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26. Oxidative hydroxylation of heterocyclic β-dicarbonylcompounds
Stadlbauer W., Kappe Th. Monatsh. Chem. 116 (1985) 1005-1015

Abstract: 3-Substituted 4-hydroxy-2-quinolones (1), 5-substituted barbituric acids (3) and 4-substituted pyrazolidine-2,4-diones were oxidized to yield the corresponding hydroxy derivatives 2, 4 or 9, respectively.


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