Bis-piperazides of trisubstituted hydroxyphenylalkanoic acids

Details Bis-piperazides of trisubstituted hydroxyphenylalkanoic acids Bis-piperazides of trisubstituted hydroxyphenylalkanoic acids

1977-04-22

1978-07-18

Tovar, Jose

Organic compounds -- part of the class 532-570 series

Organic compounds

Nitrogen attached directly or indirectly to the purine ring...

260 458NE, 260 4585B, 260 459NC, 260559R, 544357, 544391, C07D29518

Patent

active

041015509

ABSTRACT:
The compounds are esters and amides of trialkylhydroxyphenylalkanoic acid 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 with alkyl groups, alkylene, polyoxyalkylene or polyvalent cyclic or acyclic hydrocarbon radical, A is lower alkylene, m is 1 to 4 and n is 1 to 6.
The ester compounds of this invention are prepared via usual esterification procedures from a suitable alcohol and an acid of the formula I ##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 of the above represented compounds, by transesterification with a higher alkanol.
The amide compounds of this invention are prepared by usual amidation procedures by reacting a carboxylic acid of formula I or an acid chloride or anhydride or a lower alkyl ester thereof with the appropriate amine.
The compounds are useful as stabilizers for organic materials, especially polyolefins, which deteriorate upon exposure to light and heat.

REFERENCES:
patent: 3691131 (1972-09-01), Peter Kelmchuk
patent: 3763166 (1973-10-01), Dexter et al.

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