Chlorine gas reacts with 2-(2-acetoxy-5-methylphenyl)benzotriazole in the presence of anhydrous sodium carbonate to form novel addition derivatives of the benzotriazol-2-yl nucleus, namely configurational isomers of 2-(2-acetoxy-5-methylphenyl)-4,5,6,7-tetrachloro-4,5,6,7-tetrahydrobenzotriazole and 2-(2-acetoxy-5-chloromethylphenyl)-4,5,6,7-tetrachloro-4,5,6,7-tetrahydrobenzotriazole.
T. Norris, A. Payne and D. T. Southby, J. Chem. Soc., Chem. Commun., 1978, 932 DOI: 10.1039/C39780000932
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