5-Isobutyl-3-methylisoxazole-4-carboxylic acid CAS 90643-65-5
| CAS No. | 90643-65-5 |
| Molecular Formula | C9H13NO3 |
| Molecular Weight | 183.20 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
CATO supplies 5-Isobutyl-3-methylisoxazole-4-carboxylic acid (CAS 90643-65-5), a certified reference material (molecular formula C9H13NO3, MW 183.20 g/mol) for analytical method development and quality control.
Based on its molecular formula C9H13NO3, 5-Isobutyl-3-methylisoxazole-4-carboxylic acid contains an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 183.20 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
This reference standard is suitable for quantitative analysis on major chromatographic platforms including HPLC, GC, LC-MS/MS, and GC-MS, serving as an external calibration standard or a system suitability test reference material.
CATO manufactures 5-Isobutyl-3-methylisoxazole-4-carboxylic acid under ISO 17034:2016 accreditation with dual CNAS and ANAB accreditation. Each batch is characterized by orthogonal methods and supplied with a full Certificate of Analysis (COA), ensuring metrological traceability.
Physical & Chemical Properties
| Molecular Formula | C9H13NO3 |
| Molecular Weight | 183.20 g/mol |
| Appearance | Off-white to pale yellow crystalline powder. (faint amine-like odor) |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 4.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1982 |
| Nitrogen Atoms | 1 |
Related Isobutyl Standards
- 5-(2-Isobutyl)-4-amino-1H-pyrazole-3-carboxylic acid (CAS 1093415-88-3)
- 1-Isobutyl-5-methyl-1h-1,2,3-triazole-4-carboxylic acid (CAS 1267130-39-1)
- 1-Isobutyl-5-methyl-3-nitro-1H-pyrazole (CAS 1429418-19-8)
- 1-Isobutyl-3-methyl-5-nitro-1h-pyrazole (CAS 1429418-84-7)
- n-Isobutyl-3-isopropyl-1,2,4-oxadiazol-5-amine (CAS 1249792-53-7)
- N-[(5-Isobutyl-1,2,4-oxadiazol-3-yl)methyl]-ethanamine (CAS 915925-33-6)
- n-Isobutyl-3,3-dimethylcyclohexan-1-amine (CAS 1342687-11-9)
- n-Isobutyl-4,4-dimethylcyclohexan-1-amine (CAS 1343812-60-1)
Recommended Standards
- 5,8-Difluoro-1,2,3,4-tetrahydronaphthalen-1-amine (CAS 907973-51-7)
- 5-Pentylisoxazole-3-carboxylic acid (CAS 89967-39-5)
- 5,7-Difluoro-1,2,3,4-tetrahydronaphthalen-1-amine (CAS 907973-46-0)
- 5-Pentyloxazole-4-carboxylic acid (CAS 89007-03-4)
- N-(2,5-Dichlorophenyl)-2-methoxybenzamide (CAS 409348-29-4)
- 1-Methyl-2-(2-methylcyclohexyl)benzene (CAS 92299-07-5)
- 3-(2-Aminooxazol-5-yl)benzonitrile (CAS 1935490-27-9)
- 6-Bromohexyltriethylammonium Bromide (CAS 161097-76-3)
- 2-Methoxy-5-methylbenzoyl chloride (CAS 25045-35-6)
- 5-Amino-2-bromo-4-fluorobenzenesulfonamide (CAS 1474095-68-5)
- 2-((4,6-Dimethylquinolin-2-yl)thio)acetic acid (CAS 370848-09-2)
- (S)-Laudanine (CAS 3122-95-0)
- Methyl 2-[(fluorosulfonyl)methyl]benzoate (CAS 1354953-70-0)
- Semaglutide impurity 250 (CAS CATO-C4X-2226250)
Why CATO?
- ISO 17034 accredited reference material producer (CNAS + ANAB dual accreditation)
- 130,000+ catalog items in stock, COA supplied with every batch
- Worldwide shipping with full export documentation (HS code guidance available)
- Technical support: +86 18665070610 / Nicole.chen@cato-chem.com