5-Chloro-1,1-dioxo-isothiazol-3-one CAS 1239320-63-8
| CAS No. | 1239320-63-8 |
| Molecular Formula | C3H2ClNO3S |
| Molecular Weight | 167.57 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
5-Chloro-1,1-dioxo-isothiazol-3-one (CAS 1239320-63-8) is a high-purity analytical reference standard with the molecular formula C3H2ClNO3S and a molecular weight of 167.57 g/mol.
Owing to an amide group, a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage, chlorine substitution, 5-Chloro-1,1-dioxo-isothiazol-3-one is typically white to pale yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 167.57 g/mol — guide the selection of appropriate sample preparation and analytical techniques. 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).
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
CATO manufactures 5-Chloro-1,1-dioxo-isothiazol-3-one under ISO 17034:2016 accreditation with dual CNAS and ANAB accreditation. Each batch is characterized by orthogonal methods and supplied with a full Certificate of Analysis (COA), ensuring metrological traceability.
Physical & Chemical Properties
| Molecular Formula | C3H2ClNO3S |
| Molecular Weight | 167.57 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.) | 1990 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 1 |
| Sulfur Atoms | 1 |
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Recommended Standards
- 2H-1,2,3-Triazole-4-sulfonyl chloride (CAS 1106727-22-3)
- Oxazole-2-sulfonyl chloride (CAS 184170-50-1)
- 1,2-Oxazole-4-sulfonyl chloride (CAS 933740-94-4)
- 4-(Chloromethyl)-5-(difluoromethyl)oxazole (CAS 2006920-94-9)
- 3-(pHenylethynyl)pyridine (CAS 13238-38-5)
- 5-Bromo-2,4-dichloroaniline (CAS 258344-01-3)
- Zinc(II) tetranitrophthalocyanine (CAS 100043-01-4)
- 1,3-Diethyl 2-(3-methylphenyl)propanedioate (CAS 94112-78-4)
- N-(2-((3,5-dimethyl-1H-pyrazol-4-yl)methyl)-1,3-dioxoisoindolin-4-yl)propionamide (CAS 50981-11-8)
- 5-[2-(5-chloro-1,3-dimethyl-1H-pyrazol-4-yl)vinyl]-3-[3,5-di(trifluoromethyl)phenyl]-1,2,4-oxadiazole (CAS 648410-32-6)
- Ethyl (3R,4R)-1-benzyl-4-(bromomethyl)pyrrolidine-3-carboxylate (CAS 1217186-54-3)
- Diethyl 3-oxooctanedioate (CAS 99683-30-4)
- Ethyl 6-(difluoromethyl)-5-methylnicotinate (CAS 1805010-20-1)
- Insulin Degludec Impurity 5 (CAS CATO-C4X-21575)
Why CATO?
- ISO 17034 accredited reference material producer (CNAS + ANAB dual accreditation)
- 130,000+ catalog items in stock, COA supplied with every batch
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