1,3-Dimethyl-5-pyrazolone
Also known as: 1,3-dimethyl-2-pyrazolin-5-one, 2,5-dimethyl-4H-pyrazol-3-one, 2,4-dihydro-2,5-dimethyl-3H-pyrazol-3-one, 1,3-dimethyl-1H-pyrazol-5(4H)-one, 1,3-Dimethylpyrazol-5-one, 1,3-dimethyl-5-pyrazolinone, NSC 304, EINECS 220-389-2, MFCD00067008
1,3-Dimethyl-5-pyrazolone (CAS 2749-59-9) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C5H8N2O and a molecular weight of 112.130 g/mol. Key properties include a melting point of 117°C, a boiling point of 151.7±23.0 °C at 760 mmHg, a density of 1.2±0.1 g/cm3 and a flash point of 45.5±22.6 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 2749-59-9
- Jingsj CID
- J-45182-0
- Molecular Formula
- C5H8N2O
- Molecular Weight
- 112.130 g/mol
- Category
- Pharma Intermediates
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 117°C |
|---|---|
| Boiling Point | 151.7±23.0 °C at 760 mmHg |
| Density | 1.2±0.1 g/cm3 |
| Flash Point | 45.5±22.6 °C |
| Exact Mass | 112.063660 |
| PSA | 32.67000 |
| LogP | -0.44 |
| Vapor Pressure | 3.6±0.3 mmHg at 25°C |
| Refractive Index | 1.554 |
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 1,3-Dimethyl-5-pyrazolone?
The CAS number of 1,3-Dimethyl-5-pyrazolone is 2749-59-9.
What are the molecular formula and molecular weight of 1,3-Dimethyl-5-pyrazolone?
1,3-Dimethyl-5-pyrazolone has molecular formula C5H8N2O and molecular weight 112.130 g/mol.
What are the upstream and downstream products of 1,3-Dimethyl-5-pyrazolone?
For 1,3-Dimethyl-5-pyrazolone, Upstream Products: Ethyl acetoacetate, Methylhydrazine sulfate, Ethyl (2Z)-3-(pyrrolidin-1-yl)but-2-enoate; Downstream Products: 5-(4-chlorophenoxy)-1,3-dimethyl-1H-pyrazole-4-carbaldehyde, 5-Chloro-1,3-dimethyl-1H-pyrazole-4-carbonyl chloride, 5-Chloro-1,3-dimethyl-1H-pyrazole-4-carboxaldehyde.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "1,3-Dimethyl-5-pyrazolone (CAS 2749-59-9)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-45182-0 (accessed 2026-11-07).
Data for reference only; verify product details with suppliers before purchase.