Chemical Science · 2022 · 10 citations · 57 references
Cationic d<sup>0</sup> group 6 olefin metathesis catalysts have been recently shown to display in most instances superior activity in comparison to their neutral congeners. Furthermore, their catalytic performance is greatly improved upon immobilization on silica. In this context, we have developed the new family of molecular cationic molybdenum oxo alkylidene complexes stabilized by N-heterocyclic carbenes of the general formula [Mo(O)(CHCMe<sub>3</sub>)(IMes)(OR)[X<sup>-</sup>]] (IMes = 1,3-dimesitylimidazol-2-ylidene; R = 1,3-dimesityl-C<sub>6</sub>H<sub>3</sub>, C<sub>6</sub>F<sub>5</sub>; X<sup>-</sup> = B(3,5-(CF<sub>3</sub>)<sub>2</sub>C<sub>6</sub>H<sub>3</sub>)<sub>4</sub> <sup>-</sup>, B(Ar<sup>F</sup>)<sub>4</sub>, tetrakis(perfluoro-<i>t</i>-butoxy)aluminate (PFTA)). Immobilization of [Mo(O)(CHCMe<sub>3</sub>)(IMes)(O-1,3-dimesityl-C<sub>6</sub>H<sub>3</sub>)<sup>+</sup>B(Ar<sup>F</sup>)<sub>4</sub> <sup>-</sup>] on silica <i>via</i> surface organometallic chemistry yields an active alkene metathesis catalyst that shows the highest productivity towards terminal olefins amongst all existing molybdenum oxo alkylidene catalysts.
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Anthony W. Addison, T. Nageswara Rao, J. Reedijk et al. · Journal of the Chemical Society Dalton Transactions · 1984 · 9.2K citations
Inorganic Chemistry, Chemical Engineering, Spectroscopic Properties +10
Gregory R. Fulmer, Alexander J. M. Miller, Nathaniel H. Sherden et al. · Organometallics · 2010 · 3.8K citations