[OH-].[Na+].[N+:3]([C:6]1[CH:11]=[CH:10][CH:9]=[CH:8][C:7]=1[N:12]=[N:13][C:14]1[CH:19]=[C:18]([CH3:20])[CH:17]=[CH:16][C:15]=1[OH:21])([O-])=[O:4].C1(C=CC(O)=CC=1)O.O=C[C@@H]([C@H]([C@@H]([C@@H](CO)O)O)O)O.N(C1C=CC=CC=1)=NC1C=CC=CC=1.S(=O)(=O)(O)O>C1(C)C=CC=CC=1.O>[OH:21][C:15]1[CH:16]=[CH:17][C:18]([CH3:20])=[CH:19][C:14]=1[N:13]1[N+:3]([O-:4])=[C:6]2[CH:11]=[CH:10][CH:9]=[CH:8][C:7]2=[N:12]1Example 5 of EP 0,257,151 is duplicated. Water (70 ml), 97% sodium hydroxide (5.2 g), 2-nitro-2'-hydroxy-5'-methylazobenzene (12.9 g) and toluene (10 ml) are mixed and heated to 60° C. After stirring, hydroquinone (0.6 g) is added, and glucose (5.0 g) is added to the mixture over one hour at 40° to 45° C. The mixture is further stirred two hours, and the azobenzene disappears. The reaction liquor is neutralized with 62% sulfuric acid (5.8 g), and is cooled to 20° C. to precipitate a crystal. The crystal thus precipitated is separated filtration to obtain a wet product 12 g of 2-(2'-hydroxy-5'-methylphenyl)benzotriazole-N-oxide (dry weight 10.8 g, yield: 90.0%, and melting point: 138° to 140° C.).
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