3,4-Dimethyl-5-pyrazolone
3,4-二甲基-5-吡唑啉酮
Also known as: 3,4-Dimethyl-4,5-dihydro-1H-pyrazol-5-one, 4,5-Dimethyl-3H-pyrazol-3-one, 2,4-Dihydro-4,5-dimethyl-3H-pyrazol-3-one, 3,4-Dimethyl-2-pyrazolin-5-one, 3,4-Dimethyl-1,4-dihydropyrazol-5-one, 3,4-Dimethylpyrazolin-5-one, 4,5-Dimethyl-1,2-dihydro-pyrazol-3-one
3,4-Dimethyl-5-pyrazolone (CAS 6628-22-4) 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 112.13000 g/mol. It is also known as 3,4-Dimethyl-4,5-dihydro-1H-pyrazol-5-one, 4,5-Dimethyl-3H-pyrazol-3-one and 2,4-Dihydro-4,5-dimethyl-3H-pyrazol-3-one. Key properties include a melting point of 269-271ºC, a boiling point of 307.5ºC at 760 mmHg, a density of 1.25g/cm3 and a flash point of 139.7ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 6628-22-4
- Jingsj CID
- J-1442037-1
- Molecular Formula
- C5H8N2O
- Chinese Name
- 3,4-二甲基-5-吡唑啉酮
- Molecular Weight
- 112.13000 g/mol
- Category
- Pharma Intermediates
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 269-271ºC |
|---|---|
| Boiling Point | 307.5ºC at 760 mmHg |
| Density | 1.25g/cm3 |
| Flash Point | 139.7ºC |
Frequently Asked Questions
What is the CAS number of 3,4-Dimethyl-5-pyrazolone?
The CAS number of 3,4-Dimethyl-5-pyrazolone is 6628-22-4.
What are the molecular formula and molecular weight of 3,4-Dimethyl-5-pyrazolone?
3,4-Dimethyl-5-pyrazolone has molecular formula C5H8N2O and molecular weight 112.13000 g/mol.
Data compiled from public chemical databases and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "3,4-Dimethyl-5-pyrazolone (CAS 6628-22-4)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1442037-1 (accessed 2026-10-22).
Data for reference only; verify specifications, grades and regulatory status with suppliers before purchase.