7-fluoro-2-oxo-3H-1,3-benzoxazole-4-sulfonyl chloride CAS 2387598-04-9
| CAS No. | 2387598-04-9 |
| Molecular Formula | C7H9ClFNO4S |
| Molecular Weight | 257.67 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
7-fluoro-2-oxo-3H-1,3-benzoxazole-4-sulfonyl chloride (C7H9ClFNO4S) contains an amide group, a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage, fluorine/chlorine substitution. It is notably hygroscopic, halogen substitution raises its density and boiling point, the carboxyl group imparts weak acidity; these physicochemical properties determine the optimal preparation and storage of its standard solutions. Halogen substitution (F/Cl/Br/I) produces a distinctive isotope pattern in mass spectrometry, a valuable aid for qualitative confirmation.
7-fluoro-2-oxo-3H-1,3-benzoxazole-4-sulfonyl chloride (CAS 2387598-04-9), molecular formula C7H9ClFNO4S and molecular weight 257.67 g/mol, is a CATO reference standard with documented purity and traceability.
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 | C7H9ClFNO4S |
| Molecular Weight | 257.67 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry, keep tightly closed to prevent evaporation |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO, water |
| 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) | 3.0 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 1999 |
| Halogen Content | F/Cl-containing |
| Nitrogen Atoms | 1 |
| Sulfur Atoms | 1 |
Related fluoro Standards
- 5-fluoro-2-oxo-3H-1,3-benzoxazole-6-sulfonyl chloride (CAS 1368799-14-7)
- 4-fluoro-2-oxo-3H-1,3-benzoxazole-6-sulfonyl chloride (CAS 1500833-43-1)
- 5-fluoro-2-oxo-3H-1,3-benzoxazole-7-sulfonyl chloride (CAS 1782343-61-6)
- 4-fluoro-2-oxo-3H-1,3-benzoxazole-5-sulfonyl chloride (CAS 2387598-65-2)
- 4-fluoro-2-oxo-3H-1,3-benzoxazole-7-sulfonyl chloride (CAS 2387597-04-6)
- 5-fluoro-2-oxo-3H-1,3-benzoxazole-4-sulfonyl chloride (CAS 2387597-38-6)
- 6-fluoro-2-oxo-3H-1,3-benzoxazole-4-sulfonyl chloride (CAS 2387599-05-3)
- 6-fluoro-2-oxo-3H-1,3-benzoxazole-5-sulfonyl chloride (CAS 2387595-09-5)
Recommended Standards
- 7-Chloro-2-phenyl-4H-benzo[d][1,3]oxazin-4-one (CAS 7033-52-5)
- 7-fluoro-2-oxo-3H-1,3-benzoxazole-5-sulfonyl chloride (CAS 2387598-85-6)
- 6-fluoro-2-oxo-3H-1,3-benzoxazole-7-sulfonyl chloride (CAS 2387595-63-1)
- Amino acid Impurity 25 (CAS 742100-87-4)
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