| abstract |
Compounds of the formula <IMAGE> wherein R1 and R2 are independently lower alkyl or hydrogen, provided that only one of R1 and R2 is hydrogen, R3 is -(A)q-COOR4 or CN where A is alkylene of 1 to 6 carbon atoms, R4 is alkyl of 1 to 24 carbon atoms, phenyl or alkyl substituted phenyl, X is S or 0, R6 is phenylene, alkyl substituted phenylene or alkylene, and q is 0 or 1 are suitable for stabilizing organic material against thermal, oxidative and ultraviolet light degradation. |