Alkane metathesis with the tantalum methylidene [(≡SiO)Ta(=CH2)Me2]/[(≡SiO)2Ta(=CH2)Me] generated from well-defined surface organometallic complex [(≡SiO)TaVMe4]
Hamieh, Ali Imad Ali
KAUST DepartmentChemical Science Program
KAUST Catalysis Center (KCC)
KAUST Solar Center (KSC)
Physical Sciences and Engineering (PSE) Division
Upstream Petroleum Engineering Research Center (UPERC)
Permanent link to this recordhttp://hdl.handle.net/10754/575636
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AbstractBy 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.
SponsorsWe thank KAUST for the generous financial support. This paper is dedicated to Yves Chauvin.
PublisherAmerican Chemical Society (ACS)
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