| abstract |
Compounds of the formula (I) n n n wherein n p is zero or 1; q and r, independently of each other, are an integer from 1 to 6; and n s is a number ranging from 1 to 8; n X is —O— or, when p is 1, X is also a group n n n R w , R x , R y and R z are, independently of each other, C 1 -C 18 alkyl, C 5 -C 12 cycloalkyl or C 1 -C 5 hydroxyalkyl, especially methyl; n R 1 is hydrogen; C 1 -C 18 alkyl; oxyl; OH; CH 2 CN; C 1 -C 18 alkoxy; C 5 -C 12 cycloalkoxy; C 3 -C 8 alkenyl; C 3 -C 8 alkynyl; C 7 -C 12 phenylalkyl; C 7 -C 15 phenylalkyl, which is substituted on the phenyl ring by 1, 2 or 3 radicals selected from C 1 -C 4 alkyl and C 1 -C 4 alkoxy; C 7 -C 15 phenylalkoxy; C 7 -C 15 phenylalkoxy, which is substituted on the phenyl ring by 1, 2 or 3 radicals selected from C 1 -C 4 alkyl and C 1 -C 4 alkoxy; or R 1 is C 1 -C 8 alkanoyl; C 3 -C 5 alkenoyl; C 1 -C 18 alkanoyloxy; glycidyl; or a group —CH 2 CH(OH)—G, in which G is hydrogen, methyl or phenyl; n R 2 is hydrogen, C 1 -C 8 alkyl, C 5 -C 12 cycloalkyl or C 1 -C 4 hydroxyalkyl; n R 3 , R 4 , R 5 independently of each other are hydrogen, C 1 -C 8 alkyl or C 5 -C 12 cycloalkyl; and n W and other residues are as described in claim 1, are effective stabilizers for organic materials, for example thermoplastic organic polymers, coating compositions or photographic materials. |