Process for the preparation of a dicarboxylic acid dichloride

Details Process for the preparation of a dicarboxylic acid dichloride Process for the preparation of a dicarboxylic acid dichloride

C - Chemistry, Metallurgy

07

C

C07C 227/18 (2006.01) C07C 313/06 (2006.01) C07C 381/10 (2006.01)

Patent

CA 2195636

The present invention refers to a process for the preparation of 5-amino-2,4,6- triiodo-1,3-benzenedicarboxylic acid dichloride, comprising the reaction in heterogeneous phase between 5-amino-2,4,6-triiodo- 1,3-benzenedicarboxylic acid and thionyl chloride, in a solvent selected from the group consisting of: (C7-C16) linear or branched hydrocarbons, (C7-C8) aromatic hydrocarbons, 1,1,1-trichloroethane, n--butylacetate, diglyme (diethyleneglycoldimethylether), and in the presence of a catalytic amount of a tertiary amine.

La présente invention se rapporte à un procédé de préparation de dichlorure d'acide 5-amino-2,4,6-triiodo-1,3-benzènedicarboxylique, comprenant la réaction en phase hétérogène entre l'acide 5-amino-2,4,6-triiodo-1,3-benzènedicarboxylique et du chlorure de thionyle, dans un solvant sélectionné dans le groupe constitué par les hydrocarbures linéaires ou ramifiés (C7-C16), les hydrocarbures aromatiques (C7-C8), 1,1,1-trichloroéthane, n-butylacétate et diglyme (diéthylènglycoldiméthyléther), et en présence d'une quantité catalytique d'une amine tertiaire.

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