| 摘要 |
Substituted 1-hydroxy-2,6-diaryl-4-acyloxypiperidines or 1-hydroxy-2,6-diaryl-4-acylaminopiperidines of formula I <CHEM> wherein n is 1-4, Ar1 and Ar2 are independently aryl or substituted aryl, R1, R2, R3 and R4 are independently hydrogen, alkyl, substituted alkyl, alkenyl, aryl or substituted aryl, X is -O- or -NE-, E is hydrogen, alkyl or cycloalkyl and T is an n-valent aliphatic or aromatic hydrocarbon radical, are effective in stabilizing organic materials against the deleterious effects of oxygen, heat and actinic radiation.
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