3-Isoxazolecarboxylic acid

Also known as: Isoxazole-3-carboxylic acid, 1,2-Oxazole-3-carboxylic acid, 3-Carboxyisoxazole, AKOS PAO-1373, isoxazole-3-carboxylic acid

3-Isoxazolecarboxylic acid (CAS 3209-71-0) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C4H3NO3 and a molecular weight of 113.072 g/mol. Key properties include a melting point of 147-153°C, a boiling point of 321.2±15.0 °C at 760 mmHg, a density of 1.5±0.1 g/cm3 and a flash point of 148.1±20.4 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 3209-71-0
Jingsj CID: J-1393933-8
Molecular Formula: C₄H₃NO₃
Molecular Weight: 113.072 g/mol
Category: Organic Acids
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	147-153°C
Boiling Point	321.2±15.0 °C at 760 mmHg
Density	1.5±0.1 g/cm3
Flash Point	148.1±20.4 °C
Exact Mass	113.011292
PSA	63.33000
LogP	0.22
Vapor Pressure	0.0±0.7 mmHg at 25°C
Refractive Index	1.517
Storage Conditions	2-8°C

Customs & Trade Information

HS Code	2934999090
Summary	2934999090. other heterocyclic compounds. 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 3-Isoxazolecarboxylic acid?

The CAS number of 3-Isoxazolecarboxylic acid is 3209-71-0.

What are the molecular formula and molecular weight of 3-Isoxazolecarboxylic acid?

3-Isoxazolecarboxylic acid has molecular formula C4H3NO3 and molecular weight 113.072 g/mol.

Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.

Last updated: 8/21/2026

How to cite: Jingsj. "3-Isoxazolecarboxylic acid (CAS 3209-71-0)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1393933-8 (accessed 2026-11-09).

Data for reference only; verify product details with suppliers before purchase.