Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1976-06-07
1978-02-21
Hoke, V. P.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
260 458N, 260 4585B, 260 4585S, 260 459NC, C08K 520, C08K 534, C08K 512
Patent
active
040751619
ABSTRACT:
Ester and amides having the formula ##STR1## wherein R, R.sup.1 and R.sup.2 are independently lower alkyl or cycloalkyl groups, R.sup.3 is hydrogen, alkyl, cycloalkyl, alkylene, phenyl, phenyl substituted by alkyl groups, alkylthioethyl, thiobis-alkylene, alkyleneoxyalkylene, polyoxyalkylene or a polyvalent cyclic or acyclic hydrocarbon radical, R.sup.4 is hydrogen, lower alkyl, cycloalkyl, R.sup.5 is hydrogen, alkyl, phenyl, phenyl substituted by alkyl groups, alkylene, a polyvalent cyclic or acyclic hydrocarbon radical or alkyleneoxy-alkylene, A is lower alkylene, m is 1 to 4 and n is 1 to 6.
The esters are prepared by usual esterification procedures from a suitable alcohol and an acid of the formula III ##STR2## or an acid halide or acid anhydride thereof. The higher alkyl esters can also be prepared from the lower alkyl ester, especially the methyl ester, by transesterification with a higher alkanol or polyol.
The amides are prepared by usual amidation procedures by reacting a carboxylic acid of formula III, an acid chloride, anhydride or a lower alkyl ester thereof with the appropriate amine.
The nitriles corresponding to acids of formula III are prepared as well as some malonate esters derived having the formula V. ##STR3## The compounds are useful as stabilizers of organic materials, especially polyolefins, which deteriorate upon exposure to light and heat.
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Dexter Martin
Spivack John D.
Ciba-Geigy Corporation
Hall Luther A. R.
Hoke V. P.
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