Journal
NEW JOURNAL OF CHEMISTRY
Volume 27, Issue 2, Pages 329-332Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/b210978f
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The oxidation of ethers of various structure by O-2 with two laccase/dropN-OH systems (i.e., HBT, 1-hydroxybenzotriazole, and HPI, N-hydroxyphthalimide) is described. The process affords carbonylic products in reasonable-to-good yields. The oxidation is carried out by the intermediate dropN-O. species of the mediators, through a radical H-atom abstraction (HAT) route that represents an elaboration of the HAT route followed with benzyl alcohols. Alternative mechanisms have been considered and dismissed. A comparison with a similar oxidation of ethers by the laccase/TEMPO system, reported previously, is made. A clear-cut specialisation of the mediator vs. the substrate emerges, i.e. the laccase/HBT system is more competent for the oxidation of ethers, whereas the laccase/TEMPO system was most proficient in the oxidation of benzyl alcohols.
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