abstract |
The present invention relates to novel compounds of formula (III), their preparation and mixtures of these compounds with other compounds. Compounds of formula III are suitable for stabilizing organic materials from the effects of light and heat.n n n Formula IIIn n n n n n n n In the above formula,n n n n, m, R 1 , R 2 , R 3 and R 4 are as defined in the specification. |