P([O-])(O)(O)=O.[K+].[OH-:7].[Na+].[CH3:9][CH:10]([CH:13]([C:15]1[O:16][CH:17]=[CH:18][CH:19]=1)O)[CH:11]=[CH2:12].[Cl-].[Na+]>O>[CH3:9][CH:10]([C:13]1[C:15](=[O:16])[CH2:19][CH:18]([OH:7])[CH:17]=1)[CH:11]=[CH2:12]Water (500 ml) and potassium dihydrogenphosphate (2.0 g) were placed in an autoclave, and the mixture was adjusted to pH 5.1 with an aqueous 1N NaOH solution at 30° C. α-Methylallyl-2-furylcarbinol (15 g) was then added, and the mixture was heated at 150° C. for 5.5 hours while stirring. After cooling, the reaction mixture was adjusted to pH 7.1 with an aqueous 1N NaOH solution at 30° C. and re-heated at 150° C. for 5 hours while stirring. After completion of the reaction, the mixture was admixed with sodium chloride (10 g) and extracted with methyl isobutyl ketone. The solvent was removed from the reaction mixture, and distillation of the resulting residue gave 2-(α-methylallyl)-4-hydroxy-2-cyclopentenone with the yield of 12 g (80%). B.P., 88°-90° C./0.12 mmHg.
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