3-Methyl-5-pyrazolone
3-Methyl-5-pyrazolone (CAS: 108-26-9; Formula: C4H6N2O; MW: 98.10 g/mol) is a heterocyclic organic compound. This fine chemical functions as a versatile building block in organic synthesis, particularly for the construction of pyrazole derivatives. It is widely utilised in the chemical industry for various synthesis applications, contributing to the development of diverse chemical entities.
- IUPAC
- 2,4-Dihydro-5-methyl-3H-pyrazol-3-one,3-Methyl-2-pyrazolin-5-one
- Synonyms
- 2,4-Dihydro-5-methyl-3H-pyrazol-3-one3-Methyl-2-pyrazolin-5-one

Organic Synthesis Intermediate
Serves as a crucial intermediate in the synthesis of more complex organic molecules, including pharmaceuticals and agrochemicals. Its pyrazolone structure allows for diverse functionalisation and ring-system construction.
Heterocyclic Chemistry
A valuable building block for creating substituted pyrazoles and other heterocyclic compounds. It is employed in research and development for novel compound discovery.
Dye and Pigment Precursor
Can be used in the synthesis of certain dyes and pigments, leveraging the chromophoric properties of pyrazolone derivatives.
| Molecular weight | 98.10 |
|---|---|
| Empirical formula | C4H6N2O |
| Assay | 99.0-100.3% (w/w) (T) |
| Melting point | 217.0-223.0 °C |
| Protective equipment | Eyeshields, Gloves, type N95 (US), type P1 (EN143) respirator filter |
|---|---|
| Water hazard class (WGK, DE) | 3 |
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 3-Methyl-5-pyrazolone used for?
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3-Methyl-5-pyrazolone is primarily used as a versatile building block in organic synthesis, particularly for the creation of pyrazole derivatives, and in the development of dyes and pigments.
What are the CAS number and formula for 3-Methyl-5-pyrazolone?
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The CAS number for 3-Methyl-5-pyrazolone is 108-26-9, and its empirical formula is C4H6N2O.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 3-Methyl-5-pyrazolone with an assay of 99.0-100.3% (w/w) (T). We do not represent this product as USP, BP, EP, or pharmaceutical grade unless explicitly stated.
What are the safety and handling recommendations for 3-Methyl-5-pyrazolone?
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Handling 3-Methyl-5-pyrazolone requires appropriate personal protective equipment, including eyeshields, gloves, and a respirator filter (type N95 or P1). The substance is classified with WGK Germany of 3, indicating a high hazard to water.
How is 3-Methyl-5-pyrazolone packed and shipped?
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3-Methyl-5-pyrazolone is expertly packed and exported by Tech Serve Solutions, adhering to international shipping regulations for chemical compounds.
How can I request a sample or quote for 3-Methyl-5-pyrazolone?
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To request a sample or a quote for 3-Methyl-5-pyrazolone, please contact the Tech Serve Solutions sales team through our website or by phone.
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