Synthesis of pyrazolotriazole photographic dye forming color cou

Details Synthesis of pyrazolotriazole photographic dye forming color cou Synthesis of pyrazolotriazole photographic dye forming color cou

1998-12-02

1999-12-07

Richter, Johann

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D24918

Patent

active

059986298

ABSTRACT:
Photographic pyrazolotriazole dye forming coupler compound or coupler intermediate compounds can be readily prepared by inducing an elimination-addition reaction between certain pyrazolotriazole compounds and aromatic amines in the presence of an inorganic base or formate. Yields and purity are high, and reaction time is reduced with the specific set of conditions and reactants, and environmental impact from waste is reduced. The resulting compounds can be used themselves as photographic dye forming couplers or further reacted to prepare useful coupler compounds for photographic use.

REFERENCES:
patent: 5183728 (1993-02-01), Romanet et al.
patent: 5457210 (1995-10-01), Kim et al.
patent: 5565572 (1996-10-01), Potenza et al.
patent: 5681691 (1997-10-01), Bose et al.

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