1-(1-Methyl-1H-pyrazol-5-yl)ethanone
Also known as: 5-Acetyl-1-methylpyrazole, 1-(1-methyl-1H-pyrazol-5-yl)ethan-1-one, Ethanone, 1-(1-methyl-1H-pyrazol-5-yl)-, 1-(2-methylpyrazol-3-yl)ethanone
1-(1-Methyl-1H-pyrazol-5-yl)ethanone (CAS 137890-05-2) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C6H8N2O and a molecular weight of 124.141 g/mol. Key properties include a boiling point of 221.0±13.0 °C at 760 mmHg, a density of 1.1±0.1 g/cm3 and a flash point of 87.4±19.8 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 137890-05-2
- Jingsj CID
- J-1422538-8
- Molecular Formula
- C6H8N2O
- Molecular Weight
- 124.141 g/mol
- Category
- Pharma Intermediates
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Boiling Point | 221.0±13.0 °C at 760 mmHg |
|---|---|
| Density | 1.1±0.1 g/cm3 |
| Flash Point | 87.4±19.8 °C |
| Exact Mass | 124.063660 |
| PSA | 34.89000 |
| LogP | -0.59 |
| Vapor Pressure | 0.1±0.4 mmHg at 25°C |
| Refractive Index | 1.543 |
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 1-(1-Methyl-1H-pyrazol-5-yl)ethanone?
The CAS number of 1-(1-Methyl-1H-pyrazol-5-yl)ethanone is 137890-05-2.
What are the molecular formula and molecular weight of 1-(1-Methyl-1H-pyrazol-5-yl)ethanone?
1-(1-Methyl-1H-pyrazol-5-yl)ethanone has molecular formula C6H8N2O and molecular weight 124.141 g/mol.
What are the upstream and downstream products of 1-(1-Methyl-1H-pyrazol-5-yl)ethanone?
For 1-(1-Methyl-1H-pyrazol-5-yl)ethanone, Upstream Products: 1-Methyl-1H-pyrazole-5-carboxylic acid, 1-Methyl-1H-pyrazole-5-carbonyl chloride, 1-Methyl-1H-pyrazole-5-carbonitrile.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "1-(1-Methyl-1H-pyrazol-5-yl)ethanone (CAS 137890-05-2)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1422538-8 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.