om400577k_si_002.cif (40.16 kB)

New Boron-Containing Molybdenum Imido Alkylidene Complexes for Linear Olefin Homometathesis

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posted on 14.10.2013, 00:00 by Alexandre Nasr, Pierre-Alain R. Breuil, Duarte C. Silva, Mikaël Berthod, Nicolas Dellus, Erwann Jeanneau, Marc Lemaire, Hélène Olivier-Bourbigou
The new molybdenum imido alkylidene complex Mo­(N­(2,6-iPr2C6H3))­(CHCMe2Ph)­(NC4H2Me2)­(OB­(Mes)2) (1; Mes = 2,4,6-MePh) containing both boroxide and pyrrolide ligands is reported. Its formation results from the reaction between bis­(mesityl)­borinic acid ((Mes)2BOH) and the bis-pyrrolide Schrock-type precursor Mo­(N-2,6-iPr2C6H3)­(CHCMe2Ph)­(NC4H2Me2)2. The complex was fully characterized by 1H, 13C, 11B, and 95Mo NMR spectroscopy, X-ray diffraction, and elemental analysis. Complex 1 proved to be active for homometathesis reactions of 1- and 2-octene at 0.1 mol % loading. The synthesis of mixed pyrrolide boroxide imido molybdenum alkylidene complexes was extended to other borinic acids. The catalytic activity of these new complexes was evaluated in the homometathesis of linear olefins.