dicarboxylic - bis - (3.5 - - - - dicarbamoyl 2,4,6 tri joodaniliden) method for the preparation of these compounds based on roentgencontrastmiddelen,and to tracarbonzuurtetrachloriden as intermediates for the preparation of these compounds and the tetrachloriden.

摘要

Dicarboxylic acid bis(3,5-dicarbamoyl-2,4,6-triiodoanilides) of the formula IMAGE wherein R1 is lower straight-chain or branched-chain mono- or polyhydroxyalkyl; R2 is hydrogen, lower alkyl or R1; R3 is hydrogen or lower alkyl; and X is a direct bond or straight-chain or branched-chain alkylene interrupted by one or more oxygen or substituted by hydroxy or lower alkyl, are useful in x-ray contrast media.