Pyrrolidine dicarboxylic acids and esters and stabilized compositions
申请人:Ciba-Geigy Corporation
公开号:US04093586A1
公开(公告)日:1978-06-06
Compounds having the formula ##STR1## wherein X is alkyl, hydrogen, hydroxyl, oxygen radical, alkenyl, CH.sub.2 CH.sub.2 OCH.sub.3 or CH.sub.2 C.tbd.CH; R.sup.1 is alkyl or phenethyl; and R.sup.2 is alkyl, Are good light stabilizers. These compounds are prepared for example, from acetonlyacetone, an appropriate amine hydrochloride and sodium cyanide to give N-substituted 2,5-dimethyl-2,5-dicyanopyrrolidines which are coverted by standard techniques to the corresponding dicarboxylic acid. These esters are prepared by alkylation of appropriate alkali metal salts.