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1. (WO1991017994) DESULFURIZATION OF TRIAZOLOTHIADIAZINES
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1991/017994 International Application No.: PCT/US1991/003553
Publication Date: 28.11.1991 International Filing Date: 22.05.1991
IPC:
C07D 487/04 (2006.01) ,C07D 513/04 (2006.01)
C CHEMISTRY; METALLURGY
07
ORGANIC CHEMISTRY
D
HETEROCYCLIC COMPOUNDS
487
Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, not provided for by groups C07D451/-C07D477/183
02
in which the condensed system contains two hetero rings
04
Ortho-condensed systems
C CHEMISTRY; METALLURGY
07
ORGANIC CHEMISTRY
D
HETEROCYCLIC COMPOUNDS
513
Heterocyclic compounds containing in the condensed system at least one hetero ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for in groups C07D463/, C07D477/232
02
in which the condensed system contains two hetero rings
04
Ortho-condensed systems
Applicants:
EASTMAN KODAK COMPANY [US/US]; 343 State Street Rochester, NY 14650-2201, US
Inventors:
KIM, Chang, Kyu; US
LAMICELA, Wayne, N.; US
ALLEN, David, L.; US
Agent:
LINN, Robert, A.; 343 State Street Rochester, NY 14650-2201, US
Priority Data:
527,98224.05.1990US
Title (EN) DESULFURIZATION OF TRIAZOLOTHIADIAZINES
(FR) DESULFURATION DE TRIAZOLOTHIADIAZINES
Abstract:
(EN) Pyrazolotriazoles such as 3,6-disubstituted-1H-pyrazolo[5,1-c]-1,2,4-triazoles (II) are useful in the photographic arts, e.g. as magenta couplers. They may be made from 3,6-disubstituted-7H-1,2,4-triazolo[3,4-b][1,3,4]thiadiazines (I) by a two-step process. The first step comprises a ring contraction and a diacylation. The second step comprises hydrolysis of the acyl groups and desulfurization. The second step is conducted using an aqueous mixture of a hydrohalic acid such as hydrochloric acid and hypophosphorous acid, H3PO2. When the hypophosphorous acid is used, less sulfur and sulfur-containing impurities are formed.
(FR) Des pyrazolotriazoles tels que les 1H-pyrazolo[5,1-c]-1,2,4-triazoles disubstituées en position 3 et 6 de la formule (II) sont utiles dans les arts photographiques, par exemple en tant que coupleurs de magenta. On peut les obtenir à partir de 7H-1,2,4-triazolo[3,4-b][1,3,4]thiadiazines disubstituées en position 3 et 6 de la formule (I), selon un procédé à deux étapes. La première étape consiste en une contraction cyclique et en une diacylation. La seconde étape consiste en l'hydrolyse des groupes acyle et en une désulfuration. La seconde étape est mise en oeuvre à l'aide d'un mélange aqueux d'un acide hydrohalique tel que l'acide chlorhydrique et l'acide hypophosphoreux, H3PO2. Lorsque l'on utilise l'acide hypophosphoreux, moins de soufre et d'impuretés contenant du soufre se forment.
Designated States: JP
European Patent Office (AT, BE, CH, DE, DK, ES, FR, GB, GR, IT, LU, NL, SE)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
EP0484503