DERIVATI DELL'ACIDO 5-ALCOSSI-2,4,6-TRIIODO- O -TRIBROMO-ISOFTALICO, METODO PER LA LORO PREPARAZIONE E RELATIVI MEZZI DI CONTRASTO RADIOLOGICI

1. Claims (for the Contracting States : BE, CH, DE, FR, GB, IT, LI, LU, NL, SE) 5-Alkoxy-2,4,6-triiodo- or tribromo-isophthalic diamides of the general formula (I) see diagramm : EP0185130,P26,F3 in which X denotes iodine or bromine R1 and R3 may be identical or different, namely denote hydrogen, lower alkyl or hydroxyalkyl, R2 and R4 may be identical or different, namely denote hydroxyalkyl having 1 to 5 HO functions and 2 to 6 C atoms, R5 denotes hydroxyalkyl having 1 to 5 HO functions and 2 to 6 C atoms, denotes (poly) alkoxyalkyl having 1 to 10 oxa functions and 3 to 33 C atoms, denotes hydroxy(poly) alkyl having 1 to 10 oxa functions and 4 to 33 C atoms denotes aminocarbonylalkyl of the formula see diagramm : EP0185130,P27,F1 in which R6 denotes H, alkyl or hydroxyalkyl, R7 denotes hydroxyalkyl having 1 to 5 HO functions and 2 to 6 C atoms, and alkylene denotes straight-chain or branched divalent alkylene having 1 to 5 C atoms, and R5 denotes alkyl having 10 to 20 C atoms, or A-alkylene'-, in which alkylene' denotes divalent alkylene having 2 to 12 C atoms and 0 to 5 oxa, thia, HO or amide functions, and A denotes a 3,5-bis-(aminocarbonyl)-2,4,6-trihalo-phenoxy radical of the formula I, which is located within the dashed line. 1. Claims (for the Contracting State AT) Process for the preparation of 5-alkoxy-2,4,6-triiodo- or tribromo-isophthalic diamides of the general formula (I). see diagramm : EP0185130,P28,F1 in which X denotes iodine or bromine R1 and R3 may be identical or different, namely denote hydrogen, lower alkyl or hydroxyalkyl, R2 and R4 may be identical or different, namely denote hydroxyalkyl having 1 to 5 HO functions and 2 to 6 C atoms, R5 denotes hydroxyalkyl having 1 to 5 HO functions and 2 to 6 C atoms, denotes (poly) alkoxyalkyl having 1 to 10 oxa functions and 3 to 33 C atoms, denotes hydroxy(poly) alkyl having 1 to 10 oxa functions and 4 to 33 C atoms denotes aminocarbonylalkyl of the formula see diagramm : EP0185130,P28,F2 in which R6 denotes H, alkyl or hydroxyalkyl, R7 denotes hydroxyalkyl having 1 to 5 HO functions and 2 to 6 C atoms, and alkylene denotes straight-chain or branched divalent alkylene having 1 to 5 C atoms, and R5 denotes alkyl having 10 to 20 C atoms, or A-alkylene'-, in which alkylene' denotes divalent alkylene having 2 to 12 C atoms and 0 to 5 oxa, thia, HO or amide functions, and A denotes a 3,5-bis-(aminocarbonyl)-2,4,6-trihalo-phenoxy radical of the formula I, which is located within the dashed line, cha