4-Bromo-1H-pyrazole-3-carbonitrile
4-Bromo-1H-pyrazole-3-carbonitrile (CAS: 288246-16-2), with the molecular formula C4H2BrN3 and a molecular weight of 171.98 g/mol, is a halogenated heterocyclic building block. This compound serves as a valuable intermediate in chemical synthesis, particularly for constructing more complex molecules within pharmaceutical research and development. Its pyrazole core and bromine substituent offer versatile reactivity for further chemical modifications.

Pharmaceutical Intermediate
Utilised in the synthesis of novel drug candidates and active pharmaceutical ingredients (APIs). The pyrazole scaffold is a common feature in many biologically active compounds.
Organic Synthesis Reagent
Serves as a key building block for creating diverse organic molecules. Its functional groups allow for various coupling and substitution reactions.
Agrochemical Research
Potential applications in the development of new pesticides and herbicides, leveraging the biological activity often associated with pyrazole derivatives.
Materials Science
Can be incorporated into the synthesis of functional materials, such as organic semiconductors or ligands for metal complexes.
| Molecular weight | 171.98 |
|---|---|
| Empirical formula | C4H2BrN3 |
| Assay | 97% |
| Storage temperature | 2-8°C |
| Melting point | 154-158 °C |


Hazard statements
- H302Harmful if swallowed
- H315Causes skin irritation
- H318Causes serious eye damage
- H335May cause respiratory irritation
Precautionary statements
- P261Avoid breathing dust, fume, gas or vapours
- P280Wear protective gloves, clothing and eye/face protection
- P305IF IN EYES
| Water hazard class (WGK, DE) | 3 |
|---|---|
| Hazard codes (EU) | Xn |
| Risk statements (R) | 22-37/38-41 |
| Safety statements (S) | 26-39 |
Hazard information is provided for guidance. Always consult the product Safety Data Sheet (SDS), available on request, before handling.
Documentation
Every batch ships with a Certificate of Analysis covering assay, identity and purity; the grade is confirmed against your enquiry. Safety Data Sheets and technical data sheets are available on request.
Supply & logistics
Samples for technical evaluation; bulk MOQ by grade and packaging. In-stock material ships in 7–10 working days, worldwide, with full export documentation.
What is 4-Bromo-1H-pyrazole-3-carbonitrile used for?
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This compound is primarily used as a building block in organic synthesis, particularly for pharmaceutical intermediates and agrochemical research. It is valuable for constructing more complex heterocyclic molecules.
What is the CAS number and formula for 4-Bromo-1H-pyrazole-3-carbonitrile?
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The CAS number is 288246-16-2, and the empirical formula is C4H2BrN3.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 4-Bromo-1H-pyrazole-3-carbonitrile with an assay of 97%. This product is supplied for research and laboratory use and is not represented as USP, BP, EP, or other pharmacopoeia grades.
What are the safety and handling precautions for this chemical?
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This compound is classified as Danger, with hazards including H302 (Harmful if swallowed), H315 (Causes skin irritation), H318 (Causes serious eye damage), and H335 (May cause respiratory irritation). Handle with appropriate personal protective equipment in a well-ventilated area. Refer to the Safety Data Sheet for full details.
How is 4-Bromo-1H-pyrazole-3-carbonitrile typically stored and shipped?
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The recommended storage temperature is 2-8°C. As a global supplier, Tech Serve Solutions adheres to all regulations for the safe packing, shipping, and exporting of chemicals.
How can I request a quote or sample?
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To request a quote or sample, please contact the Tech Serve Solutions sales team via our website or direct email, providing your specific requirements.
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