| abstract |
Compounds of formula I. wherein R and R 2 are, for example, C 1 -C 12 alkyl, C 5 -C 6 cycloalkyl, phenyl or C 7 -C 9 aralkyl and R 3 and R 4 are, for example, hydrogen, C 1 -C 20 alkyl, C 5 -C 6 are cycloalkyl or phenyl, are suitable as stabilizers for organic material. |