O=P(Cl)(Cl)Cl.CN([CH:9]=[O:10])C.[CH3:11][C:12]1[S:13][CH:14]=[CH:15][C:16]=1[C:17]1[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=1.C([O-])(=O)C.[Na+]>O>[CH:9]([C:14]1[S:13][C:12]([CH3:11])=[C:16]([C:17]2[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=2)[CH:15]=1)=[O:10]0.166 mol (15 mL) of POCl3 was added at 0° C. to a 0.5 mol (39 mL) of DMF. At the end of the addition, the mixture was allowed to warm to room temperature and stirred for 1 h. Then it was cooled again to 0° C. and treated with 2-methyl-3-phenylthiophene (29 g, 0.166 mol). The resulting reaction mixture was allowed to reach room temperature and after 12 h stirring at the same temperature was heated at 80° C. for 2 days. Then it was poured into a mixture of ice and water and added of sodium acetate. The precipitate so obtained was filtered, washed with water and subsequently with hexane. The yellow powder was dried in vacuo.
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