Method for synthesizing a magenta coupler by selectively etherifying 4-hydroxy-5-pyrazolone
US4692529A · kind A · utility
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6Claims
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Key dates
| Filing date | Nov 10, 1983 |
| Grant date | Sep 8, 1987 |
| Priority date | — |
| Expiry date | Nov 10, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D231/28
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A method for synthesizing a magenta coupler. The synthesis is carried out through (1) 3-pyrazoline-5-ones which are obtained by substituting a blocking group at the nitrogen atom in the second position thereof; or (2) pyrazoles which are obtained by substituting a blocking group at the hydroxyl group bonded in the fifth position thereof. The magenta coupler obtained has the formula ##STR1## wherein R.sub.1 is an aryl or heterocyclic group, R.sub.2 is an acylamide, anilino or ureido group, and R3 is an alkyl, aryl, or heterocyclic group.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.