A new coloring agent (III) was synthesized from t-butyl hypochlorite (I) and 1 (2-nitro-4-methyl-benzene) -azo-1-naphthol (II).
In an 1 liter flask were added II 31. 6 g. and chloroform 632 ml., and I 22. 9 ml. was then added at room temperature during the course of an hour while the solution was kept stirred with a magnetic stirrer. The resulting solution was kept stirred for another one hour, stored overnight in a dark place, and filtered. The filtrate was condensed to one-fourth the original volume in vacuum. Red crystals were formed together with black precipitates, which were filtered off, mixed with active carbon 0.8 g., dissolved in 300 ml. of chloroform. The filtrate was condensed to one-fifth the original volume. Pillar-shaped red crystals, m. p. 248~9°C, were precipitated, which was identified as C
11H
15N
3O
3 or III. The yield was 16 g. (67%).
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