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• W2531464555 abstract "We propose a novel mechanism for the deoxydehydration (DODH) reaction of glycols catalyzed by a [Bu4N][VO2(dipic)] complex (dipic = pyridine-2,6-dicarboxylate) using triphenylphosphine as a reducing agent. Using density functional theory, we have confirmed that the preferred sequence of reaction steps involves reduction of the V(V) complex by phosphine, followed by condensation of the glycol into a [VO(dipic)(-O-CH2CH2-O-)] V(III) complex (6), which then evolves to the alkene product, with recovery of the catalyst. In contrast to the usually invoked closed-shell mechanism for the latter steps, where 6 suffers a [3+2] retrocycloaddition, we have found that the homolytic cleavage of one of the C-O bonds in 6 is preferred by 12 kcal/mol. The resulting diradical intermediate then collapses to a metallacycle that evolves to the product through an aromatic [2+2] retrocycloaddition. We use this key change in the mechanism to propose ways to design better catalysts for this transformation. The analysis of the mechanisms in both singlet and triplet potential energy surfaces, together with the location of the MECPs between them, showcases this reaction as an interesting example of two-state reactivity." @default.
• W2531464555 created "2016-10-21" @default.
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• W2531464555 date "2016-10-14" @default.
• W2531464555 modified "2023-10-16" @default.
• W2531464555 title "A Radical Mechanism for the Vanadium-Catalyzed Deoxydehydration of Glycols" @default.
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• W2531464555 doi "https://doi.org/10.1021/acs.inorgchem.6b01916" @default.
• W2531464555 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/27740760" @default.
• W2531464555 hasPublicationYear "2016" @default.
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