4-(Thiophen-2-yl)isoxazol-3(2H)-one CAS 204510-26-9
| CAS No. | 204510-26-9 |
| Molecular Formula | C7H5NO2S |
| Molecular Weight | 167.19 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Under current pharmacopoeial and regulatory frameworks, quality-control requirements for this class of reference material explicitly involve the control of targets including 4-(Thiophen-2-yl)isoxazol-3(2H)-one.
4-(Thiophen-2-yl)isoxazol-3(2H)-one (CAS 204510-26-9) is a high-purity analytical reference standard with the molecular formula C7H5NO2S and a molecular weight of 167.19 g/mol.
Based on its molecular formula C7H5NO2S, 4-(Thiophen-2-yl)isoxazol-3(2H)-one contains an amide group, a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage, an aromatic ring system; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 167.19 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).
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
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 | C7H5NO2S |
| Molecular Weight | 167.19 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.) | 2015 |
| Nitrogen Atoms | 1 |
| Sulfur Atoms | 1 |
Related Thiophen Standards
- 3-(Thiophen-2-yl)-1,2-oxazol-5-ol (CAS 1354918-21-0)
- 4-(Thiophen-2-yl)-1,2,5-oxadiazol-3-amine (CAS 186509-03-5)
- 2-(Thiophen-2-yl)oxazol-5(4H)-one (CAS 230283-16-6)
- 5-(Thiophen-2-yl)-1,2,4-oxadiazol-3-amine (CAS 73631-19-3)
- 5-(Thiophen-3-yl)-1,2,4-oxadiazol-3-amine (CAS 73631-20-6)
- 5-Thiophen-2-yl-[1,3,4]oxadiazol-2-ylamine (CAS 27049-71-4)
- 4-(Thiophen-2-yl)pyrrolidin-2-one (CAS 88221-12-9)
- 2-(THiophen-2-yl)-1,3-thiazole (CAS 42140-95-4)
Recommended Standards
- 3-Methylthiazolo[4,5-c]pyridazin-6(1H)-one (CAS 82608-23-9)
- 4-Amino-6-mercaptopyrazolo[3,4-d]pyrimidine (CAS 23771-52-0)
- 3-Methylisothiazolo[5,4-d]pyrimidin-4(5h)-one (CAS 58648-95-6)
- 4-Amino-benzo[1,2,5]thiadiazol-5-ol (CAS 3177-69-3)
- 2-amino-4,4-difluorobutanoic acid hydrochloride (CAS 252357-32-7)
- 2-Chloro-4-iodo-3-methoxypyridine (CAS 1227592-88-2)
- methyl 2-amino-3-(methylsulfanyl)benzoate hydrochloride (CAS 1797033-40-9)
- Hexane-2-sulfonyl chloride (CAS 872309-34-7)
- [(2-Methoxyphenyl)methyl](propyl)amine hydrochloride (CAS 1158367-01-1)
- 3-Iodo-6-methoxy-1H-pyrrolo[3,2-b]pyridine (CAS 1190323-03-5)
- N-{[3-(2-chlorophenyl)-1,2-oxazol-5-yl]methyl}-2-methylpropanamide (CAS 551921-30-3)
- tert-Butyl 3-((4-fluorophenyl)amino)pyrrolidine-1-carboxylate (CAS 853577-87-4)
- N-(3,4-Dichlorobenzyl)piperidin-4-amine hydrochloride (CAS 1261230-43-6)
- Tirzepatide Impurity 23 X TFA Salt (CAS CATO-C4X-324023)
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