| 摘要 |
Compounds of formula I <IMAGE> (1) wherein R1 is hydrogen, C1-C8alkyl, C5-C8cycloalkyl or C7-C9phenylalkyl, A1 and A4 are phenyl, <IMAGE> or phenyl which is substituted by 1 to 3 radicals R3, which radicals R3 are each independently of one another selected from the group consisting of C1-C4alkyl, C1-C18alkoxy, C3-C4alkenyloxy, C7-C9phenylalkoxy, C5-C8cycloalkoxy, C1-C18alkanoyloxy, C3-C18alkenoyloxy, benzoyloxy, phenoxy and hydroxy, m is 1 or 2, A2 and A3, together with the linking carbon atom, form a C5-C7cycloalkylidene ring which is unsubstituted or substituted by 1 to 3 C1-C4alkyl groups, are very suitable for stabilising organic materials against thermal, oxidative or light-induced degradation. |
