Substituted malonic acid derivatives and their use as stabilizers

Claim 1

A member selected from the group consisting of a compound of the formula (I) ##STR60## and an acid addition salt thereof, wherein n is 1 or 2, R a represents alkyl having 1-6 carbon atoms, R b represents alkyl having 1-6 carbon atoms, R c represents alkyl having 1-9 carbon atoms, phenyl, benzyl or phenylethyl, R d represents alkyl having 1-6 carbon atoms, or R c and R d together represent tetra- or pentamethylene, R e represents hydrogen, alkyl having 1-5 carbon atoms, alkenyl having 3-4 carbon atoms, alkynyl having 3-4 carbon atoms or aralkyl having 7-8 carbon atoms, R f represents hydrogen, alkyl having 1-5 carbon atoms, alkenyl having 3-4 carbon atoms, alkynyl having 3-4 carbon atoms, or aralkyl having 7-8 carbon atoms, with R e and R f being mutually exchangeable, and X represents oxygen or --NR--, R represents hydrogen, alkyl having 1-18 carbon atoms, alkenyl having 3-4 carbon atoms, alkynyl having 3-4 carbon atoms, cycloalkyl having 5-12 carbon atoms, aryl having 6-10 carbon atoms, or aralkyl having 7-9 carbon atoms, R 1 represents hydrogen, --O.sup.., --OH, alkyl having 1-12 carbon atoms, alkenyl having 3 or 4 carbon atoms, propargyl, benzyl or a group of the formula --CH 2 --CH(OR 5 )--R 4 wherein R 4 represents hydrogen, methyl or phenyl, and R 5 represents hydrogen or a group A--CO--, or R 1 represents a group A--CO--, and in both cases A represents alkyl having 1-12 carbon atoms, alkenyl having 2 or 3 carbon atoms, cyclohexyl, phenyl, benzyl, a phenyl or phenylethyl group substituted by 2 alkyl groups each having 1-4 carbon atoms and a hydroxyl group, alkylamino having 1-12 carbon atoms, dialkylamino having 2-16 carbon atoms, anilino, alkoxy having 1-12 carbon atoms, benzyloxy or phenoxy, R 2 represents a hydroxybenzyl group of the formula II ##STR61## wherein R 6 and R 7 each independently represent an alkyl group having 1-9 carbon atoms, aralkyl having 7-9 carbon atoms or cycloalkyl having 5-8 carbon atoms, and R 8 represents hydrogen or methyl, and R 3 represents, in the case where n is 1, alkyl having 1-20 carbon atoms, or alkyl having 1-10 carbon atoms, which is substituted by at least one of the groups --OR 9 , --SR 10 , --CO-R 11 , --CN, --C(O)--YR 12 , --O--C(O)R 13 or --P(O)(OR 14 ) 2 , wherein R 9 denotes phenyl or alkylphenyl having 7-10 carbon atoms, benzyl or cyclohexyl, R 10 represents phenyl or alkylphenyl having 7-10 carbon atoms, R 11 denotes alkyl having 1-12 carbon atoms, Y denotes oxygen or --NR--, and R has the above-given meaning, R 12 denotes alkyl having 1-18 carbon atoms, cycloalkyl having 5-12 carbon atoms, or a group of the formula III ##STR62## wherein R 17 has one of the meanings given for R 1 R 13 denotes alkyl having 1-17 carbon atoms, cycloalkyl having 5-12 carbon atoms, or phenyl or phenylalkyl having 7-9 carbon atoms, wherein the phenyl radical is unsubstituted or substituted by at least one of the groups alkyl having 1-4 carbon atoms and hydroxyl, and R 14 denotes alkyl having 1-8 carbon atoms, allyl or phenyl, and X has the above-defined meaning, and R 3 further represents an alkyl group having 2-22 carbon atoms, which is interrupted by --O--, --S--, --SO-- or --SO 2 --, alkenyl having 3-18 carbon atoms, alkynyl having 3-8 carbon atoms, cycloalkyl having 5-12 carbon atoms, alkyl-cycloalkyl having 6-18 carbon atoms, cycloalkyl-alkyl having 6-14 carbon atoms, aralkyl or alkyl-aralkyl having 7-19 carbon atoms, phenyl, or a group --OR 15 , wherein R 15 is alkyl having 1-18 carbon atoms, alkenyl having 3-4 carbon atoms, alkynyl having 3-4 carbon atoms, cycloalkyl having 5-12 carbon atoms or aralkyl having 7-9 carbon atoms, or R 3 represents a group --O--C(O)R 16 or --NH--C(O)R 16 , wherein R 16 is alkyl having 1-12 carbon atoms, alkenyl having 2 or 3 carbon atoms, cyclohexyl, phenyl, benzyl, a phenyl or phenylethyl group substituted by 2 alkyl groups each having 1- 4 carbon atoms and a hydroxyl group, or R 3 is a group of the formula III or of the formula IV ##STR63## wherein R 18 represents alkyl having 1-20 carbon atoms, allyl, benzyl, phenyl, cyclohexyl, alkoxyalkyl- having 3-8 carbon atoms, or a group --O--C(O)R 16 or --NH--C(O)R 16 as defined above, or has one of the meanings given for R 2 , and R 19 and R 20 each independently represent alkyl having 1-6 carbon atoms, or a radical of the formula III, and, in addition, R 3 represents, in the case where n is 2, a direct bond, alkylene having 1-20 carbon atoms, alkylene having 2-20 carbon atoms, which is interrupted by one or two of the members --O--, --S--, --SO--, --SO 2 -- or --CO--O--, arylene-bis-alkylene having 8-14 carbon atoms, alkenylene having 4-8 carbon atoms, or alkynylene having 4-8 carbon atoms.