5-Chlorothiophene-2-carbonyl Chloride CAS 42518-98-9
| CAS No. | 42518-98-9 |
| Molecular Formula | C5H2Cl2OS |
| Molecular Weight | 181.04 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
5-Chlorothiophene-2-carbonyl Chloride (CAS 42518-98-9), molecular formula C5H2Cl2OS and molecular weight 181.04 g/mol, is a CATO reference standard with documented purity and traceability.
Based on its molecular formula C5H2Cl2OS, 5-Chlorothiophene-2-carbonyl Chloride contains sulfur-containing functionality, a hydroxyl group, an ether linkage, chlorine substitution; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 181.04 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. Halogen substitution (F/Cl/Br/I) produces a distinctive isotope pattern in mass spectrometry, a valuable aid for qualitative confirmation.
As a certified reference material (CRM), 5-Chlorothiophene-2-carbonyl Chloride meets the metrological traceability requirements of ISO/IEC 17025 laboratories. Batch-to-batch consistency is monitored via control charts to guarantee comparable assigned values across lots.
Physical & Chemical Properties
| Molecular Formula | C5H2Cl2OS |
| Molecular Weight | 181.04 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 |
| CAS Registry Year (est.) | 1969 |
| Halogen Content | Cl-containing |
| Sulfur Atoms | 1 |
Related Chlorothiophene Standards
- methyl 4-chlorothiophene-2-carboxylate (CAS 88105-19-5)
- methyl 5-chlorothiophene-3-carboxylate (CAS 36157-43-4)
- 5-Chlorothiophene-2-sulfinic acid (CAS 126714-86-1)
- 5-Chlorothiophene-2-carbothioamide (CAS 85347-12-2)
- 4-Chlorothiophene-2-carbohydrazide (CAS 1263212-33-4)
- 3-Chlorothiophene-2-carbohydrazide (CAS 478483-31-7)
- 5-Chlorothiophene-2-carbohydrazide (CAS 351983-31-8)
- Methyl 2-chlorothiophene-3-carboxylate (CAS 76360-42-4)
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