Method of making hydroxyarylbenzotriazoles and their n-oxides

Details Method of making hydroxyarylbenzotriazoles and their n-oxides Method of making hydroxyarylbenzotriazoles and their n-oxides

C - Chemistry, Metallurgy

07

D

400/9443, 260/31

C07D 249/20 (2006.01) C08K 5/34 (2006.01)

Patent

CA 1155856

ABSTRACT OF THE DISCLOSURE Cataiytic hydrogenation of o-nitrophenylazohydroxy_ aryls in an alkaline medium yields hydroxyarylbenzotri- azoles; under mild conditions an N-oxido is formed. E.g., 6-tert-butyl-2-(5'-chloro-2'-nitrophenylazo)-p-cresol is hydrogenated to 5-chloro-2-(3'-tert-butyl-2'-hydroxy-5'- methylphenyl)benzotriazole, using pletinum sulfide catalyst in the presence of sodium hydroxide: Image in this case A in the starting chemical is 5-chloro, n is 1, Ar is a phenyl nucleus, m is 2, one B is 6-tert- butyl and the other B is 4-methyl; in the product x is zero. Chemicals useful for vrious purposes, including the stabilization of polymeric materials (e.g., poly- propylene, polyvinyl chloride) against light, may be made by the process.

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