[CH3:1][O:2][C:3]1[C:11]([CH:12]=[O:13])=[CH:10][CH:9]=[C:8]2[C:4]=1[CH2:5][CH2:6][CH2:7]2.S(=O)(=O)([OH:16])N.Cl([O-])=O.[Na+]>ClCCl.O>[CH3:1][O:2][C:3]1[C:11]([C:12]([OH:16])=[O:13])=[CH:10][CH:9]=[C:8]2[C:4]=1[CH2:5][CH2:6][CH2:7]2To a clear solution of 4-Methoxy-indan-5-carbaldehyde (11.5 gm, 0.065 mole) in Dichloromethane (100 ml), Sulphamic acid (19.0 gm, 0.196 mole) was added at 25-28°. A solution of Sodium chlorite (15.28 gm, 0.169 mole) in water (50 ml) was added at 5-10° C. The reaction mixture was stirred for 5 hours at 25-28° C. Finally the reaction mixture was poured into water (200 ml) and extracted with Dichloromethane (2×200 ml). The organic layer was dried over Sodium sulphate, distilled under vacuum to give 12.0 gm of desired product as a viscous oil.
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