5-(2-Furyl)isoxazole CAS 138716-33-3
| CAS No. | 138716-33-3 |
| Molecular Formula | C7H5NO2 |
| Molecular Weight | 135.12 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
5-(2-Furyl)isoxazole (CAS 138716-33-3) is a high-purity analytical reference standard with the molecular formula C7H5NO2 and a molecular weight of 135.12 g/mol.
The molecular framework of 5-(2-Furyl)isoxazole (C7H5NO2) is characterized by an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage. In reversed-phase chromatography, its retention is governed primarily by the protonation state of its nitrogen-containing groups, which provides a practical basis for HPLC-UV/DAD or LC-MS method development. The presence of an aromatic ring or conjugated system gives the compound characteristic absorption bands in the UV-Vis region, making it well suited to UV or diode-array detection (DAD).
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.
The assigned purity is verified by mass-balance and quantitative NMR (qNMR) approaches, with the expanded uncertainty reported at a 95% confidence level (k=2). Batch homogeneity and stability are independently assessed for every lot.
Physical & Chemical Properties
| Molecular Formula | C7H5NO2 |
| Molecular Weight | 135.12 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light |
| Solubility (reference) | Soluble in methanol, acetonitrile, DMSO, water (slightly soluble) |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 6.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1996 |
| Nitrogen Atoms | 1 |
Related Furyl Standards
- 3-(2-Furyl)-1H-1,2,4-triazole (CAS 23195-65-5)
- 1-(2-Furyl)-trans-1-buten-3-one (CAS 196951-16-3)
- (E)-4-(2-Furyl)-3-buten-2-one (CAS 41438-24-8)
- 4-(2-Furyl)-3-buten-2-one (CAS 623-15-4)
- 2-(2-Furyl)pyrrolidine (CAS 90086-89-8)
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Recommended Standards
- 6-Amino-2-oxo-1,2-dihydropyridine-3-carbonitrile (CAS 138060-95-4)
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- 3-Amino-2-hydroxypyridine-4-carbonitrile (CAS 1369248-53-2)
- 4-Amino-1-ethynylpyrimidin-2(1H)-one (CAS 141299-26-5)
- methyl 2-(4-amino-1H-pyrazol-1-yl)-2-methylpropanoate (CAS 1935209-36-1)
- 2,4-Difluoro-3-methoxyphenol (CAS 886499-27-0)
- 3-(2-Chloro-4-fluorophenyl)propanoic Acid (CAS 174603-38-4)
- 1159977-17-9 2-(1,1-Dimethylethyl)-1,3-dioxane-5-carboxylic Acid Methyl Ester 2-tert-Butyl-1,3-dioxane-5-carboxylic Acid Methyl Ester (CAS 1159977-17-9)
- 7-(Trifluoromethoxy)isoquinolin-1(2H)-one (CAS 1184917-30-3)
- Urea, N-(hydroxyethyl)- (CAS 1320-51-0)
- 2,4,6-Trichloro-7-methyl-7H-pyrrolo[2,3-d]pyrimidine (CAS 1131992-46-5)
- Ethyl 5-(tetrahydrofuran-3-yl)-1,2,4-oxadiazole-3-carboxylate (CAS 1342608-24-5)
- 3-Cyclobutyl-2-fluoropropanoic acid (CAS 1531971-51-3)
- Insulin Degludec Impurity 1 (CAS 843666-26-2)
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