Isolation and characterization of tautomeric forms of 2,4-diacetyl-3-(<Emphasis Type="Italic">o</Emphasis>-R-aryl)-5-hydroxy-5-methylcyclohexanones

Keto-enol prototropic tautomerism of 2,4-diacetyl-3-(o-R-aryl)-5-hydroxy-5-methylcyclohexanones in the -diketone fragment was studied. Individual tautomeric forms of -diketones, viz., keto and enol forms, were isolated and characterized. The latter are generated through enolization of the alicyclic carbonyl group. Enolization is facilitated by the presence of an ortho substituent in the benzene ring.__________Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 12, pp. 2670–2674, December, 2004.