| abstract |
A compound of the formula (I) wherein G 1 , G 2 , G 3 and G 4 are independently of one another C 1 -C 18 alkyl or C 5 -C 12 cycloalkyl or the radicals G 1 and G 2 and the radicals G 3 and G 4 form independently of one another, together with the carbon atom they are attached to, C 5 -C 12 cycloalkyl; R is hydrogen, C 1 -C 18 alkyl, oxyl, —OH, —CH 2 CN, C 3 -C 6 alkenyl, C 3 -C 8 alkynyl, C 7 -C 12 phenylalkyl unsubstituted or substituted on the phenyl radical by C 1 -C 4 alkyl and/or C 1 -C 4 alkoxy; C 1 -C 8 acyl, C 1 -C 18 alkoxy, C 1 -C 18 hydroxyalkoxy, C 2 -C 18 alkenyloxy, C 5 -C 12 cycloalkoxy, C 7 -C 12 phenylalkoxy unsubstituted or substituted on the phenyl radical by C 1 -C 4 alkyl and/or C 1 -C 4 alkoxy; C 1 -C 18 alkanoyloxy, (C 1 -C 18 alkoxy)carbonyl, glycidyl or a group —CH 2 CH(OH)(G) with G being hydrogen, methyl or phenyl; n is 1, 2, 3 or 4; and X is an organic radical of a valency equal to n; and when n is 2, 3 or 4, each of the radicals G 1 , G 2 , G 3 , G 4 and R can have the same or a different meaning in the units of the formula (II), is useful for stabilizing an organic material against degradation induced by light, heat or oxidation |