| 摘要 |
The novel compounds of the formula I <IMAGE> (I) in which A is a group of the formula IIa or IIb, <IMAGE> (IIa) <IMAGE> (IIb) Y is oxygen, methylene, ethylidene or a >C=C(CH3)2 group, Z is nitrogen, <IMAGE> R1 and R2 are, for example C1-C5alkyl, R3 and R4 are, for example, hydrogen or methyl, and R5, R6, R7, R8, R9, R10, R11, R12, R13 and R14 are, for example, hydrogen, are suitable for stabilizing organic material against oxidative, thermal or light-induced degradation.
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