3-Phenylisoxazol-5-yl 3-(2-chlorophenyl)-5-methylisoxazole-4-carboxylate CAS 303987-03-3
| CAS No. | 303987-03-3 |
| Molecular Formula | C20H13ClN2O4 |
| Molecular Weight | 380.78 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
3-Phenylisoxazol-5-yl 3-(2-chlorophenyl)-5-methylisoxazole-4-carboxylate (CAS 303987-03-3) is a high-purity analytical reference standard with the molecular formula C20H13ClN2O4 and a molecular weight of 380.78 g/mol.
Based on its molecular formula C20H13ClN2O4, 3-Phenylisoxazol-5-yl 3-(2-chlorophenyl)-5-methylisoxazole-4-carboxylate contains a flavonoid core, an amide group, a hydroxyl group, an ether linkage, chlorine substitution; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 380.78 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. Halogen substitution (F/Cl/Br/I) produces a distinctive isotope pattern in mass spectrometry, a valuable aid for qualitative confirmation.
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.
As a certified reference material (CRM), 3-Phenylisoxazol-5-yl 3-(2-chlorophenyl)-5-methylisoxazole-4-carboxylate meets the metrological traceability requirements of ISO/IEC 17025 laboratories. Batch-to-batch consistency is monitored via control charts to guarantee comparable assigned values across lots.
Physical & Chemical Properties
| Molecular Formula | C20H13ClN2O4 |
| Molecular Weight | 380.78 g/mol |
| Appearance | Pale yellow to yellow crystalline powder. (slight halide-like odor) |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in DMSO, DMF, methanol |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 15.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 2025 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 2 |
Related Phenylisoxazol Standards
- 3-((2-Oxo-2-(3-phenylisoxazol-5-yl)ethyl)thio)-4-(pyridin-3-yl)-1H-1,2,4-triazol-5(4H)-one (CAS 712270-97-8)
- 1-(3-Phenylisoxazol-5-yl)-2-((3-(trifluoromethyl)benzyl)thio)ethan-1-one (CAS 478066-86-3)
- 3-Phenylisoxazol-5-yl 2,4-dichlorobenzenesulfonate (CAS 320423-37-8)
- 2-((2-(5-Phenylisoxazol-3-yl)phenoxy)methyl)-4H-chromen-4-one (CAS 96440-20-9)
- (5-Phenylisoxazol-3-yl)(4-(pyrazin-2-yloxy)piperidin-1-yl)methanone (CAS 1448046-54-5)
- (5-Phenylisoxazol-3-yl)methyl 3,4-dichlorobenzoate (CAS 343374-57-2)
- (5-Phenylisoxazol-3-yl)methyl 3-(trifluoromethyl)benzoate (CAS 343374-56-1)
- (5-Phenylisoxazol-3-yl)(4-(thiophen-3-yl)piperidin-1-yl)methanone (CAS 1396799-01-1)
Recommended Standards
- 3-((4-Chlorophenyl)thio)-1-(4-fluoro-3-nitrophenyl)pyrrolidine-2,5-dione (CAS 882749-44-2)
- 7-Chloro-4-nitro-1-(p-tolyloxy)acridin-9(10H)-one (CAS 61290-20-8)
- 2-Chloro-1,5-dihydroxy-6-(4-methoxyphenyl)anthracene-9,10-dione (CAS 92753-68-9)
- Naled (CAS 300-76-5)
- t-Butyl N-(3-methanesulfonylphenyl)carbamate (CAS 27979-92-6)
- Triadimenol (CAS 55219-65-3)
- 4-(2-Chlorophenyl)thiazole-2-carbaldehyde (CAS 383142-61-8)
- 1,4-Bis(methoxycarbonyl)cubane (CAS 29412-62-2)
- (11bR)-N-[(R)-1-Phenylethyl]-dinaphtho[2,1-d:1',2'-f][1,3,2]dioxaphosphepin-4-amine (CAS 934705-43-8)
- 1-(3,5-Dichloropyridin-2-yl)thiourea (CAS 31545-32-1)
- n-(4-Bromobenzyl)-1-(pyridin-2-yl)methanamine dihydrochloride (CAS 1211183-86-6)
- (2-Chloroacetyl)-L-Glutamic Acid TFA (CAS 56576-86-4(free base))
- 2,4-Dioxo-7-(propan-2-yl)-1-propyl-1h,2h,3h,4h-pyrido[2,3-d]pyrimidine-5-carboxylic acid (CAS 1000932-57-9)
- Liraglutide Impurity 21 TFA Salt (CAS CATO-C4X-199221)
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