| 摘要 |
<p>New compounds of formula (I): <CHEM> [in which: R<1> is hydrogen, alkyl, alkoxyalkyl, carboxylic acyl or phenylalkyl, or an optionally substituted tetramethylpiperidyl group; R<2> is hydrogen, alkyl, carboxylic acyl or phenylalkyl group; R<3> is alkylene optionally interrupted by at least one oxygen atom; X is oxygen or -NR<5>- (in which R<5> is hydrogen or alkyl); Y is -OCO-, -COO-, -CONH- or -OCONH-; n is 2 to 4; and, when n is 2, Z is alkylene optionally interrupted by at least one oxygen, sulfur or aryl, cycloalkyl or heterocyclic group, or, when n is 3, Z is alkanetriyl in which a carbon is optionally replaced by nitrogen or, when n is 4, Z is alkanetetrayl optionally interrupted by at least one oxygen atom] and acid addition salts thereof are valuable polymer stabilizers. The compounds may be prepared by reacting an active compound corresponding to the portion of the compound of formula (I) shown above in brackets.</p> |
