Hydroxybenzylmalonic acid derivatives

Details Hydroxybenzylmalonic acid derivatives Hydroxybenzylmalonic acid derivatives

1976-12-06

1979-04-10

Trousof, Natalie

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

546 16, 546188, 546189, C07D21146, C07D21158

Patent

active

041487834

ABSTRACT:
Hydroxybenzylmalonic acid derivatives of 1-acylpiperidin-4-ols or 1-acyl-4-aminopiperidines respectively having the formula ##STR1## WHEREIN R.sub.a, R.sub.b, R.sub.c, R.sub.d are hydrocarbon residues, R.sub.e is H or lower alkyl, R.sub.1 is a hydroxybenzyl residue, R.sub.2 is H or R.sub.1, X is --O-- or --NH-- and Y is hydrogen, a hydrocarbon, amino, alkoxy or phenoxy residue are excellent stabilizers for plastics material, especially for polyolefins. They act against heat aging as well as against light aging. The compounds may be prepared by acylation of the corresponding NH compounds or by hydroxybenzylation of the corresponding malonic acid derivatives.

REFERENCES:
patent: 3640928 (1972-02-01), Murayama et al.
patent: 3993655 (1976-11-01), Rasberger et al.
patent: 4021432 (1975-05-01), Holt et al.
patent: 4069196 (1978-01-01), Ramey et al.
patent: 4075165 (1978-02-01), Soma et al.

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