3-Methyl-5-pyrazolone
Also known as: 3-Methyl-2-pyrazolin-5-one, 2,4-Dihydro-5-methyl-3H-pyrazol-3-one, 5-Methyl-2,4-dihydro-3H-pyrazol-3-one, 3-Methyl-1H-pyrazol-5(4H)-one, 3-Methyl-4,5-dihydro-1H-pyrazole-5-one
3-Methyl-5-pyrazolone (CAS 108-26-9) 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 220-224 °C, a boiling point of 309.7ºC at 760 mmHg, a density of 1.3±0.1 g/cm3 and a flash point of 141.1ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 108-26-9
- Jingsj CID
- J-27706-5
- 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 | 220-224 °C |
|---|---|
| Boiling Point | 309.7ºC at 760 mmHg |
| Density | 1.3±0.1 g/cm3 |
| Flash Point | 141.1ºC |
| Exact Mass | 98.048012 |
| PSA | 41.46000 |
| LogP | -1.08 |
| Vapor Pressure | 0.000345mmHg at 25°C |
| Refractive Index | 1.599 |
| Storage Conditions | 2~8°C |
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 3-Methyl-5-pyrazolone?
The CAS number of 3-Methyl-5-pyrazolone is 108-26-9.
What are the molecular formula and molecular weight of 3-Methyl-5-pyrazolone?
3-Methyl-5-pyrazolone has molecular formula C4H6N2O and molecular weight 98.103 g/mol.
What are the upstream and downstream products of 3-Methyl-5-pyrazolone?
For 3-Methyl-5-pyrazolone, Upstream Products: Ethyl acetoacetate, 4-Chlorobenzaldehyde, Malononitrile; Downstream Products: 4,4-Dibromo-3-methyl-2-pyrazolin-5-one, 3-Methyl-1-p-tolyl-5-pyrazolone, 1,5-Dimethyl-2,3-dihydro-1H-pyrazol-3-one.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "3-Methyl-5-pyrazolone (CAS 108-26-9)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-27706-5 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.