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To a solution of 600 mg of (2RS)-2-cyclopentyl-2-methyl-5-hydroxy-6,7-dichloroindan-1-one (prepared by the method described in European Patent Publication No. 47011) in 6 ml of dry acetone was added 690 mg of potassium carbonate at a time and the mixture was stirred for twenty minutes. The reaction mixture was cooled to 0° C., 0.23 ml of trifluoromethanesulfonyl chloride was dropped thereto and the mixture was stirred for 10 minutes at the same temperature. The solid was filtered out from the reaction mixture and the filtrate was concentrated under reduced pressure. The obtained residue was dissolved in methylene chloride and the solution was dried over anhydrous magnesium sulfate and concentrated under reduced pressure to give 860 mg of the title compound as crude product having the following physical data.

1. stirringthe mixture was stirred for 10 minutes at the same temperature
2. filtrationThe solid was filtered out from the reaction mixture
3. concentrationthe filtrate was concentrated under reduced pressure
4. dissolutionThe obtained residue was dissolved in methylene chloride
5. dry with materialthe solution was dried over anhydrous magnesium sulfate
6. concentrationconcentrated under reduced pressure