Method for preparing 2-pyrazolin-5-ones from 1,2,4-oxadiazoles

Details Method for preparing 2-pyrazolin-5-ones from 1,2,4-oxadiazoles Method for preparing 2-pyrazolin-5-ones from 1,2,4-oxadiazoles

1980-12-29

1982-08-17

Jiles, Henry R.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

548131, C07D23152, C07D40712

Patent

active

043450857

ABSTRACT:
A method for preparing 2-pyrazolin-5-ones from 1,2,4-oxadiazoles is described. The method comprises forming a liquid reaction system of a base catalyst and a 1,2,4-oxadiazole in an organic liquid reaction medium and heating the reaction system to a temperature sufficient to cause the 1,2,4-oxadiazole to be rearranged to a 2-pyrazolin-5-one.

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patent: 3419391 (1968-12-01), Young
patent: 3927025 (1975-12-01), Korbonits
Boulton et al., J. Chem. Soc. (London), C, 1967, (20), pp. 2005-2007.
Ruccia et al., A New Rearrangement in the 1,2,4-Oxadiazole Series, J. Chem. Soc., Chem. Comm. (1970), p. 866.

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