5-Methyl-4-isoxazolecarboxylic acid

CAS NO.：42831-50-5
Empirical Formula: C5H5NO3
Molecular Weight: 127.1
MDL number: MFCD00955655
EINECS: 700-400-1
SAFETY DATA SHEET (SDS)
Update Date: 2025-02-25 20:54:18

What is 5-Methyl-4-isoxazolecarboxylic acid?

Chemical properties

Cream to brown Solid

The Uses of 5-Methyl-4-isoxazolecarboxylic acid

An intermediate for synthesis of Leflunomide (L322750). Herbicidal activities towards Digitaria ciliaris

The Uses of 5-Methyl-4-isoxazolecarboxylic acid

5-Methylisoxazole-4-carboxylic Acid (Leflunomide EP Impurity D) is an intermediate for synthesis of Leflunomide (L322750). Herbicidal activities towards Digitaria ciliaris.

Flammability and Explosibility

Non flammable

Properties of 5-Methyl-4-isoxazolecarboxylic acid

Melting point:	144-148 °C(lit.)
Boiling point:	308.3±22.0 °C(Predicted)
Density	1.348±0.06 g/cm3(Predicted)
storage temp.	Sealed in dry,Room Temperature
solubility	DMSO (Slightly), Methanol (Slightly)
form	Solid
pka	2.85±0.25(Predicted)
color	White to Pale Brown
BRN	116000
CAS DataBase Reference	42831-50-5(CAS DataBase Reference)

Safety information for 5-Methyl-4-isoxazolecarboxylic acid

Signal word	Warning
Pictogram(s)	Exclamation Mark Irritant GHS07
GHS Hazard Statements	H315:Skin corrosion/irritation H319:Serious eye damage/eye irritation H335:Specific target organ toxicity, single exposure;Respiratory tract irritation
Precautionary Statement Codes	P261:Avoid breathing dust/fume/gas/mist/vapours/spray. P304+P340:IF INHALED: Remove victim to fresh air and Keep at rest in a position comfortable for breathing. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. P405:Store locked up.