Preparation of azomethines by reacting a 4,4-dihalo-5-pyrazolone

Details Preparation of azomethines by reacting a 4,4-dihalo-5-pyrazolone Preparation of azomethines by reacting a 4,4-dihalo-5-pyrazolone

1971-12-10

1976-04-20

Higel, Floyd D.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

96 66HD, 260310R, 260163, C07d 4916, C09b 2938

Patent

active

039520099

ABSTRACT:
4,4-Dihalo-5-pyrazolones react with unoxidized aromatic primary aromatic amines or alkyl or hydrazines to give azomethine dyes, azo dyes or hydrazones which are useful in photographic systems.

REFERENCES:
curtin et al, J. Am. Chem. Soc., Vol. 83, pp. 3474 to 3481 (1961).
Houben-Weyl, "Methoden Der Organischen Chemie", Vol. X/2, pp. 414 to 417 (1967).
Theilheimer, "Synthetic Methods of Organic Chemistry," Vol. 21, p. 219, paragraph No. 455 (1967).
Zagorevskii et al., Chemical Abstracts, Vol. 61, p. 8264, (1964).

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