[CH3:1][O:2][C:3]1[C:11]2[CH2:10][CH2:9][CH2:8][C:7]=2[C:6](C=O)=[CH:5][C:4]=1[CH3:14].[OH:15]O>CO.S(=O)(=O)(O)O>[CH3:1][O:2][C:3]1[C:11]2[CH2:10][CH2:9][CH2:8][C:7]=2[C:6]([OH:15])=[CH:5][C:4]=1[CH3:14]The stirred solution of 7-methoxy-6-methyl-indan-4-carbaldehyde (1.0 gm, 0.0060 mole) in Methanol (20 ml), Sulphuric acid (0.6 ml) was added at room temperature. To the reaction mixture, 30% Hydrogen peroxide (1.6 ml) was added and stirred for 1 hour at 0° C. Methanol was distilled under vacuum and the residue was dissolved in Ethylacetate (50 ml), further ethyl acetate layer was washed with water and evaporated to give a crude product, which upon triturating with Hexane give 600 mg title compound as a solid.
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