2,1-Benzisoxazole-3-carboxylic acid
Also known as: Benzo[c]isoxazole-3-carboxylic acid, Anthroxanic acid, 2,1-Benzoxazole-3-carboxylic acid, 3-Carboxy-2,1-benzisoxazole, AKOS BC-0831, 2,1-Benzisoxazol-3-carboxylsaeure, Anthroxansaeure, F2167-0177
2,1-Benzisoxazole-3-carboxylic acid (CAS 642-91-1) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C8H5NO3 and a molecular weight of 163.130 g/mol. Key properties include a melting point of 185ºC, a boiling point of 387.3±15.0 °C at 760 mmHg, a density of 1.5±0.1 g/cm3 and a flash point of 188.0±20.4 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 642-91-1
- Jingsj CID
- J-31413-6
- Molecular Formula
- C8H5NO3
- Molecular Weight
- 163.130 g/mol
- Category
- Organic Acids
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 185ºC |
|---|---|
| Boiling Point | 387.3±15.0 °C at 760 mmHg |
| Density | 1.5±0.1 g/cm3 |
| Flash Point | 188.0±20.4 °C |
| Exact Mass | 163.026947 |
| PSA | 63.33000 |
| LogP | 1.20 |
| Vapor Pressure | 0.0±0.9 mmHg at 25°C |
| Refractive Index | 1.661 |
| 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 2,1-Benzisoxazole-3-carboxylic acid?
The CAS number of 2,1-Benzisoxazole-3-carboxylic acid is 642-91-1.
What are the molecular formula and molecular weight of 2,1-Benzisoxazole-3-carboxylic acid?
2,1-Benzisoxazole-3-carboxylic acid has molecular formula C8H5NO3 and molecular weight 163.130 g/mol.
What are the upstream and downstream products of 2,1-Benzisoxazole-3-carboxylic acid?
For 2,1-Benzisoxazole-3-carboxylic acid, Upstream Products: 2-Nitrobenzaldehyde, 2-(2-Aminophenyl)-2-oxoacetic acid, 2-Nitrobenzoyl chloride; Downstream Products: isatin, Benzo[c]isoxazole-3-carbonyl chloride.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "2,1-Benzisoxazole-3-carboxylic acid (CAS 642-91-1)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-31413-6 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.