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• W2152922591 abstract "The detailed syntheses of complexes 1–4, Re(O)(X)(DAP) (X = Me, 1; Cl, 2; I, 3; OTf (triflate), 4) incorporating the diamido pyridine (DAP) ancillary ligand (2,6-bis((mesitylamino)methyl)pyridine) are described and shown to be effective catalysts for oxygen atom transfer (OAT) reactions of PyO to PPh3. The catalytic activities are as follows: 4 ≈ 3 > 2 > 1. The observed electronic trend is consistent with the turnover limiting reduction of the proposed Re(VII) dioxo intermediate, Re(O)2(X)(DAP), during the catalytic cycle. The catalytic activity of complexes 1–3 was compared to previously published diamido amine (DAAm) oxorhenium complexes of the type Re(O)(X)(DAAm) (X = Me, 5; Cl, 6; I, 7 and DAAm = N,N-bis(2-arylaminoethyl)methylamine) which exhibit hydrolytic degradation during the catalytic reaction. Complexes 1–3 displayed higher turnover frequencies compared to 5–7. This higher catalytic activity was attributed to the more rigid DAP ligand backbone, which makes the complexes less susceptible to decomposition. However, another decomposition pathway was proposed for this catalytic system due to the observation of Re(O)3((MesNCH2)(MesNCH)NC5H3) 8 in which one arm of the DAP ligand is oxidized." @default.
• W2152922591 created "2016-06-24" @default.
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• W2152922591 date "2011-01-01" @default.
• W2152922591 modified "2023-10-18" @default.
• W2152922591 title "Synthesis and characterization of oxorhenium(v) diamido pyridine complexes that catalyze oxygen atom transfer reactions" @default.
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• W2152922591 doi "https://doi.org/10.1039/c1dt11143d" @default.
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