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

The new molybdenum imido alkylidene complex Mo­(N­(2,6-<i>i</i>Pr₂C₆H₃))­(CHCMe₂Ph)­(NC₄H₂Me₂)­(OB­(Mes)₂) (<b>1</b>;<b> </b>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-<i>i</i>Pr₂C₆H₃)­(CHCMe₂Ph)­(NC₄H₂Me₂)₂. The complex was fully characterized by ¹H, ¹³C, ¹¹B, and ⁹⁵Mo NMR spectroscopy, X-ray diffraction, and elemental analysis. Complex <b>1</b> 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