Ester and amides having the formula ##SPC1##Wherein R, R.sup.1 and R.sup.2 are independently lower alkyl or cycloalkyl groups, R.sup.3 is hydrogen, alkyl, cycloalkyl, alkylene, phenyl, phenyl substituted by alkyl groups, alkylthioethyl, thiobis-alkylene, alkyleneoxyalkylene, polyoxyalkylene or a polyvalent cyclic or acyclic hydrocarbon radical, R.sup.4 is hydrogen, lower alkyl, cycloalkyl, R.sup.5 is hydrogen, alkyl, phenyl, phenyl substituted by alkyl groups, alkylene, a polyvalent cyclic or acyclic hydrocarbon radical or alkyleneoxyalkylene, A is lower alkylene, m is 1 to 4 and n is 1 to 6.The esters are prepared by usual esterification procedures from a suitable alcohol and an acid of the formula III ##SPC2##or an acid halide or acid anhydride thereof. The higher alkyl esters can also be prepared from the lower alkyl ester, especially the methyl ester, by transesterification with a higher alkanol or polyol.The amides are prepared by usual amidation procedures by reacting a carboxylic acid of formula III, an acid chloride, anhydride or a lower alkyl ester thereof with the appropriate amine.The nitriles corresponding to acids of formula III are prepared as well as some malonate esters derived having the formula V. ##SPC3##The compounds are useful as stabilizers or organic materials, especially polyolefins, which deteriorate upon exposure to light and heat.