[C:1]1([NH2:8])[CH:6]=[CH:5][CH:4]=[CH:3][C:2]=1[NH2:7].C1(C)C(C)=CC=CC=1.[C:17]([CH2:25][C:26](S)=[S:27])(=O)[C:18]1[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=1.O1CCOCC1>O>[C:18]1([C:17]2[CH2:25][C:26](=[S:27])[NH:8][C:1]3[CH:6]=[CH:5][CH:4]=[CH:3][C:2]=3[N:7]=2)[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=1A mixture of 1.08 g of o-phenylendiamine, 10 ml of xylene and 1.96 g of benzoyldithioacetic acid (Thuillier et al - Bull. Soc. Chim. Fr. 1938 (1959) is refluxed for 1 hour under a stream of nitrogen. The reaction may also be carried out in water, alcohol or dioxane. After cooling, the precipitate is filtered, washed with ethyl ether, and crystallized from ethyl acetate. Yield 2 g, m.p. 228°-230°C.
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