3-Phenylisoxazole-4-carboxylic acid CAS 18718-84-8
| CAS No. | 18718-84-8 |
| Molecular Formula | C10H7NO3 |
| Molecular Weight | 189.17 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
The occurrence of 3-Phenylisoxazole-4-carboxylic acid is closely related to an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage in its molecular formula, which determines its behaviour during synthesis, purification, or degradation.
3-Phenylisoxazole-4-carboxylic acid (CAS 18718-84-8), molecular formula C10H7NO3 and molecular weight 189.17 g/mol, is a CATO reference standard with documented purity and traceability.
Based on its molecular formula C10H7NO3, 3-Phenylisoxazole-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 189.17 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.
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 3-Phenylisoxazole-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 | C10H7NO3 |
| Molecular Weight | 189.17 g/mol |
| Appearance | Pale yellow to 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) | 8.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1962 |
| Nitrogen Atoms | 1 |
Related Phenylisoxazole Standards
- 3-Phenylisoxazole-5-carboxylic acid (CAS 14442-12-7)
- 4-Phenylisoxazole-5-carboxylic acid (CAS 858490-03-6)
- 5-Phenylisoxazole-4-carboxylic Acid (CAS 76344-95-1)
- 3-Phenylisoxazole-5-carboxamide (CAS 400870-91-9)
- 5-Phenylisoxazole-3-carboxamide (CAS 23088-52-0)
- 3-Methyl-5-phenylisoxazole-4-carbaldehyde (CAS 89479-66-3)
- 5-Methyl-3-phenylisoxazole-4-carbonitrile (CAS 24400-67-7)
- 59985-82-9 5-phenylisoxazole-3-carbaldehyde DTXSID50428295 (CAS 59985-82-9)
Recommended Standards
- 2-Oxo-2h-chromene-3-carboxamide (CAS 1846-78-2)
- N-Acetyl-D-glutamic Acid (CAS 19146-55-5)
- 3-(2-nitroethenyl)-1H-pyrrolo[2,3-b]pyridine (CAS 183208-28-8)
- 3-Nitro-1-naphthalenol, 97% (CAS 19256-80-5)
- n-Octylbenzene (CAS 2189-60-8)
- 4,5-Difluorothiophene-2-sulfonyl chloride (CAS 2657625-63-1)
- n-(1-(1h-Pyrazol-1-yl)propan-2-yl)-5-bromofuran-2-carboxamide (CAS 1170023-15-0)
- (3S,7R,8aS)-3-benzyl-7-hydroxyhexahydropyrrolo[1,2-a]pyrazine-1,4-dione 118477-06-8 (CAS 118477-06-8)
- 1-(4h-1,2,4-Triazol-3-yl)ethan-1-ol (CAS 1500489-89-3)
- (3|A,5|A,17|A)-19-Norpregnane-3,17-diol 17|A-Ethyl-5|A-estrane-3|A,17|A-diol 19-Nor-5|A,17|A-pregnane-3|A,17-diol 31658-51-2 (CAS 31658-51-2)
- 2-(3-Methoxypropoxy)-5-methylaniline (CAS 946728-29-6)
- N-(Butan-2-yl)-1-(6-methylpyridin-2-yl)-1H-imidazole-4-carboxamide (CAS 477871-86-6)
- Ethyl 2-bromo-4-cyano-5-methylbenzoate (CAS 1805487-55-1)
- Semaglutide Impurity 21(HO-Ste-L-γGlu-AEEA-AEEA-OH) (CAS 1335440-44-2)
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