Claims
- 1. A photographic coupler represented by the formulae:
- COUP--T.sup.1 --T.sup.2 --(T.sup.3).sub.b --PUG
- wherein
- COUP is a coupler moiety having a coupling site to which T.sup.1 is attached;
- T.sup.1 is a timing or linking group which releases from COUP during processing and which functions by electron transfer down a conjugated or unconjugated chain, or by nucleophilic displacement reaction, to release T.sup.2, T.sup.2 being an indazole timing or linking group which, after release from T.sup.1, functions by electron transfer down a conjugated chain to release T.sup.3 or PUG, and which is represented by the formula: ##STR24## wherein ** denotes the point of attachment to T.sup.1 and *** denotes the point of attachment to T.sup.3 or PUG;
- R.sup.1 and R.sup.2 are independently selected from hydrogen, an aliphatic, carbocyclic, and heterocyclic group, or may be bonded together to form a 5, 6, or 7 membered ring;
- V is independently selected from the group consisting of an alkyl, carbocyclic, heterocyclic, halo, carbamoyl, sulfamoyl, carbonamido, sulfonamido, keto, sulfo, nitro, hydroxyl, carboxyl, amino, alkoxy, alkoxycarbonyl, aryloxy, and arylthio group;
- q is 0, 1, 2, 3 or 4;
- T.sup.3 is a timing or linking group attached to T.sup.2 which is released therefrom after T.sup.2 releases from T.sup.1, and which functions by electron transfer down a conjugated or unconjugated chain, or by nucleophilic displacement reaction, to release PUG;
- b is 0 or 1; and
- PUG is a photographically useful group.
- 2. A photographic coupler represented by the formula: ##STR25## wherein COUP is a coupler moiety;
- R.sup.1 and R.sup.2 are independently selected from hydrogen, an aliphatic, carbocyclic, and heterocyclic group, or may be bonded together to form a 5, 6, or 7 membered ring;
- V is independently selected from the group consisting of an alkyl, carbocyclic, heterocyclic, halo, carbamoyl, sulfamoyl, carbonamido, sulfonamido, keto, sulfo, nitro, hydroxyl, carboxyl, amino, alkoxy, alkoxycarbonyl, aryloxy, and arylthio group;
- q is 0, 1, 2, 3 or 4;
- Nu.sup.2 is a nucleophilic group;
- R.sup.6, R.sup.7 and R.sup.8 are independently selected from hydrogen, an aliphatic, carbocyclic, and heterocyclic group, or two of R.sup.6, R.sup.7 and R.sup.8 may be bonded together in a pair to form a 5, 6, or 7 membered ring; and
- r is selected from 0, 1, 2, 3, 4 or 5 and;
- PUG is a photographically useful group.
CROSS REFERENCE TO RELATED APPLICATION
This is a Divisional of application Ser. No. 08/590,661, filed Jan. 24, 1996, now U.S. Pat. No. 5,686,234, for which reference is made to and priority claimed from U.S. Provisional Application Ser. No. 60/000,766, filed Jun. 30, 1995, entitled PHOTOGRAPHIC ELEMENT CONTAINING A COUPLER CAPABLE OF RELEASING A PHOTOGRAPHICALLY USEFUL GROUP and U.S. Provisional Application Ser. No. 60/002,984, filed Aug. 30, 1995, entitled PHOTOGRAPHIC ELEMENT CONTAINING A COUPLER CAPABLE OF RELEASING A PHOTOGRAPHICALLY USEFUL GROUP.
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Divisions (1)
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Number |
Date |
Country |
Parent |
590661 |
Jan 1996 |
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