[C:1]([N:5]1[C:10](=[O:11])[C:9]([CH3:12])=[C:8]([SH:13])[CH:7]=[N:6]1)([CH3:4])([CH3:3])[CH3:2].CI.[C:16](=O)([O-])[O-].[Na+].[Na+].O>CN(C)C=O>[C:1]([N:5]1[C:10](=[O:11])[C:9]([CH3:12])=[C:8]([S:13][CH3:16])[CH:7]=[N:6]1)([CH3:4])([CH3:2])[CH3:3]The crude product 2.0 g (0.01 mol) of 2-tert.-butyl-5-mercapto-4-methyl-3(2H)-pyridazinone as synthesized in the above and 1.4 g (0.01 mol) of methyl iodide were dissolved in 20 ml of dimethylformamide and then added with 2.0 g of sodium carbonate with stirring at room temperature. The reaction liquid was stirred for 3 hours at 70° C. After allowing to cool the reaction liquid was poured into 200 ml of water and extracted with 50 ml of benzene. The benzene layer was washed successively with 50 ml of 10% sodium hydroxide, 50 ml of 1N hydrochloric acid and 100 ml of water, dried over anhydrous sodium sulfate and freed of solvent by distillation to give 2.0 g of a crude product. The crude product was recrystallized from 20 ml of isopropyl ether to give 1.4 g of 2-tert.-butyl-4-methyl-5-methylthio-3(2H)-pyridazinone.
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