2-Nitro-2'-hydroxy-3',5'-bis(tert-amyl)azobenzene → 2,4-Di-tert-butyl-6-(5-chloro-2H-benzotriazol-2-yl)phenol

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When in Example 1, the 2'-hydroxy-3',5'-di-tert-amyl-2-nitroazobenzene was replaced by an equivalent amount of 2'-hydroxy-3',5'-di-tert-butyl-5-chloro-2-nitroazobenzene, the product 5-chloro-2-(2-hydroxy-3,5-di-tert-butylphenyl)-2H-benzotriazole was obtained after a reaction time of 5 hours in a yield of 80.4% of theory as an isolated product of melting point 151°-154° C. An additional 4.5% yield was present in the mother liquor for an overall yield of 84.9% of theory.

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