1H-Pyrazole-3-carboxylic acid
Also known as: 3-Carboxy-1H-pyrazole, Pyrazole-3-carboxylic acid, 1H-Pyrazole-3-carboxylic acid, 3-Pyrazolecarboxylic acid, 5-Pyrazolecarboxylic acid, MFCD00077436
1H-Pyrazole-3-carboxylic acid (CAS 1621-91-6) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C4H4N2O2 and a molecular weight of 112.09 g/mol. Key properties include a melting point of 211ºC, a boiling point of 417.1±18.0 °C at 760 mmHg, a density of 1.5±0.1 g/cm3 and a flash point of 206.1±21.2 °C. It is classified under GHS with signal word Warning and hazard statements H315 — Causes skin irritation. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 1621-91-6
- Jingsj CID
- J-21606-8
- Molecular Formula
- C4H4N2O2
- Molecular Weight
- 112.09 g/mol
- Category
- Pharma Intermediates
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 211ºC |
|---|---|
| Boiling Point | 417.1±18.0 °C at 760 mmHg |
| Density | 1.5±0.1 g/cm3 |
| Flash Point | 206.1±21.2 °C |
| Exact Mass | 112.027275 |
| PSA | 65.98000 |
| LogP | -0.21 |
| Vapor Pressure | 0.0±1.0 mmHg at 25°C |
| Refractive Index | 1.617 |
GHS Safety & Compliance
- H315 — Causes skin irritation
Frequently Asked Questions
What is the CAS number of 1H-Pyrazole-3-carboxylic acid?
The CAS number of 1H-Pyrazole-3-carboxylic acid is 1621-91-6.
What are the molecular formula and molecular weight of 1H-Pyrazole-3-carboxylic acid?
1H-Pyrazole-3-carboxylic acid has molecular formula C4H4N2O2 and molecular weight 112.09 g/mol.
Is 1H-Pyrazole-3-carboxylic acid hazardous?
1H-Pyrazole-3-carboxylic acid has GHS signal word Warning and hazard statements H315 — Causes skin irritation.
What are the upstream and downstream products of 1H-Pyrazole-3-carboxylic acid?
For 1H-Pyrazole-3-carboxylic acid, Upstream Products: 3-Methylpyrazole, Ethyl 1H-pyrazole-3-carboxylate, 3-(Trifluoromethyl)-1H-pyrazole; Downstream Products: Ethyl 1H-pyrazole-3-carboxylate, Ethyl 1H-pyrazole-3-carboxylate, Pyrazole.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "1H-Pyrazole-3-carboxylic acid (CAS 1621-91-6)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-21606-8 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.