| abstract |
Compounds of the general formula I <IMAGE> (I) +TR <IMAGE> in which R1 and R5 independently of one another denote hydrogen or lower alkyl, one of R2 and R3 denotes hydroxyl and the other denotes alkyl, cycloalkyl or aralkyl, R4 denotes hydrogen or, if R3 denotes hydroxyl, additionally also denotes alkyl, cycloalkyl or aralkyl, X denotes the direct bond, or a group <IMAGE> wherein R8 is hydrogen, alkyl, aralkyl or phenyl and R9 is hydrogen, alkyl, aralkyl, phenyl or the group <IMAGE> wherein R1-R5 have the above meaning, of R9 conjointly with R8 is alkylene, Y denotes oxygen or sulfur, n denotes 1, 2, 3 or 4, R6 denotes tha acid radical of an n-valent organic oxygen acid or, if n is equal to 1, additionally also denotes hydroxyl or, if n is equal to 2, additionally also denotes -O-, and R7 denotes a lower alkyl group having 1 -3 carbon atoms, or, if n is equal to 1, additionally also denotes, conjointly with R6, a group Ia <IMAGE> (Ia) WHEREIN R1-R5, X and Y have the above meaning, or if n is equal to 1 and Y denotes oxygen, additionally also denotes, conjointly with R6, a group Ib <IMAGE> (Ib) +tr <IMAGE> wherein R1- R5 and X have the above meaning, and R10 is hydroxyl or the acid radical of a monovalent organic oxygen acid, for stabilising organic material. |