[C:1]1(=[O:10])[C:9]2[C:4](=[CH:5][CH:6]=[CH:7][CH:8]=2)[CH2:3][CH2:2]1.[C:11]([C:14]1[CH:21]=[CH:20][C:17]([CH:18]=O)=[CH:16][CH:15]=1)([OH:13])=[O:12].[OH-].[K+]>CCO>[O:10]=[C:1]1[C:9]2[C:4](=[CH:5][CH:6]=[CH:7][CH:8]=2)[CH2:3][C:2]1=[CH:18][C:17]1[CH:20]=[CH:21][C:14]([C:11]([OH:13])=[O:12])=[CH:15][CH:16]=1To a suspension of indanone (2.00 g, 15.1 mmol) and 4-carboxybenzaldehyde (1.89 g, 12.6 mmol) in EtOH (10 ml) was added KOH (1.77 g, 31.5 mmol) at 0° C. The reaction mixture was stirred 30 min at 0° C. then at room temperature for 16 h. The solvent was evaporated and the residue was dissolved in water, acidified to pH 5 with HCl 1 M. The precipitate was filtered and rinsed with water to afford the title compound 273 (2.27 g, 57%) as a yellow solid. LPMS: 264.1 (Calc.); 265.0 (found).
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