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• W2045249570 abstract "Hydroxylation of benzene to phenol in the [(CH3)4N]4PMo11VO40/ascorbic acid/TEMPO/O2 catalytic system was carefully investigated. UV–vis, ESR and 1H NMR studies showed ascorbic acid radicals were formed through the hydrogen exchange of ascorbic acid with TEMPO (2,2,6,6-tetramethyl-1-piperidine-N-oxyl radicals) during the reaction. In acetonitrile, the ascorbic acid would be partly oxidized to 2-hydroxy-2-buten-4-olide (α-tetronic acid, isotetronic acid, compound 1) without TEMPO. The interaction of TEMPO and ascorbic acid restrained the oxidative dissociation of ascorbic acid and promoted the rate of the hydroxylation. Aqueous acetic acid solvent can also restrain the oxidative dissociation of ascorbic acid. In aqueous acetic acid, the yield of phenol could reach 18.9% in the [(CH3)4N]4PMo11VO40/ascorbic acid/TEMPO/O2 catalytic system with sufficient ascorbic acid after 400 min." @default.
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• W2045249570 date "2012-02-01" @default.
• W2045249570 modified "2023-10-16" @default.
• W2045249570 title "The effect of TEMPO in the hydroxylation of benzene to phenol on the [(CH3)4N]4PMo11VO40/ascorbic acid/TEMPO/O2 catalytic system: Formation of ascorbic acid radicals through hydrogen exchange of ascorbic acid and TEMPO" @default.
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• W2045249570 doi "https://doi.org/10.1016/j.apcata.2011.11.032" @default.
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