5-Amino-1H-pyrazol-3(2H)-one
5-氨基-1H-吡唑-3-酮
Also known as: 3-Amino-3-pyrazolin-5-one, 5-Amino-1,2-dihydro-3H-pyrazol-3-one, 3-Amino-1,2-dihydropyrazol-5-one, 5-Amino-3-hydroxy-1H-pyrazole, 3-Amino-1H-pyrazol-5-ol, 5-Aminopyrazol-3-ol, 5-Amino-3-pyrazolone, 3H-Pyrazol-3-one,5-amino-1,2-dihydro-
5-Amino-1H-pyrazol-3(2H)-one (CAS 28491-52-3) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C3H5N3O and a molecular weight of 99.091 g/mol. It is also known as 3-Amino-3-pyrazolin-5-one, 5-Amino-1,2-dihydro-3H-pyrazol-3-one and 3-Amino-1,2-dihydropyrazol-5-one. Key properties include a melting point of 204°C, a boiling point of 479.5±25.0 °C at 760 mmHg, a density of 1.6±0.1 g/cm3 and a flash point of 243.8±23.2 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 28491-52-3
- Jingsj CID
- J-1526548-1
- Molecular Formula
- C3H5N3O
- Chinese Name
- 5-氨基-1H-吡唑-3-酮
- Molecular Weight
- 99.091 g/mol
- Category
- Pharma Intermediates
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 204°C |
|---|---|
| Boiling Point | 479.5±25.0 °C at 760 mmHg |
| Density | 1.6±0.1 g/cm3 |
| Flash Point | 243.8±23.2 °C |
Frequently Asked Questions
What is the CAS number of 5-Amino-1H-pyrazol-3(2H)-one?
The CAS number of 5-Amino-1H-pyrazol-3(2H)-one is 28491-52-3.
What are the molecular formula and molecular weight of 5-Amino-1H-pyrazol-3(2H)-one?
5-Amino-1H-pyrazol-3(2H)-one has molecular formula C3H5N3O and molecular weight 99.091 g/mol.
Data compiled from public chemical databases and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "5-Amino-1H-pyrazol-3(2H)-one (CAS 28491-52-3)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1526548-1 (accessed 2026-10-25).
Data for reference only; verify specifications, grades and regulatory status with suppliers before purchase.