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Then, 8.00 g of (4-(trifluoromethylthio)benzylidene)malononitrile and 3.35 g of benzaldehyde were dissolved in 320 ml of ethanol, and while stirring at room temperature, 3.41 g of phenylenediamine was slowly added, and the mixture was stirred at room temperature for 5 hours. Then, the reaction mixture was concentrated, 300 ml of t-butyl methyl ether was added, and insoluble matters were filtered. The filtrate was concentrated and the resulting residue was subjected to silica gel chromatography to give 6.22 g of (4-(trifluoromethylthio)benzyl)malononitrile (the intermediate (14)).

1. stirringthe mixture was stirred at room temperature for 5 hours
2. concentrationThen, the reaction mixture was concentrated
3. addition300 ml of t-butyl methyl ether was added
4. filtrationinsoluble matters were filtered
5. concentrationThe filtrate was concentrated