5-Chloro-2-oxo-2,3-dihydro-1,3-benzoxazole-6-sulfonyl chloride CAS 5791-05-9
| CAS No. | 5791-05-9 |
| Molecular Formula | C7H3Cl2NO4S |
| Molecular Weight | 268.07 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Structurally, 5-Chloro-2-oxo-2,3-dihydro-1,3-benzoxazole-6-sulfonyl chloride (C7H3Cl2NO4S) contains an amide group, a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage, chlorine substitution, an aromatic ring system. The molecule exhibits a degree of unsaturation (DBE) of 6.0, corresponding to approximately 6 ring(s) or double-bond equivalent(s). With a molecular weight of 268.07 g/mol, it falls into the medium-molecular-weight range. 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).
5-Chloro-2-oxo-2,3-dihydro-1,3-benzoxazole-6-sulfonyl chloride (CAS 5791-05-9), molecular formula C7H3Cl2NO4S and molecular weight 268.07 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 | C7H3Cl2NO4S |
| Molecular Weight | 268.07 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) | 6.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1958 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 1 |
| Sulfur Atoms | 1 |
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- 6-methylimidazo[1,2-a]pyridine-2-carboxylic acid hydrochloride (CAS 2060034-47-9)
- 3-Amino-N-(4-methoxyphenyl)benzene-1-sulfonamide (CAS 201996-24-9)
- Dimethylamino-PEG3 (CAS 2741-30-2)
- 5-Amino-6-chloronicotinonitrile (CAS 1260672-23-8)
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- Peptide-GMF (CAS CATO-CPTD788469)
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