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3-Benzoyl-7-dimethylamino-4-hydroxycoumarin was synthesized and its UV–vis spectra in various mixtures of MeOH and CH2Cl2 were measured. The diketone lactone exists mainly in the exocyclic-enol form in protic solvents and the endocyclic-enol form in nonpolar solvents. Acetylation, amination and methylation products of the diketone lactone were characterized by X-ray crystallography. The results indicated...
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