5-Chloro-2-Methyl-4-Isothiazolin-3-One CAS 26172-55-4
| CAS No. | 26172-55-4 |
| Molecular Formula | C4H4ClNOS |
| Molecular Weight | 149.60 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Owing to an amide group, sulfur-containing functionality, a hydroxyl group, an ether linkage, chlorine substitution, 5-Chloro-2-Methyl-4-Isothiazolin-3-One is typically white to pale yellow liquid. Its solid-state physicochemical attributes — including a molecular weight of 149.60 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).
CATO supplies 5-Chloro-2-Methyl-4-Isothiazolin-3-One (CAS 26172-55-4), a certified reference material (molecular formula C4H4ClNOS, MW 149.60 g/mol) for analytical method development and quality control.
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 | C4H4ClNOS |
| Molecular Weight | 149.60 g/mol |
| Purity | >95% |
| Storage | Store at 2-8°C, protect from light, keep tightly closed to prevent evaporation |
| 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) | 3.0 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 1964 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 1 |
| Sulfur Atoms | 1 |
Related Chloro Standards
- (5-Chloro-1,3,4-thiadiazol-2-yl)methanamine (CAS 1935236-26-2)
- 4-Chloro-2-methylisothiazol-3(2H)-one (CAS 71091-90-2)
- 4-Chloro-3-methoxyisothiazole (CAS 78383-41-2)
- 5-Chloro-3-(methylthio)-1H-1,2,4-triazole (CAS 51108-40-8)
- 5-Chloro-N-methyl-1,3,4-thiadiazol-2-amine (CAS 68429-94-7)
- 4-chloro-N-methyl-3-oxo-butanamide (CAS 1314919-68-0)
- 2-Chloro-1-(3-hydroxy-1-azetidinyl)ethanone (CAS 1628263-61-5)
- 3-Chloro-4-hydroxypiperidin-2-one (CAS 174204-83-2)
Recommended Standards
- Cefmetazole Impurity 21 (CAS 52069-55-3)
- 5-chloro-3-methylpyrazin-2-amine (CAS 1001050-30-1)
- (3R)-1-(2-chloroethyl)pyrrolidin-3-ol (CAS 1039826-52-2)
- (6-chloropyrazin-2-yl)methanamine (CAS 1060814-52-9)
- N-((5-mercapto-4-methyl-4H-1,2,4-triazol-3-yl)methyl)-4-methylbenzenesulfonamide (CAS 338421-91-3)
- (5-((4-Chlorobenzyl)sulfonyl)-1-methyl-3-(trifluoromethyl)-1H-pyrazol-4-yl)methyl propionate (CAS 955976-43-9)
- 3-Chloro-5-(trifluoromethyl)phenyl trifluoromethanesulfonate (CAS 1446016-94-9)
- 3-Chloromethyl-2-fluoro-4-(trifluoromethyl)pyridine (CAS 1227564-40-0)
- (E)-1-(Adamantan-1-yl)ethan-1-one oxime (CAS 78679-71-7)
- 2-methyl-1,3-benzothiazole-4-carbaldehyde (CAS 1261784-71-7)
- (2,4-Dimethylcyclohex-3-ene-1,1-diyl)dimethanol (CAS 117933-62-7)
- 2-methylidene-1$l^{6}-thiolane-1,1-dione (CAS 79496-71-2)
- 2-(Benzofuran-2-yl)-4-(tert-butyl)morpholine (CAS 119491-61-1)
- Semaglutide impurity 206 (CAS CATO-C4X-2226206)
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