Molybdenum Imido Alkylidene Complexes Containing N- and C‑Chelating N‑Heterocyclic Carbenes
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https://figshare.com/articles/dataset/Molybdenum_Imido_Alkylidene_Complexes_Containing_N-_and_C_Chelating_N_Heterocyclic_Carbenes/4452584
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资源简介：
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 imido alkylidene complexes highly stable
and in ultimate consequence mostly inactive in olefin metathesis even
at elevated temperatures. Notably, the molybdenum imido alkylidene
complex Mo(N-2,6-Me2-C6H3)(CHCMe2Ph)(1-mesityl-3-(C9H11)-imidazol-2-ylidene)(OTf)
(9) with a C-chelating NHC formed via C–H activation
and was isolated in 76% yield.
创建时间：
2016-12-15
