[NH2:1][C:2]1[C:7]([NH2:8])=[CH:6][CH:5]=[CH:4][C:3]=1[N+:9]([O-:11])=[O:10].[C:12]1([C:18]([C:20]([C:22]2[CH:27]=[CH:26][CH:25]=[CH:24][CH:23]=2)=O)=O)[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=1>C(O)(=O)C.CO>[C:12]1([C:18]2[C:20]([C:22]3[CH:23]=[CH:24][CH:25]=[CH:26][CH:27]=3)=[N:1][C:2]3[C:7](=[CH:6][CH:5]=[CH:4][C:3]=3[N+:9]([O-:11])=[O:10])[N:8]=2)[CH:17]=[CH:16][CH:15]=[CH:14][CH:13]=11.53 g (10 mmol) of 2,3-diaminonitrobenzene and 2.00 g (9.6 mmol) of benzil were placed in a four-necked flask, and were dissolved by adding a 1:1 mixed solvent of acetic acid/methanol thereto. Thereafter, reaction was allowed at 70° C. for 2 hr. After the reaction, the solvent was removed, and the reaction product was extracted on a silica gel column (ethyl acetate:hexane=1:1).
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