4-Amino-1H-pyrazole
Also known as: 1H-pyrazol-4-amine, 4-aminopyrazole, 1H-pyrazole-4-amine, 4-NH2-pyrazole
4-Amino-1H-pyrazole (CAS 28466-26-4) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C3H5N3 and a molecular weight of 83.092 g/mol. Key properties include a melting point of 75-77ºC, a boiling point of 334.5±15.0 °C at 760 mmHg, a density of 1.3±0.1 g/cm3 and a flash point of 182.6±7.6 °C. It is classified under GHS with signal word Warning and hazard statements H302 — Harmful if swallowed, H315 — Causes skin irritation and H319 — Causes serious eye irritation. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 28466-26-4
- Jingsj CID
- J-3595-0
- Molecular Formula
- C3H5N3
- Molecular Weight
- 83.092 g/mol
- Category
- Pharma Intermediates
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 75-77ºC |
|---|---|
| Boiling Point | 334.5±15.0 °C at 760 mmHg |
| Density | 1.3±0.1 g/cm3 |
| Flash Point | 182.6±7.6 °C |
| Exact Mass | 83.048347 |
| PSA | 54.70000 |
| LogP | -1.10 |
| Vapor Pressure | 0.0±0.7 mmHg at 25°C |
| Refractive Index | 1.648 |
GHS Safety & Compliance
- H302 — Harmful if swallowed
- H315 — Causes skin irritation
- H319 — Causes serious eye irritation
- H335 — May cause respiratory irritation
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 4-Amino-1H-pyrazole?
The CAS number of 4-Amino-1H-pyrazole is 28466-26-4.
What are the molecular formula and molecular weight of 4-Amino-1H-pyrazole?
4-Amino-1H-pyrazole has molecular formula C3H5N3 and molecular weight 83.092 g/mol.
Is 4-Amino-1H-pyrazole hazardous?
4-Amino-1H-pyrazole has GHS signal word Warning and hazard statements H302 — Harmful if swallowed; H315 — Causes skin irritation; H319 — Causes serious eye irritation.
What are the upstream and downstream products of 4-Amino-1H-pyrazole?
For 4-Amino-1H-pyrazole, Upstream Products: 4-Nitro-1H-pyrazole, 4-Amino-1H-pyrazole-3-carboxylic acid, acetic acid; Downstream Products: 4-Iodopyrazole, 2,4-Dichloro-6-methylnicotinaldehyde.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "4-Amino-1H-pyrazole (CAS 28466-26-4)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-3595-0 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.