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Abstract
The tautomerism in 2-benzoyl-4-phenacyl-1,3-cyclopentanedione has been studied through an investigation of the solvent and pH dependence of the equilibrium using UV spectrophotometry. The first derivative spectrophotometric technique has been applied for the determination of the ratio of monoenol form in tautomeric mixtures. The results showed that in DMF solution 2-benzoyl-4-phenacyl-1,3-cyclopentane-dione exist only in non-hydrogen-bonded monoenol form while in less polar solvents the predominance of helated dienol form was established.