Process for the preparation of pyrazole

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

1981-09-08

1983-12-27

Milestone, Norma S.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D23112

Patent

active

044232250

ABSTRACT:
Process for the preparation of pyrazole by heating a pyrazoline derivative of the general formula ##STR1## in which R represents an optionally substituted phenyl radical, or an alkyl or halogenoalkyl radical, without the addition of an acid or base, at a temperature between 100.degree. and 200.degree. C. under a pressure between 1 mbar and 10 bars, optionally in the presence of a diluent.

REFERENCES:
patent: 2515160 (1950-07-01), Copenhaver
Luttringhaus et al., Berichte 1959, vol. 92, pp. 1756-1765.
Ege, Tetrahedron Letters 1963, vol. 25, pp. 1665-1666.

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