5-Hydroxy-1-methylpyrazole
Also known as: 1-Methyl-1H-pyrazol-5-ol, 1-Methyl-5-hydroxy-1H-pyrazole, 1-Methyl-5-hydroxypyrazole, 1-Methylpyrazol-5-ol, 3-Hydroxy-2-methylpyrazole, N-Methylpyrazolone
5-Hydroxy-1-methylpyrazole (CAS 33641-15-5) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C4H6N2O and a molecular weight of 98.103 g/mol. Key properties include a melting point of 110-114ºC, a boiling point of 217.7±13.0 °C at 760 mmHg, a density of 1.2±0.1 g/cm3 and a flash point of 85.4±19.8 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 33641-15-5
- Jingsj CID
- J-1051360-7
- Molecular Formula
- C4H6N2O
- Molecular Weight
- 98.103 g/mol
- Category
- Pharma Intermediates
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 110-114ºC |
|---|---|
| Boiling Point | 217.7±13.0 °C at 760 mmHg |
| Density | 1.2±0.1 g/cm3 |
| Flash Point | 85.4±19.8 °C |
| Exact Mass | 98.048012 |
| PSA | 38.05000 |
| LogP | 0.10 |
| Vapor Pressure | 0.1±0.4 mmHg at 25°C |
| Refractive Index | 1.568 |
Customs & Trade Information
| HS Code | 2933199090 |
|---|---|
| Summary | 2933199090. other compounds containing an unfused pyrazole ring (whether or not hydrogenated) in the structure. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:20.0% |
Frequently Asked Questions
What is the CAS number of 5-Hydroxy-1-methylpyrazole?
The CAS number of 5-Hydroxy-1-methylpyrazole is 33641-15-5.
What are the molecular formula and molecular weight of 5-Hydroxy-1-methylpyrazole?
5-Hydroxy-1-methylpyrazole has molecular formula C4H6N2O and molecular weight 98.103 g/mol.
What are the upstream and downstream products of 5-Hydroxy-1-methylpyrazole?
For 5-Hydroxy-1-methylpyrazole, Upstream Products: Methyl 3-methoxyacrylate, Methyl (E)-3-methoxyacrylate.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "5-Hydroxy-1-methylpyrazole (CAS 33641-15-5)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1051360-7 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.