Process for the manufacture of pyrazolones from pyrazolidones

Details Process for the manufacture of pyrazolones from pyrazolidones Process for the manufacture of pyrazolones from pyrazolidones

1976-12-13

1978-03-28

Trousof, Natalie

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

260295L, 260305, 548367, C07D23122, C07D23124, C07D23126

Patent

active

040815978

ABSTRACT:
A process for manufacture of pyrazolones of the formula: ##STR1## wherein R is an aromatic radical and R.sup.1 is an alkyl, carboxylic acid, carbamoyl or carboxylic ester group which comprises treating a pyrazolidone of the formula: ##STR2## wherein R and R.sup.1 have the meanings stated above with hydrogen peroxide in the presence of alkali.
The new process provides a method of manufacture of pyrazolones which avoids the use of .beta.-ketoesters. In many cases it provides a much cheaper route to these valuable compounds than those established in industry.

REFERENCES:
patent: 1723545 (1929-08-01), Finkelstein et al.

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