Preparation of 4-chloropyrazoles

Details Preparation of 4-chloropyrazoles Preparation of 4-chloropyrazoles

1989-10-30

1991-09-10

Lee, Mary C.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

548376, C07D23114

Patent

active

050475517

ABSTRACT:
4-Chloropyrazoles of the general formula I ##STR1## where R.sup.1, R.sup.2 and R.sup.3 are each independently of the others hydrogen or a radical which is inert under the reaction conditions, are prepared by reacting pyrazoles of the general formula II ##STR2## wherein R.sup.1, R.sup.2 and R.sup.3 are each as defined above, with 0.95-10 equivalents of hypochloric acid, or salts thereof, in the substantial absence of any carboxylic acid.

REFERENCES:
Liebigs Annalen der Chemie, 598 (1956), pp. 186-197.

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