Process for the production of 2-equivalent yellow couplers
AssigneeAgfa-Gevaert
InventorsGunter Renner, Quirin Scheben
Life of this patent
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Abstract
.alpha.-Acylacetamide 2-equivalent yellow couplers may be prepared by reacting .alpha.-halo-.alpha.-acyl-acetamides with phenols or NH-acidic organic compounds in the presence of a non-alkylatable bicyclic nitrogen-containing base, such as 1,5-diazabicyclo[4,3,0]non-5-ene or 1,8-diazabicyclo[5,4,0]-undec-7-ene.
Claims5
The process for the production of a 2-equivalent .alpha.-acylacetamide yellow coupler substituted in the .alpha.-position with an organic substituent selected from the group consisting of phenoxy groups and groups derived from NH acidic organic compounds by removal of the acidic hydrogen atom in which process a 2-equivalent .alpha.-halo-.alpha.-acylacetamide yellow coupler is reacted with a compound selected from the group consisting of phenols and NH-acidic organic compounds in the presence of a basic condensing agent, in which process the improvement comprises using as basic condensing agent a non-alkylatable bicyclic nitrogen-containing base containing from 6 to 14 carbon atoms and at least 2 nitrogen atoms.
Dependencies are inferred from the claim text.