C(O)C.[Cl:4][C:5]1[C:10]([CH3:11])=[C:9](Br)[CH:8]=[C:7]([S:13]([CH3:16])(=[O:15])=[O:14])[C:6]=1[CH3:17].C([O-])(=O)C.[Na+].[H][H]>[Pd].O>[Cl:4][C:5]1[C:6]([CH3:17])=[C:7]([S:13]([CH3:16])(=[O:15])=[O:14])[CH:8]=[CH:9][C:10]=1[CH3:11]30 ml of ethanol was added to 1.0 g of the crude 2-chloro-4-bromo-6-methylsulfonyl-m-xylene obtained in Example 2, and 0.1 g of 5% palladium active carbon and 1.0 g of anhydrous sodium acetate were further added thereto. The reactor was sealed, and was substituted with hydrogen, then stirring at room temperature for 7 hours. 30 ml of water was added to the reaction liquor, and was concentrated under reduced pressure. 30 ml of EDC was further added thereto, and the resultant mixture was filtered. The EDC layer was taken out from the filtrate, and was washed with 20 ml of water and then with 10 ml of a saturated aqueous solution of common salt, and was dried over anhydrous sodium sulfate. The EDC layer thus obtained was concentrated under reduced pressure and was dried to a solid to obtain 0.7 g of a crude product of the above-identified aimed compound (purity measured by gas chromatography: 75.6%). The crude product thus obtained was recrystallized by methanol to obtain the above-identified aimed compound.
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