisher
American Chemical Society
Publication Date
Jan 21, 2015
Volume
137
Issue
2
Pages
588–591
Identifiers
DOI: 10.1021/ja5113468
PMID: 25557135
Source
Medline
License
Unknown

Abstract

By grafting TaMe5 on Aerosil700, a stable, well-defined, silica-supported tetramethyl tantalum(V) complex, [(≡SiO)TaMe4], is obtained on the silica surface. After thermal treatment at 150 °C, the complex is transformed into two surface tantalum methylidenes, [(≡SiO)2Ta(═CH2)Me] and [(≡SiO)Ta(═CH2)Me2], which are active in alkane metathesis and comparable to the previously reported [(≡SiO)2TaHx]. 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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