5-Methylisoxazole-4-carboxylic acid, 97%

Name: 5-Methylisoxazole-4-carboxylic acid, 97%
Brand: Vaqora Chemicals
SKU: VQ-012675

About 5-Methylisoxazole-4-carboxylic acid, 97%

5-Methylisoxazole-4-carboxylic acid (CAS 42831-50-5) is a heterocyclic building block offered by Vaqora Chemicals with a typical assay of 97%. Formula C5H5NO3, molecular weight 127.1 g/mol. The IUPAC name is 5-methyl-1,2-oxazole-4-carboxylic acid. Alternative names: 4-Isoxazolecarboxylic acid, 5-methyl- and 5-Methyl-4-isoxazolecarboxylic acid.

It is supplied as white to light yellow powder or crystals. Reported physical data include a melting point of 145.0 to 149.0 °C. Store in a tightly closed container in a cool, dry and well-ventilated place. Under GHS it is labelled “Danger”, so handle it with suitable PPE and consult the SDS.

Key uses span organic synthesis and API synthesis. Buyers come mainly from pharmaceutical manufacturing and academic and industrial research.

Available in 5 g and 25 g packs, 5-Methylisoxazole-4-carboxylic acid is dispatched with a Certificate of Analysis (COA) to destinations worldwide.

Typical applications

Organic synthesis
API synthesis

Industries

Specifications & identifiers

Chemical identifiers
Product name	5-Methylisoxazole-4-carboxylic acid, 97%
Catalogue No.	VQ-012675
CAS Number	42831-50-5
IUPAC name	5-methyl-1,2-oxazole-4-carboxylic acid
Molecular formula	C₅H₅NO₃
Molecular weight	127.1 g/mol
Exact mass	127.0269
Purity / assay	97%
HSN code	29420090
InChIKey	VQBXUKGMJCPBMF-UHFFFAOYSA-N
SMILES	CC1=C(C=NO1)C(=O)O
PubChem CID	1425240

Physical properties
Physical form	Crystalline
Appearance	White to light yellow powder or crystals
Melting point	145.0 to 149.0 °C
LogP (XLogP3)	0.3
H-bond donors / acceptors	1 / 4
TPSA	63.3 Å²
Synonyms	4-Isoxazolecarboxylic acid, 5-methyl-, 5-Methyl-4-isoxazolecarboxylic acid, 5-Methylisoxazole-4-carboxylicacid, 5-Methylisoxazole-4-carboxylic acid, 97%, 5-methyl-isoxazole-4-carboxylic acid, 5-Methylisoxazol-4-yl carboxylic acid, 5-methyl-1,2-oxazole -4-carboxylic acid

Safety & hazard information (GHS)

Corrosive

Harmful / irritant

Signal word: Danger

Hazard statements

H302Harmful if swallowed
H315Causes skin irritation
H318Causes serious eye damage
H319Causes serious eye irritation
H335May cause respiratory irritation

Precautionary statements: P261, P264, P264 + P265, P270, P271, P280, P301 + P317, P302 + P352, P304 + P340, P305 + P351 + P338, P305 + P354 + P338, P317, P319, P321, P330, P332 + P317, P337 + P317, P362 + P364, P403 + P233, P405, P501

Classification is indicative (aggregated GHS notifications) and may vary by grade and concentration. Always refer to the SDS supplied with your lot.

Documents

Safety Data Sheet (SDS)16-section GHS · on request Certificate of AnalysisTypical / batch COA · on request Specification sheetTDS / MOA · on request

Frequently asked questions

What is the CAS number of 5-Methylisoxazole-4-carboxylic acid, 97%?

The CAS Registry Number of 5-Methylisoxazole-4-carboxylic acid, 97% is 42831-50-5. It is also known as 4-Isoxazolecarboxylic acid, 5-methyl-, 5-Methyl-4-isoxazolecarboxylic acid, 5-Methylisoxazole-4-carboxylicacid.

What is the molecular formula and molecular weight of 5-Methylisoxazole-4-carboxylic acid, 97%?

5-Methylisoxazole-4-carboxylic acid, 97% has the molecular formula C5H5NO3 and a molecular weight of 127.1 g/mol. Its IUPAC name is 5-methyl-1,2-oxazole-4-carboxylic acid.

Which grade and pack sizes of 5-Methylisoxazole-4-carboxylic acid, 97% can I order?

We supply 5-Methylisoxazole-4-carboxylic acid, 97% in (97%) grade, in 5 g, 25 g packs. Larger bulk quantities and custom packing are quoted on request.

Do you provide a COA and SDS with 5-Methylisoxazole-4-carboxylic acid, 97%?

Yes. Every lot of 5-Methylisoxazole-4-carboxylic acid, 97% is shipped with a batch-specific Certificate of Analysis, and a 16-section GHS Safety Data Sheet is provided with the quotation and the shipment.

Can 5-Methylisoxazole-4-carboxylic acid, 97% be shipped internationally?

Yes. 5-Methylisoxazole-4-carboxylic acid, 97% is classified as hazardous, so it is packed in UN-approved packaging and shipped as dangerous goods under IATA/IMDG rules. We export worldwide on EXW, FOB, CIF and DAP terms.