4-Chloro-2-mercaptophenol CAS 21151-77-9
| CAS No. | 21151-77-9 |
| Molecular Formula | C6H5ClOS |
| Molecular Weight | 160.62 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
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.
4-Chloro-2-mercaptophenol (CAS 21151-77-9), molecular formula C6H5ClOS and molecular weight 160.62 g/mol, is a CATO reference standard with documented purity and traceability.
The molecular framework of 4-Chloro-2-mercaptophenol (C6H5ClOS) is characterized by sulfur-containing functionality, a hydroxyl group, an ether linkage, chlorine substitution, an aromatic ring system. In reversed-phase chromatography, its retention is governed primarily by the polarity and ionization state of its functional groups, which provides a practical basis for HPLC-UV/DAD or LC-MS method development. 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.
Physical & Chemical Properties
| Molecular Formula | C6H5ClOS |
| Molecular Weight | 160.62 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, keep tightly closed to prevent evaporation |
| Solubility (reference) | Soluble in methanol, acetonitrile, DMSO, water (slightly soluble) |
| Stability | May oxidize slowly on prolonged air exposure |
| Degree of Unsaturation (DBE) | 4.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1963 |
| Halogen Content | Cl-containing |
| Sulfur Atoms | 1 |
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Recommended Standards
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- 5-(3,4,5-Triethoxyphenyl)-1,3,4-oxadiazol-2-amine (CAS 19949-31-6)
- 1-[4-(Dimethylamino)-2-hydroxyphenyl]ethan-1-one (CAS 107070-69-9)
- 2-Bromo-5-(trifluoromethoxy)-4-(trifluoromethyl)pyridine (CAS 1361853-84-0)
- (5-Chloro-2-propoxyphenyl)methanamine (CAS 608524-02-3)
- 2,5-Dihexylterephthalonitrile (CAS 117635-25-3)
- 4-Hydroxy-3-methylcyclohexan-1-one (CAS 89897-04-1)
- N-(tert-butyl)-2-(2-methylthiazol-4-yl)acetamide (CAS 1311824-78-8)
- Semaglutide Impurity 21(HO-Ste-L-γGlu-AEEA-AEEA-OH) (CAS 1335440-44-2)
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