US8962886B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-8962886-B2 |
| Application number | US-62155109-A |
| Country | US |
| Kind code | B2 |
| Filing date | Nov 19, 2009 |
| Priority date | Jul 21, 2009 |
| Publication date | Feb 24, 2015 |
| Grant date | Feb 24, 2015 |
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This invention relates to the synthesis of iodixanol (1,3-bis(acetamido)-N,N′-bis[3,5-bis(2,3-dihydroxypropylaminocarbonyl)-2,4,6-triiodophenyl]-2-hydroxypropane), more specifically to the dimerisation of 5-acetamido-N,N′-bis(2,3-dihydroxypropyl)-2,4,6-triiodo-isophthalamide with methanol as solvent.
Opening claim text (preview).
We claim: 1. A process for the dimerisation of 5-acetamido-N,N′-bis (2,3-dihydroxypropyl)-2,4,6-triiodoisophthalamide (Compound A) in a temperature range of about 10 to about 20° C. using methanol as solvent in a concentration of about 0.8 to 2.0 ml solvent per g Compound A in the presence of about 0.30 to 0.36 mole equivalents of epichlorohydrin relative to Compound A, and wherein the reaction solution has a pH value of about 11.5 to about 12.2, whereby the pH is varied throughout…
Chemistry & Metallurgy · mapped topic
Chemistry & Metallurgy · mapped topic
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