Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1976-06-07
1978-05-16
Cockeram, H.S.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
260155, 260156, 260192, 260197, 260206, 260288CE, 260296B, 260308B, C08K 534, C07D24920, C07D40104
Patent
active
040898393
ABSTRACT:
Catalytic hydrogenation of o-nitrophenylazohydroxyaryls in an alkaline medium yields hydroxyarylbenzotriazoles; under mild conditions an N-oxide 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 platinum sulfide catalyst in the presence of sodium hydroxide: ##STR1## 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-tertbutyl and the other B is 4-methyl; in the product x is zero. Chemicals useful for various purposes, including the stabilization of polymeric materials (e.g., polypropylene, polyvinyl chloride) against light, may be made by the process.
REFERENCES:
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patent: 3230194 (1966-01-01), Boyle
patent: 3244667 (1966-04-01), Burgess et al.
patent: 3271339 (1966-09-01), Cappuccio et al.
patent: 3405089 (1968-10-01), Mauz et al.
patent: 3481897 (1969-12-01), Marinaccio et al.
patent: 3600355 (1971-08-01), Cyba
Cockeram H.S.
Long James J.
Uniroyal Inc.
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