Abstract
Six molybdenum imido alkylidene complexes bearing an N-chelating N-heterocyclic carbene (NHC), i.e., Mo(N-2,6-Me2-C6H3)(CHCMe2Ph)(1-(2-pyridyl)methylene-3-mesitylimidazol-2-ylidene)(OTf)2 (1), Mo(N-2,6-Me2-C6H3)(CHCMe2Ph)(1-(2-pyridyl)methylene-3-mesitylimidazol-2-ylidene)(OTf)(OC6F5) (3), Mo(N-2,6-Me2-C6H3)(CHCMe2Ph)(1-(2-pyridyl)methylene-3-mesitylimidazol-2-ylidene)(OTf)(OCMe3) (4), and their cationic counterparts [Mo(N-2,6-Me2-C6H3)(CHCMe2Ph)(1-(2-pyridyl)methylene-3-mesitylimidazol-2-ylidene)(OTf)]B(ArF)4 (2), [Mo(N-2,6-Me2-C6H3)(CHCMe2Ph)(1-(2-pyridyl)methylene-3-mesitylimidazol-2-ylidene)(OC6F5)]B(ArF)4 (5), and [Mo(N-2,6-Me2-C6H3)(CHCMe2Ph)(1-(2-pyridyl)methylene-3-mesitylimidazol-2-ylidene)(OCMe3)]B(ArF)4 (6), have been prepared. The influence of the alkoxide ligand on the loss of triflate in the hexacoordinated complexes 1, 3, and 4 resulting in the corresponding cationic complexes was studied. The 2-pyridyl-donor-functionalized NHC ligand renders the high oxidation state cationic molybdenum imi...
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