[CH2:1]1[C:9]2[C:4](=[CH:5][CH:6]=[CH:7][CH:8]=2)[C:3]([CH2:10][CH2:11][OH:12])=[CH:2]1.[CH3:13][C:14]1[CH:19]=[CH:18][C:17]([S:20](Cl)(=[O:22])=[O:21])=[CH:16][CH:15]=1.Cl>N1C=CC=CC=1>[CH3:13][C:14]1[CH:19]=[CH:18][C:17]([S:20]([O:12][CH2:11][CH2:10][C:3]2[C:4]3[C:9](=[CH:8][CH:7]=[CH:6][CH:5]=3)[CH2:1][CH:2]=2)(=[O:22])=[O:21])=[CH:16][CH:15]=15 g (0.031 mol) of 1H-indene-3-ethanol are dissolved in 50 ml of dry pyridine. The mixture is stirred and cooled using an ice bath, 5.9 g (0.031 mol) of 4-methylbenzenesulphonyl chloride are added in portions, and stirring is continued under cold conditions for 1 h and then at room temperature for 4 h. The solution obtained is poured into a mixture of 100 ml of 10N hydrochloric acid and 200 g of ice. The mixture is extracted twice with diethyl ether, and the organic phase is separated, washed with water, dried over magnesium sulphate and filtered. The filtrate is evaporated under reduced pressure. 7 g of an oily product are obtained which is used as it is in the following step.
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