5-(4-methylphenyl)isoxazole-3-carboxylic acid

Also known as: 5-(p-tolyl)isoxazole-3-carboxylic acid, 5-(4-methylphenyl)-1,2-oxazole-3-carboxylic acid, 3-Isoxazolecarboxylic acid, 5-(4-methylphenyl)-, 5-p-Tolyl-isoxazole-3-carboxylic acid, MFCD04969583

5-(4-methylphenyl)isoxazole-3-carboxylic acid (CAS 33282-21-2) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C11H9NO3 and a molecular weight of 203.19400 g/mol. Key properties include a melting point of 184ºC (dec.)(lit.), a boiling point of 433.5ºC at 760 mmHg, a density of 1.273g/cm3 and a flash point of 216ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 33282-21-2
Jingsj CID: J-26342-3
Molecular Formula: C₁₁H₉NO₃
Molecular Weight: 203.19400 g/mol
Category: Organic Acids
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	184ºC (dec.)(lit.)
Boiling Point	433.5ºC at 760 mmHg
Density	1.273g/cm3
Flash Point	216ºC
Exact Mass	203.05800
PSA	63.33000
LogP	2.34820
Refractive Index	1.578

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 5-(4-methylphenyl)isoxazole-3-carboxylic acid?

The CAS number of 5-(4-methylphenyl)isoxazole-3-carboxylic acid is 33282-21-2.

What are the molecular formula and molecular weight of 5-(4-methylphenyl)isoxazole-3-carboxylic acid?

5-(4-methylphenyl)isoxazole-3-carboxylic acid has molecular formula C11H9NO3 and molecular weight 203.19400 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. "5-(4-methylphenyl)isoxazole-3-carboxylic acid (CAS 33282-21-2)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-26342-3 (accessed 2026-11-09).

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