4-Pyridinio-5-pyrazolone salts, process for their preparation an

Details 4-Pyridinio-5-pyrazolone salts, process for their preparation an 4-Pyridinio-5-pyrazolone salts, process for their preparation an

1974-09-17

1976-05-11

Randolph, John D.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

96 565, 96100, 260287D, 2602948D, 2602948R, 260295E, 260296R, 260310A, C07D21338, C07D21340

Patent

active

039563391

ABSTRACT:
4-Pyridinio-5-pyrazolone salts useful as dyes and particularly useful as intermediates for photographic couplers and processes for the preparation thereof.

REFERENCES:
Klingsberg, Pyridine and Its Derivatives, Vol. 2, pp. 2-3 and 11 to 13, Interscience Publishers, NY (1961).
Wiley et al., "Pyrazoles, Pyrazolines, Pyrazolidines, Indazoles And Condensed Rings", pp. 102 to 104, Interscience Publishers, NY, 1967.
Chemical Abstracts, Vol. 79, Abst. No. 146,556p (1973), (English Abst. of Japanese Patent No. 73-05,899 above cited).
Chemical Abstracts, Vol. 69, Abst. No. 96566n (1968), (Abst. of Stashkevich et al.).

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