Patent ID: 7906684

Claim:
A method of providing antioxidant properties to a compound or composition, comprising adding a compound of formula I to said compound or composition where R stands for Ar each stand, independently of one another, for an unsubstituted or mono- or polysubstituted aromatic ring or condensed ring system having 6 to 18 C atoms, at least one ring of which has aromatic character, in which one or two CH groups per ring may be replaced by C═O, N, O or S and in a condensed ring system one or two CH 2 groups may be replaced by C═O or C═CH 2 , Z 1 stands for CR 7 R 8 or a single bond, X 1 to X 4 are each, independently of one another, C—R 1 , O, N or S, where 2 adjacent radicals from X 1 to X 4 may together also stand for an unsubstituted or mono- or polysubstituted ring or condensed ring system having 6 to 18 C atoms, at least one ring of which optionally has aromatic character, in which one or two CH groups per ring may be replaced by C═O, N, O or S and in a condensed ring system one or two CH 2 groups may be replaced by C═O or C═CH 2 , R 1 is selected from the group consisting of H, straight-chain and branched C 1 - to C 20 -alkoxy groups, where the alkyl chains are each optionally interrupted by oxygen or nitrogen, straight-chain and branched C 1 - to C 20 -alkyl groups, where the alkyl chains are each optionally interrupted by oxygen or nitrogen, straight-chain and branched C 3 - to C 20 -alkenyl groups, straight-chain and branched C 1 - to C 20 -hydroxyalkyl groups, where the hydroxyl group may be bonded to a primary or secondary carbon atom of the chain and the alkyl chains are each optionally interrupted by oxygen or nitrogen, straight-chain and branched C 1 - to C 20 -hydroxyalkoxy groups, where the hydroxyl group(s) may be bonded to primary or secondary carbon atoms of the chain and the alkyl chain is optionally interrupted by oxygen, straight-chain and branched C 1 - to C 20 -alkylamino groups, and straight-chain and branched C 1 - to C 20 -dialkylamino groups, or R 1 stands for a carboxylic acid, phosphoric acid, sulfonic acid, or sulfuric acid group, which is optionally esterified resulting in a straight-chain or branched C 1 - to C 20 -alkyl or straight-chain or branched C 3 - to C 20 -alkenyl ester group of said carboxylic acid, phosphoric acid, sulfonic acid, or sulfuric acid group, R 7 and R 8 are each, independently of one another, H, OH, straight-chain or branched C 1 - to C 20 -alkoxy group, straight-chain or branched C 1 - to C 20 -alkyl group, straight-chain or branched C 3 - to C 20 -alkenyl group, straight-chain or branched C 1 - to C 20 -hydroxyalkyl group, where the hydroxyl group may be bonded to a primary or secondary carbon atom of the chain and furthermore the alkyl chain may be interrupted by oxygen, straight-chain or branched C 1 - to C 20 -hydroxyalkoxy groups, where the hydroxyl group(s) may be bonded to a primary or secondary carbon atom of the chain and the alkyl chain may also be interrupted by oxygen, or a salt thereof.