FIELD: chemistry.
SUBSTANCE: acid of general formula 
, where R can be a straight or branched alkyl, unsubstituted or substituted phenyl, where substitutes of the phenyl group may be 1-5 lower alkyl groups, 1-5 lower alkoxy groups, 1-5 halogen atoms, 1-5 dialkylamino groups, Y is a single bond or a methylene group, is obtained by mixing secondary phosphine oxides of formula R2P(O)H with unsaturated 1,4-dicarboxylic acids and then heating the mixture in a melt at normal pressure and temperature of 80-120°C until completion of the reaction.
EFFECT: novel method of producing valuable intermediate products of organic synthesis.
2 cl, 12 ex
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