US4133955A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of 2-equivalent yellow couplers
Assignee: Agfa Gevaert AG
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Filing: 1976-10-06
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Granted: 1979-01-09
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Expires: 1996-10-06
Abstract
Abstract A one-stage process for the production of a 2-equivalent acylacetamide yellow coupler, in which one hydrogen atom of the α-methylene group of the acyl acetamide coupler molecule is substituted by a group which is attached through an oxygen or nitrogen atom and which can be split off during chromogenic development with an oxidized color developer containing a primary aromatic amino group, which process is carried out by reacting A 4-equivalent acylacetamide yellow coupler with A compound containing an aromatic hydroxyl group or an --NH-- group in a heterocyclic ring In the presence of a halogen, or an agent which releases halogen, and A basic condensation agent In a substantially aprotic solvent.
Inventors
- 👤 Gunter Renner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:10
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/305; G03C7/30511; G03C7/30517; G03C7/30535; C; C07; C07D; C07D239/00; C07D239/70; C07D239/72; C07D239/86; C07D239/88; C07D253/00; C07D253/08
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
117 words
In the process of converting a photographic 4-equivalent acyl acetamide yellow coupler to a 2-equivalent yellow coupler by a treatment that includes a reaction with a splittable-group-containing compound under basic condensation conditions that cause the active methylene carbon of the acyl acetamide to be substituted with a phenoxy or a heterocyclic ##STR6## which will split off during chromogenic photographic development, the improvement according to which the conversion to a 2-equivalent coupler is effected in a single reaction stage by reacting the 4-equivalent coupler in a substantially aprotic solvent with the splittable-group-containing compound, and a halogen under the basic condensation conditions to cause the splittable group to substitute directly on the active methylene of the 4 -equivalent coupler.
Claim 2
Dependent Claim
117 words
In the process of converting a photographic 4-equivalent acyl acetamide yellow coupler to a 2-equivalent yellow coupler by a treatment that includes a reaction with a splittable-group-containing compound under basic condensation conditions that cause the active methylene carbon of the acyl acetamide to be substituted with a phenoxy or a heterocyclic ##STR6## which will split off during chromogenic photographic development, the improvement according to which the conversion to a 2-equivalent coupler is effected in a single reaction stage by reacting the 4-equivalent coupler in a substantially aprotic solvent with the splittable-group-containing compound, and a halogen under the basic condensation conditions to cause the splittable group to substitute directly on the active methylene of the 4 -equivalent coupler.
Claim 3
Dependent Claim
13 words
The combination of claim 1 in which the halogen is bromine or iodine.
Claim 4
Dependent Claim
13 words
The combination of claim 1 in which the halogen is formed in situ.
Claim 5
Dependent Claim
28 words
The combination of claim 3 in which the halogen is formed by the interaction of a halide with an oxidizing agent that liberates the halogen from the halide.
Claim 6
Dependent Claim
21 words
The combination of claim 1 in which the reaction is effected at a temperature of from -20° C. to +100° C.
Claim 7
Dependent Claim
20 words
The combination of claim 2 in which the reaction is effected at a temperature from +5° C. to +20° C.
Claim 8
Dependent Claim
14 words
The combination of claim 1 in which the solvent is substantially a polar solvent.
Claim 9
Dependent Claim
24 words
The combination of claim 1 in which the splittable-group containing compound is a phenol substituted in paraposition by an acyl, carbamyl or sulfamyl radical.
Claim 10
Dependent Claim
32 words
The combination of claim 1 in which the splittable-group-containing compound has a 5- or 6-membered heterocyclic ring of carbon and nitrogen atoms with an NH adjacent to a ##STR7## or --CO-- structure.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-08 | 1982-07-10 | 1983-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-08 | 1986-07-10 | 1987-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-08 | 1990-07-10 | 1991-01-09 | $7700.00 | Window Closed / Lapsed |