1-(3-Chlorophenyl)-3-methyl-5-pyrazolone
Also known as: 1-(3-Chlorophenyl)-3-methyl-2-pyrazolin-5-one, 2-(3-chlorophenyl)-2,4-dihydro-5-methyl-3H-pyrazol-3-one, 3-methyl-1-(3-chlorophenyl)-2-pyrazolin-5-one, MCPMP, m-Chloropyrazolone, 1-(3-Chlorophenyl)-4,5-dihydro-3-methyl-1H-pyrazol-5-one, 2-(3-chlorophenyl)-5-methyl-4H-pyrazol-3-one
1-(3-Chlorophenyl)-3-methyl-5-pyrazolone (CAS 90-31-3) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C10H9ClN2O and a molecular weight of 208.64400 g/mol. Key properties include a melting point of 128-131ºC, a boiling point of 382.9ºC at 760 mmHg, a density of 1.32g/cm3 and a flash point of 185.4ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 90-31-3
- Jingsj CID
- J-37202-1
- Molecular Formula
- C10H9ClN2O
- Molecular Weight
- 208.64400 g/mol
- Category
- Pharma Intermediates
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 128-131ºC |
|---|---|
| Boiling Point | 382.9ºC at 760 mmHg |
| Density | 1.32g/cm3 |
| Flash Point | 185.4ºC |
| Exact Mass | 208.04000 |
| PSA | 32.67000 |
| LogP | 1.95320 |
| Refractive Index | 1.625 |
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-Chlorophenyl)-3-methyl-5-pyrazolone?
The CAS number of 1-(3-Chlorophenyl)-3-methyl-5-pyrazolone is 90-31-3.
What are the molecular formula and molecular weight of 1-(3-Chlorophenyl)-3-methyl-5-pyrazolone?
1-(3-Chlorophenyl)-3-methyl-5-pyrazolone has molecular formula C10H9ClN2O and molecular weight 208.64400 g/mol.
What are the upstream and downstream products of 1-(3-Chlorophenyl)-3-methyl-5-pyrazolone?
For 1-(3-Chlorophenyl)-3-methyl-5-pyrazolone, Upstream Products: 3-Chlorophenylhydrazine hydrochloride, Ethyl acetoacetate, (3-Chlorophenyl)hydrazine.
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-Chlorophenyl)-3-methyl-5-pyrazolone (CAS 90-31-3)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-37202-1 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.