Novel pyridinedione derivatives are used as light stabilizers for organic materials, e.g. plastics, lacquers, photographic products or pharmaceuticals

摘要

New pyridinedione derivatives comprise up to four pyridinedione groups, each with an aminomethylene substituent, and a cyano, acyl, carboxy or carbamoyl substituent. Pyridinedione derivatives of formula (I) and their tautomers are new. R 1>H or optionally substituted and/or optionally heteroatom-containing alkyl, alkenyl or alkynyl, or optionally substituted cycloalkyl, cycloalkenyl, heterocycloalkyl, aryl or heteroaryl; R 2>as R 1>, or NR 4>R 5>; R 4>, R 5>as R 1> or COR 6>; A : CN, COR 7>, COOR 7> or CONR 7>R 8>; R 6>, R 7>, R 8>as R 1>; n : 1-4; R 3>as R 1> when n is 1; or an n-valent optionally heteroatom-containing aliphatic or cycloaliphatic group when n is 2-4. [Image].