5-Hydroxy-1-methyl-1H-pyrazole
5-Hydroxy-1-methyl-1H-pyrazole (CAS 33641-15-5, C4H6N2O) is a heterocyclic organic compound with a molecular weight of 98.10 g/mol. This pyrazole derivative serves as a versatile building block in chemical synthesis. It is primarily utilised in the development of novel compounds and research applications within the pharmaceutical and chemical industries, owing to its reactive functional groups.
- IUPAC
- 1-Methyl-1H-pyrazol-5-ol,1-Methyl-5-hydroxy-1H-pyrazole,1-Methyl-5-hydroxypyrazole,1-Methylpyrazol-5-ol,2-Methyl-2H-pyrazol-3-ol,5-Hydroxy-1-methylpyrazole
- Synonyms
- 1-Methyl-1H-pyrazol-5-ol1-Methyl-5-hydroxy-1H-pyrazole1-Methyl-5-hydroxypyrazole1-Methylpyrazol-5-ol2-Methyl-2H-pyrazol-3-ol5-Hydroxy-1-methylpyrazole

Chemical Synthesis Intermediate
Utilised as a key intermediate in the synthesis of more complex organic molecules. Its structure allows for diverse chemical transformations.
Pharmaceutical Research
Employed in medicinal chemistry for the discovery and development of new therapeutic agents. The pyrazole core is found in various biologically active compounds.
Heterocyclic Chemistry
Serves as a valuable building block for constructing various heterocyclic systems. Useful in academic and industrial research laboratories.
| Molecular weight | 98.10 |
|---|---|
| Empirical formula | C4H6N2O |
| Assay | 95% |
| Melting point | 110-114 °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
| Protective equipment | dust mask type N95 (US), Eyeshields, Gloves |
|---|---|
| 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 5-Hydroxy-1-methyl-1H-pyrazole used for?
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5-Hydroxy-1-methyl-1H-pyrazole is primarily used as a building block in chemical synthesis and in pharmaceutical research for the development of new compounds.
What are the CAS number and formula for 5-Hydroxy-1-methyl-1H-pyrazole?
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The CAS number for 5-Hydroxy-1-methyl-1H-pyrazole is 33641-15-5, and its molecular formula is C4H6N2O.
What grade and purity does Tech Serve Solutions supply?
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Tech Serve Solutions supplies 5-Hydroxy-1-methyl-1H-pyrazole with an assay of 95%. This product is suitable for research and chemical synthesis purposes. We do not represent it as USP, BP, or EP grade.
What are the safety considerations when handling 5-Hydroxy-1-methyl-1H-pyrazole?
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This compound is classified with Danger signal word and carries hazard statements H302 (Harmful if swallowed), H315 (Causes skin irritation), H318 (Causes serious eye damage), and H335 (May cause respiratory irritation). Appropriate personal protective equipment, including a dust mask type N95, eyeshields, and gloves, should be used. Ensure good ventilation.
How is 5-Hydroxy-1-methyl-1H-pyrazole shipped and exported?
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Tech Serve Solutions is a global supplier and exporter of fine chemicals, including 5-Hydroxy-1-methyl-1H-pyrazole, adhering to international shipping and export regulations.
How can I request a sample or quote for 5-Hydroxy-1-methyl-1H-pyrazole?
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To request a sample or a quote, please use the contact form on our website or reach out to our sales team directly, referencing the product name and CAS number.
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