Abstract: Compounds of the formula I ##STR1## in which R.sub.1 and R.sub.2, independently, denote alkyl with 1 to 6 carbon atoms, cycloalkyl with 5 to 8 carbon atoms, allyl, methallyl, aralkyl with 5 to 9 carbon atoms, phenyl, 1- or 2-naphthyl, or alkaryl with 7 to 9 carbon atoms, R.sub.2 moreover also denotes hydrogen, R.sub.3 denotes hydrogen, alkyl with 1 to 6 carbon atoms, unsubstituted phenyl or phenyl substituted by one or two chlorine atoms and/or one or two methyl groups, B denotes a hetero atom, the group --OC(O)--, --OC(O)--CH.sub.2 CH.sub.2 -- or a direct bond, m is an integer from 0 to 6, and n is an integer from 1 to 6, are prepared by reaction of a thioglycerol derivative with a carboxylic acid containing the hindered phenol moiety in the presence of an acid and are used as antioxidants and thermal stabilizers for lubricating oils, plastics, resins and other organic substrates.

Abstract: Compounds of the formula I ##STR1## in which R.sub.1 and R.sub.2, independently, denote alkyl with 1 to 6 carbon atoms, cycloalkyl with 5 to 8 carbon atoms, allyl, methallyl, aralkyl with 5 to 9 carbon atoms, phenyl, 1- or 2-naphthyl, or alkaryl with 7 to 9 carbon atoms, R.sub.2 moreover also denotes hydrogen, R.sub.3 denotes hydrogen, alkyl with 1 to 6 carbon atoms, unsubstituted phenyl or phenyl substituted by one or two chlorine atoms and/or one or two methyl groups, B denotes a hetero atom, the group --OC(O)--, --OC(O)--CH.sub.2 CH.sub.2 -- or a direct bond, m is an integer from 0 to 6, and n is an integer from 1 to 6, are prepared by reaction of a thioglycerol derivative with a carboxylic acid containing the hindered phenol moiety in the presence of an acid and are used as antioxidants and thermal stabilizers for lubricating oils, plastics, resins and other organic substrates.