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Names | |||
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Preferred IUPAC name
1H-Pyrazole[1] | |||
Systematic IUPAC name
1,2-Diazacyclopenta-2,4-diene | |||
Other names
1,2-Diazole
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Identifiers | |||
3D model (JSmol)
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103775 | |||
ChEBI | |||
ChEMBL | |||
ChemSpider | |||
DrugBank | |||
ECHA InfoCard | 100.005.471 | ||
EC Number |
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1360 | |||
KEGG | |||
PubChem CID
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UNII | |||
CompTox Dashboard (EPA)
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Properties | |||
C3H4N2 | |||
Molar mass | 68.079 g·mol−1 | ||
Melting point | 66 to 70 °C (151 to 158 °F; 339 to 343 K) | ||
Boiling point | 186 to 188 °C (367 to 370 °F; 459 to 461 K) | ||
Basicity (pKb) | 11.5 | ||
Hazards | |||
GHS labelling:[2] | |||
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Danger | |||
H302, H311, H315, H318, H319, H335, H372, H412 | |||
P260, P261, P262, P264, P264+P265, P270, P271, P273, P280, P301+P317, P302+P352, P304+P340, P305+P351+P338, P305+P354+P338, P316, P317, P319, P321, P330, P332+P317, P337+P317, P361+P364, P362+P364, P403+P233, P405, P501 | |||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Pyrazole is an organic compound of azole group with the formula C3H3N2H. It is a heterocycle characterized by a 5-membered ring of three carbon atoms and two adjacent nitrogen atoms, which are in ortho-substitution. Pyrazole is a weak base, with pKb 11.5 (pKa of the conjugate acid 2.49 at 25 °C).[3] Pyrazoles are also a class of compounds that have the ring C3N2 with adjacent nitrogen atoms.[4] Notable drugs containing a pyrazole ring are celecoxib (celebrex) and the anabolic steroid stanozolol.
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