摘要:
Disclosed is a new process for the crystallization of (S)-N,N'-bis[2-hydroxy-1-(hydroxymethyl)ethyl]-5-[(2-hydroxy-1-oxopropyl)amino]-2,4,6-triiodo-1,3-benzendicarboxamide (I), using a linear or branched (C5-C6) alcohol or their mixtures.
摘要:
A process for the preparation of 3-amino-1,2-propanediol, commonly known as isoserinol, having an organic impurities content lower than 0.1% and an inorganic impurities content lower than 0.05%.
摘要:
The present invention relates to a process for the preparation of 2-amino-1,3-propanediol, having a content of organic impurities lower than 0.1% and inorganic impurities lower than 0.05%, comprising the following steps:a) formation of a 2-amino-1,3-propanediol salt with an acid;b) crystallization of the salt resulting from step a) from an aqueous or a hydro-organic mixture with a solvent selected from the group consisting of an alcohol of general formula R--OH, wherein R is a C.sub.1 -C.sub.6 straight or branched alkyl chain, and a mono(C.sub.1 -C.sub.3)alkylether of the (C.sub.3 -C.sub.7)alkylcellosolve group;c) elution of the free base by using ion exchangers to give an aqueous solution of said base;d) precipitation or crystallization of the solid 2-amino-1,3-propanediol from a solvent as defined in step b).
摘要:
The present invention refers to a Process for the preparation of S-(-)-5-��2-(acetyloxy)-1-oxopropyl!amino!-2,4,6-triiodo-1,3-benzenedicarboxylic acid dichloride of formula (I) comprising the reaction between S-(-)-�2-(acetyloxy)!propionic acid chloride and 5-amino-2,4,6-triiodo-, 1,3-benzenedicarboxylic acid dichloride, in an aprotic dipolar solvent and in presence of a halogenhydric acid.
摘要:
The present invention relates to a process for recovering copper from solutions from the recovery of iodine from industrial wastes from the production of ionic and non-ionic iodinated X-ray contrast agents by use of chelating resins suitable for removing copper from aqueous solutions. The absorbed copper is displaced by treating the resins with a 10% hydrochloric or sulfuric acid solution.
摘要:
A process for the preparation of S-N,N′-bis[2-hydroxy-1-(hydroxymethyl)ethyl]-5-[(2-hydroxy-1-oxopropyl)amino]-2,4,6-triiodo-1,3-benzenedicarboxamide, comprising the reaction of S-(−)-5-[[2-(acetyloxy)-1-oxopropyl]amino]-2,4,6-triiodo-1,3-benzenedicarboxylic acid dichloride (III) with 2-amino-1,3-propanediol (serinol) without a solvent, followed by hydrolysis of the acetate group.
摘要:
A process for the recovery of iodine from mother liquors or wastes containing iodinated organic compounds, by mineralisation of organic iodine and subsequent transformation of the formed iodide into elementary iodine, characterized in that the aqueous solution is concentrated to a suitable volume before the mineralisation step, under atmospheric pressure and at the boiling temperature, and said solution is purified by nanofiltration.
摘要:
A process for the preparation of 5-[acetyl(2,3-dihydroxypropyl)amino]-N,N'-bis(2,3-dihydroxypropyl)-2,4,6-triiodo-1,3-benzenedicarboxamide of formula (I), starting from 5-amino-1,3-benzenedicarboxylic acid of formula (II), comprising the following steps:step a) is 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: straight or branched (C.sub.7 -C.sub.16) hydrocarbons, (C.sub.7 -C.sub.8) aromatic hydrocarbons, 1,1,1-trichloroethane, n-butyl acetate, diglyme (diethylene glycol dimethyl ether), in the presence of catalytic amounts of a tertiary amine, to give compound (III);step b) is the acetylation reaction of compound (III) with glacial acetic acid both as the solvent and the reagent and thionyl chloride;step c) is the formation of compound (V) by reaction of the compound (IV) with 1-amino-2,3-propanediol, by reaction of compound (IV) in a dipolar aprotic solvent, selected from the group of dimethylformamide (DMF), dimethylacetamide (DMA), dimethylsulfoxide (DMSO) or N-methyl-pyrrolidinone;step d) is the alkylation of the compound (V) in aqueous solution at basic pH, by addition of a sodium hydroxide-calcium hydroxide mixture, with 3-chloro-1,2-propanediol or epichlorohydrin, at a temperature of 40-90.degree. C.
摘要:
This invention refers to a new process for the synthesis of (S)-N,N'-bis�(2-hydroxy-1-(hydroxymethyl)ethyl!-5-�(2-hydroxy-1-oxopropyl!amino!-2,4,6-triiodo-1,3-benzendicarboxamide, of formula (III), ##STR1## starting from 5-amino-2,4,6-triiodo-1,3-benzendicarboxylic acid dichloride characterized by a new step of chromatographic purification through resins of (S)-5-��2-(acetyloxy)-1-oxopropyl!amino!-2,4,6-triiodo-1,3-benzendicarboxylic acid dichloride, which enables the direct conversion to the compound of formula (III), without preventive isolation.