Process for the preparation of pyrazole

Details Process for the preparation of pyrazole Process for the preparation of pyrazole

1981-09-08

1984-02-28

Ford, John M.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

548379, C07D23112

Patent

active

044342926

ABSTRACT:
Process for the preparation of pyrazole from hydrazine hydrate and acrolein comprising reacting hydrazine hydrate with acrolein in an aqueous-organic medium at a temperature between 20.degree.-80.degree. C. and then oxidizing the 2-pyrazoline formed, of the formula ##STR1## either directly or after first being isolated, with chlorine or an alkali metal hypochlorite or an alkaline earth metal hypochlorite and water or an aqueous-organic medium at a temperature between 0.degree. and 60.degree. C.

REFERENCES:
patent: 2515160 (1950-07-01), Copenhaver
Wirsing, Journal f/u/ r Praktische Chemie, 1894, vol. 50, pp. 531-554.
Wolfe et al., Chem. Abst., 1971, vol. 74, No. 35102q.
MacLean, Chem. Abst., 1969, vol. 70, No. 28391x.

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