abstract |
Compounds of the formula (I) <IMAGE> (I) in which n is zero or 1, X denotes a group of formula (II), <IMAGE> (II) R1 and R5 are e.g. hydrogen, R2, R3 and R4, which may be identical or different, are C2-C12alkylene, R6 is e.g. hydrogen or C1-C18alkyl and R7 is e.g. hydrogen or C1-C8alkyl, are useful as stabilizers for organic materials against degradation induced by light, heat or oxidation. |