Chapter 19: Vanadium-induced Oxidative and Reductive Coupling
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Published:05 Nov 2020
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Special Collection: 2020 ebook collectionSeries: Catalysis Series
T. Amaya and T. Hirao, in Vanadium Catalysis, ed. M. Sutradhar, A. J. L. Pombeiro, and J. A. L. da Silva, The Royal Society of Chemistry, 2020, ch. 19, pp. 464-482.
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One-electron oxidation capability with Lewis acidity of oxovanadium(v) compounds allows oxidative carbon–carbon bond formation. A combination of boron enolate and silyl enol ether is effective for the selective cross-oxidative coupling. Ligand-coupling reactions, which are coupling reactions of organic substituents on main-group organometallic compounds, are also induced by oxidation with oxovanadium(v) compounds. As main-group metals, Al, Zn, B, etc., can be used in these reactions. Low-valent vanadiums or titaniums contribute to reductive coupling reactions as a catalyst, as exemplified by pinacol coupling reaction, which requires the presence of chlorosilane and co-reductant, zinc. Use of an heterobimetallic catalyst consisted of vanadium and titanium permits the selective cross-coupling between aryl and aliphatic aldehydes.