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2075-45-8 - 4-Bromo-1H-pyrazole, 98+% - H64673 - Alfa Aesar

H64673 4-Bromo-1H-pyrazole, 98+%

CAS Number

Size Price ($) Quantity Availability
25g 67.98
500g 271.92
1kg 440.00
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4-Bromo-1H-pyrazole, 98+%


Chemical Properties

Formula Weight
Melting point
93-96° lit.
Boiling Point
250-260° lit.
Slightly soluble in water.


4-Bromopyrazole may be used in the preparation of 4-bromo-1-(2-chloroethyl)-1H-pyrazole. It may be used as starting material in the synthesis of 1,4?-bipyrazoles. Also used in the synthesis of various pharmaceutical and biologically active compounds, including inhibitors. It is also shown to be one of the 4-substituted pyrazoles, being able to act as inhibitor of liver alcohol dehydrogenase.


Store in cool, dry place in tightly closed container. With adequate ventilation. Store away from oxidizing agent.

Literature References

Guzei IA; and Winter CH. Structural Diversity in the Reaction of Mono- and Disubstituted Pyrazoles with Titanium Tetrachloride. Importance of Hydrogen Bonding and Trends in cis/trans Geometry of Binary Adducts with Unidentate Ligands. Inorg. Chem. 1997 36(20), 4415-4420.

E Alejandre-Durán; M Ruiz-Rubio; R M Claramunt; C López; C Pueyo. Mutagenicity study on pyrazole, seven pyrazole derivatives, and two nitroimidazoles with the L-arabinose resistance test of Salmonella typhimurium. Environmental Mutagenesis.1986 8(4), 611-619.

GHS Hazard and Precautionary Statements

Hazard Statements: H315-H319-H335

Causes skin irritation. Causes serious eye irritation. May cause respiratory irritation.

Precautionary Statements: P261-P280-P305+P351+P338-P304+P340-P362-P312-P321-P405-P403+P233-P501a

Avoid breathing dust/fume/gas/mist/vapours/spray. Wear protective gloves/protective clothing/eye protection/face protection. IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. IF INHALED: Remove to fresh air and keep at rest in a position comfortable for breathing. Take off contaminated clothing and wash before reuse. Call a POISON CENTER or doctor/physician if you feel unwell. Specific treatment (see label). Store locked up. Store in a well-ventilated place. Keep container tightly closed. Dispose of contents/container in accordance with local/regional/national/international regulations.

Other References

Harmonized Tariff Code


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  • H26186

    3,4-Difluorophenylhydrazine hydrochloride, 98%
  • A11992

    Diethylaminosulfur trifluoride, 95%

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