[CH3:1][N-:2][CH3:3].[C:4]1([S:10][CH:11]([C:15]2[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=2)[C:12](O)=O)[CH:9]=[CH:8][CH:7]=[CH:6][CH:5]=1.O=P(Cl)(Cl)Cl.N>C1(C)C=CC=CC=1.O>[CH3:1][N:2]([CH3:3])[C:12]1[C:5]2[CH:6]=[CH:7][CH:8]=[CH:9][C:4]=2[S:10][C:11]=1[C:15]1[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=1A solution of 14.4 g (53 mmole) of the dimethylamide of α-phenylthio-phenylacetic acid, 24.5 milliliters (160 mmole) of POCl3 in 250 milliliters of absolute toluene is refluxed for 6 hours. After mixing with water, it is neutralised with ammonia and the organic phase is dried over a mixture of K2CO3 and activated charcoal and evaporated: 3-dimethylamino-2-phenyl-benzo(b)thiophene in the form of a crude oily produce which, triturated with methanol, yields 11.1 g (83% of theory) of colourless rods, mp 84°-85° (methanol).
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