4,4-(O-phenylenedioxy)-2,2,6,6-tetramethyl piperidine

Abstract

4-Piperidone ketal derivatives of the formulae ##SPC1## And ##SPC2## Wherein R.sub.1 represents an alkyl group of 1 to 8 carbon atoms and R.sub.2 represents an alkylene group of 2 or 3 carbon atoms or o-phenylene group and they are prepared by reacting triacetonamine with a monohydric alcohol of the formula R.sub.1 --OH (III) wherein R.sub.1 is as defined above or a dihydric alcohol or phenol of the formula R.sub.2 --(OH).sub.2 (IV) wherein R.sub.2 is as defined above in the presence of an acid catalyst. They are useful as statilizers against deterioration of synthetic polymers.

Dependencies are inferred from the claim text.