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A Well-Defined, Silica-Supported Tungsten Imido Alkylidene Olefin Metathesis Catalyst

  • Author(s): Rhers, Bochra;
  • Salameh, Alain;
  • Baudouin, Anne;
  • Quadrelli, Elsje A.;
  • Taoufik, Mostafa;
  • Coperet, Christophe;
  • Lefebvre, Frederic;
  • Basset, Jean-Marie;
  • Solans-Monfort, Xavier;
  • Eisenstein, Odile;
  • Lukens, Wayne W.;
  • Lopez, Lordes.P.H.;
  • Sinha, Amritanshu;
  • Schrock, Richard R.
  • et al.
Abstract

The reaction of [W(=NAr)(=CHtBu)(CH2tBu)2] (1; Ar = 2,6-iPrC6H3) with a silica partially dehydroxylated at 700oC, SiO2-(700), gives syn-[(_SiO)W(=NAr)(=CHtBu)(CH2tBu)] (2) as a major surface species, which was fully characterized by mass balance analysis, IR, NMR, EXAFS, and DFT periodic calculations. Similarly, complex 1 reacts with [(c-C5H9)7Si7O12SiOH] to give [(SiO)W(=NAr)(=CHtBu)(CH2tBu)] (2m), which shows similar spectroscopic properties. Surface complex 2 is a highly active propene metathesis catalyst, which can achieve a TON of 16000 within 100 h, with only a slow deactivation.

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