Process for preparing diazonium salts of 3-amino-pyrazole

Details Process for preparing diazonium salts of 3-amino-pyrazole Process for preparing diazonium salts of 3-amino-pyrazole

1979-05-23

1981-05-19

Higel, Floyd D.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260156, 260162, 260163, 546135, 548162, 548375, 548377, C07C10700, C07C10704, C07C10708, C07C11304

Patent

active

042684366

ABSTRACT:
3-Diazonium salts of pyrazole, useful as intermediates in the preparation of azo dyes are obtained by an oxidative diazotization of 3-amino-pyrazolines with nitrous acid or with nitrosyl-sulphuric acid. The 3-diazonium salts of pyrazole have the following structure: ##STR1## wherein: X is a radical --CO-- or --COO--,

REFERENCES:
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patent: 3793305 (1974-02-01), Balon
patent: 3822247 (1974-07-01), Ozutsumi et al.
patent: 4149005 (1979-04-01), Battisti et al.
Iwanoff, Ber. Deut. Chem. Gesell., vol. 87, pp. 1600-1604 (1954).
Reimlinger et al., Ber. Deut. Chem. Gesell., vol. 94, pp. 1036-1041 (1961).
Houben-Weyl, "Methoden der Organischen Chemie", vol. X/3, pp. 58-66 (1965).

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