Non-ionic polyol contrast media from ionic contrast media
US4954348A · kind A · utility
2Cited by
6References
2Claims
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Key dates
| Filing date | Jul 1, 1988 |
| Grant date | Sep 4, 1990 |
| Priority date | — |
| Expiry date | Jul 1, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C233/16
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
Novel non-ionic contrast media of a hitherto unknown combination of low osmolality and low viscosity are efficiently prepared from generally available ionic contrast media or non-iodinated precursors. Particularly, polyhydroxyhalo-hydrocarbons are employed with a triiodo-substituted acylamido benzoic acids in aqueous weakly basic media to selectively substitute the amido nitrogen, followed by activation of the carboxyl group for amide formation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.