1H-Pyrazole-3-carboxylic acid
1H-Pyrazole-3-carboxylic acid (CAS: 1621-91-6; Formula: C4H4N2O2; MW: 112.09 g/mol) is a heterocyclic organic compound. It serves as a valuable building block in chemical synthesis, particularly within the realm of pyrazole chemistry. This compound is frequently employed in the development of novel molecules for pharmaceutical and agrochemical research, owing to the versatile reactivity of the pyrazole ring system. Available at a purity of 97%.

Pharmaceutical Intermediate
Utilised as a key structural component in the synthesis of potential drug candidates. Its pyrazole core is present in various biologically active molecules.
Agrochemical Research
Serves as a precursor in the development of new pesticides and herbicides, leveraging the heterocyclic scaffold for targeted biological activity.
Organic Synthesis Reagent
A versatile building block for constructing complex organic molecules. It enables the introduction of the pyrazole moiety into larger structures.
Material Science
Investigated for its potential incorporation into functional materials due to the electronic properties of the pyrazole ring.
| Molecular weight | 112.09 |
|---|---|
| Empirical formula | C4H4N2O2 |
| Assay | 97% |
| Melting point | 204-213 °C |

Hazard statements
- H315Causes skin irritation
| Protective equipment | dust mask type N95 (US), Eyeshields, Gloves |
|---|---|
| Hazard codes (EU) | Xi |
| Risk statements (R) | 38 |
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 1H-Pyrazole-3-carboxylic acid used for?
+
1H-Pyrazole-3-carboxylic acid is primarily used as a building block in organic synthesis, particularly for pharmaceutical and agrochemical research. It is also explored in material science.
What is the CAS number and formula for 1H-Pyrazole-3-carboxylic acid?
+
The CAS number is 1621-91-6 and the empirical formula is C4H4N2O2.
What grade and purity does Tech Serve Solutions supply?
+
Tech Serve Solutions supplies 1H-Pyrazole-3-carboxylic acid with an assay of 97%. This is a technical/research grade product, and TSS does not represent it as USP, BP, or EP grade.
How should 1H-Pyrazole-3-carboxylic acid be handled?
+
Handle 1H-Pyrazole-3-carboxylic acid with appropriate personal protective equipment, including a dust mask (type N95 US recommended), eyeshields, and gloves. Avoid dust formation and ensure adequate ventilation. It carries a Warning signal word and is classified with H315 hazard statement (Causes skin irritation).
Is 1H-Pyrazole-3-carboxylic acid a controlled substance?
+
Based on the provided data, there is no indication that 1H-Pyrazole-3-carboxylic acid is a controlled substance.
How is 1H-Pyrazole-3-carboxylic acid packed and shipped?
+
Tech Serve Solutions exports fine chemicals globally. Specific packing and shipping details are available upon request and are tailored to meet international shipping regulations and customer requirements.
How can I request a sample or quote for 1H-Pyrazole-3-carboxylic acid?
+
To request a sample or a quote, please contact the Tech Serve Solutions sales team through the website or by phone, providing the product name and CAS number (1621-91-6).
▶ Related products

1-(2-Fluorobenzyl)piperazine
C11H15FN2
Chemical Synthesis
1-(2-Fluorophenyl)biguanide hydrochloride
Chemical Synthesis

1-(2-Fluorophenyl)cyclopropanecarboxylic acid
C10H9FO2
Chemical Synthesis
1-(2-Fluorophenyl)piperazine
C10H13FN2
Chemical Synthesis
1-(2-Fluorophenyl)piperazine monohydrochloride
C10H13FN2 · HCl
Chemical Synthesis
1-(2-Furoyl)-1H-benzotriazole
C11H7N3O2
Chemical Synthesis
1-(2-Furoyl)piperazine
C9H12N2O2
Chemical Synthesis
1-(2-Hydroxy-5-methylphenyl)-3-phenyl-1,3-propanedione
Chemical Synthesis
▶ Explore more

3-Methyl-1,5-di-p-tolyl-1,4-pentazadiene
Chemical Synthesis

3-Methyl-1,5-pentanediol
Chemical Synthesis

3-Methyl-1-(2-methylphenyl)-1H-pyrazol-5-amine
C11H13N3
Chemical Synthesis
3-Methyl-1-(3′-sulfoamidophenyl)-5-pyrazolone
C10H11N3O3S
Chemical Synthesis