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Issue 44, 2011
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Synthesis and characterization of oxorhenium(v) diamido pyridine complexes that catalyze oxygen atom transfer reactions

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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: 43 > 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.

Graphical abstract: Synthesis and characterization of oxorhenium(v) diamido pyridine complexes that catalyze oxygen atom transfer reactions

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Supplementary files

Article information


Submitted
17 Jun 2011
Accepted
15 Aug 2011
First published
04 Oct 2011

Dalton Trans., 2011,40, 11815-11821
Article type
Paper

Synthesis and characterization of oxorhenium(V) diamido pyridine complexes that catalyze oxygen atom transfer reactions

C. P. Lilly, P. D. Boyle and E. A. Ison, Dalton Trans., 2011, 40, 11815 DOI: 10.1039/C1DT11143D

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