[C:1]1([N:7]=[C:8]=[S:9])[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.[C:10]1([S:16][CH2:17][C:18]#[N:19])[CH:15]=[CH:14][CH:13]=[CH:12][CH:11]=1.[H-].[Na+].Br[CH2:23][CH2:24]Br>CN(C)C=O.CCOCC.O>[C:10]1([S:16][C:17](=[C:8]2[N:7]([C:1]3[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=3)[CH2:24][CH2:23][S:9]2)[C:18]#[N:19])[CH:15]=[CH:14][CH:13]=[CH:12][CH:11]=118.9 g (140 mmols) of phenylisothiocyanate and 20.9 g (140 mmols) of phenylthioacetonitrile dissolved in 50 ml of dimethylformamlde were added dropwise with stirring at room temperature to a suspension of 11.5 g of sodium hydride (60% oil, 287 mmols) in 200 ml of dimethylformamide. The mixture was stirred for 1 hour, and 28.9 g (154 mmols) of 1,2-dibromoethane was added dropwise at room temperature. Then the mixture was stirred for 3 hours. To the reaction mixture were added 300 ml of water and 100 ml of ether, followed by stirring. The precipitated crystals were collected by filtration, giving 26.1 g of the title compound as colorless crystals (yield 60%).
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