Process for the preparation of pyrazolones

Details Process for the preparation of pyrazolones Process for the preparation of pyrazolones

1996-10-29

1997-09-02

Ramsuer, Robert W.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

5483711, C07D23120, C07D23122

Patent

active

056633653

ABSTRACT:
A process for the preparation of pyrazolone derivatives represented by the general formula ##STR1## wherein R is a hydrogen atom, an alkyl group, an allyl group, an aryl group or an aralkyl group, and R.sub.1 and R.sub.2 are, respectively, a hydrogen atom, an alkyl group or a phenyl group which may have a substituent, comprising reacting a 2,3-dihalocarboxylic acid derivative or a 2-haloacrylic acid derivative with a hydrazine derivative. A pyrazolone or 1-substituted-3-pyrazolones useful as intermediate starting materials for the synthesis of agricultural chemicals, medicine and chemical compounds can be easily and cheaply prepared from widely used industrial starting materials.

REFERENCES:
Wiley et al. "Pyrazolones, Pyrazolidenes, and Derivatives" (1964) p. 10.

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