[CH2:1]([C:3]1[CH:8]=[C:7]([CH3:9])[CH:6]=[C:5]([CH2:10][CH3:11])[C:4]=1[C:12]1[C:13](=[O:23])[N:14]([CH3:22])[N:15]=[C:16]([CH3:21])[C:17]=1S(C)=O)[CH3:2].CS(C)=[O:26].[OH-].C([N+](CCCC)(CCCC)CCCC)CCC.Cl>O>[CH2:1]([C:3]1[CH:8]=[C:7]([CH3:9])[CH:6]=[C:5]([CH2:10][CH3:11])[C:4]=1[C:12]1[C:13](=[O:23])[N:14]([CH3:22])[N:15]=[C:16]([CH3:21])[C:17]=1[OH:26])[CH3:2]To a 50 ml volume three-necked flask, 4-(2,6-diethyl-4-methylphenyl)-2,6-dimethyl-5-methylsulfinyl-2,3-dihydro-3-pyridazinone ((2-19)-(1)-39) (0.60 g), DMSO (2.73 ml), and 10% of aqueous tetra-n-butylammonium hydroxide solution (9.4 g) were added under a nitrogen atmosphere, and stirred at 90° C. for 2 hours. The reaction mixture was added to water and hydrochloric acid was added to adjust pH to less than 2. The resulting mixture was extracted with ethyl acetate. The organic layer was dried over anhydrous sodium sulfate and concentrated under reduced pressure. The residue was subjected to silica gel column chromatography (chloroform) to give 0.33 g of 4-(2,6-diethyl-4-methylphenyl)-5-hydroxy-2,6-dimethyl-2,3-dihydro-3-pyridazinone ((1-4)-(1)-39).
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