Process for azo coupling reaction using diazonium salt and coupler having releasing group, and recording material containing the coupler
AssigneeFuji Photo Film Co., Ltd.
InventorsAkinori Fujita, Tetsunori Matsushita
Life of this patent
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Abstract
A process for an azo coupling reaction is provided that has a large coupling reaction rate and an excellent coloring density and exerts high coupling activity using a stable coupler, and a recording material containing the coupler is provided. The process for an azo coupling reaction comprises carrying out a coupling reaction of a diazonium salt and a coupler to make the diazonium salt form color, and the coupler has certain specified structures.
Claims18
A process for an azo coupling reaction comprising carrying out a coupling reaction of a diazonium salt and a coupler to make said diazonium salt form color, said coupler having one of the structures represented by the following general formulae (1), (2) and (3):
- wherein X1, X2, X3 and X4 each independently represents an atomic group necessary for forming a 5-membered aromatic heterocyclic ring;
- Y represents an amino group, a substituted amino group, a hydroxyl group, an alkoxy group, an alkyl group, which may have a substituent, provided that X1 and Y may be combined to form a heterocyclic ring;
- L represents a substituent capable of being released as a carbonium ion upon coupling with said diazonium salt;
- and EWG1 and EWG2each independently represents an electron withdrawing group, provided that EWG1 and EWG2 may be combined to form a heterocyclic ring.
A recording material comprising a coupler having one of structures represented by the following general formulae (1), (2) and (3), and a diazonium salt capable of forming color through a coupling reaction with said coupler:
- wherein X1, X2, X3 and X4 each independently represents an atomic group necessary for forming a 5-membered aromatic heterocyclic ring;
- Y represents an amino group, a substituted amino group, a hydroxyl group, an alkoxy group, an alkyl group, which may have a substituent, provided that X1 and Y may be combined to form a heterocyclic ring;
- L represents a substituent capable of being released as a carbonium ion upon coupling with said diazonium salt;
- and EWG1 and EWG2 each independently represents an electron withdrawing group, provided that EWG1 and EWG2 may be combined to form a heterocyclic ring.
Dependencies are inferred from the claim text.