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IUPAC name Pyrazole
Other names 1,2-diazole
CAS number 288-13-1
Molecular formula C3H4N2
Molar mass 68.07 g/mol
Melting point

66-70 °C

Boiling point

168-188 °C

Except where noted otherwise, data are given for
materials in their standard state
(at 25 °C, 100 kPa)

Infobox disclaimer and references

Pyrazole refers both to the class of simple aromatic ring organic compounds of the heterocyclic series characterized by a 5-membered ring structure composed of three carbon atoms and two nitrogen atoms in adjacent positions and to the unsubstituted parent compound. Being so composed and having pharmacological effects on humans, they are classified as alkaloids, although they are rare in nature.


Pyrazoles are produced synthetically through the reaction of α,β-unsaturated aldehydes with hydrazine and subsequent dehydrogenation.

In medicine, pyrazoles are used for their analgesic, anti-inflammatory, antipyretic, antiarrhythmic, tranquilizing, muscle relaxing, psychoanaleptic, anticonvulsant, monoamineoxidase inhibiting, antidiabetic and antibacterial activities.

Pyrazoles react with potassium borohydride to form a class of ligands known as Scorpionates.

Structurally related compounds are pyrazoline and pyrazolidine.

See also

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Pyrazole". A list of authors is available in Wikipedia.
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