Ethyl 5-Chlorothiophene-2-carboxylate CAS 5751-82-6
| CAS No. | 5751-82-6 |
| Molecular Formula | C7H7ClO2S |
| Molecular Weight | 190.65 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.
CATO supplies Ethyl 5-Chlorothiophene-2-carboxylate (CAS 5751-82-6), a certified reference material (molecular formula C7H7ClO2S, MW 190.65 g/mol) for analytical method development and quality control.
Ethyl 5-Chlorothiophene-2-carboxylate (C7H7ClO2S) contains a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage, chlorine substitution, an aromatic ring system. Halogen substitution raises its density and boiling point, the carboxyl group imparts weak acidity; these physicochemical properties determine the optimal preparation and storage of its standard solutions. 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).
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 | C7H7ClO2S |
| Molecular Weight | 190.65 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; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 4.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1958 |
| Halogen Content | Cl-containing |
| Sulfur Atoms | 1 |
Related Ethyl Standards
- Ethyl 2-chlorothiophene-3-carboxylate (CAS 1214379-28-8)
- Ethyl 3-chlorothiophene-2-carboxylate (CAS 153562-66-4)
- Ethyl 4-chlorothiophene-2-carboxylate (CAS 59614-94-7)
- ethyl 5-chlorothiophene-3-carboxylate (CAS 189331-32-6)
- 2-Chlorothiophene-3-sulfonamide (CAS 1773488-28-0)
- 3-chlorothiophene-2-sulfonamide (CAS 850340-85-1)
- 4-Chlorothiophene-2-sulfonamide (CAS 519055-68-6)
- 5-Chlorothiophene-2-sulfonamide (CAS 53595-66-7)
Recommended Standards
- Famotidine Impurity 02 (CAS 81152-53-6)
- 6-Chloro-3-methyl-2-(methylthio)pyrimidin-4(3H)-one (CAS 89466-43-3)
- Methyl 2-(5-chlorothiophen-2-yl)acetate (CAS 71637-28-0)
- 5-Chloro-6-methyl-2-methylsulfanylpyrimidin-4-ol (CAS 6328-59-2)
- (R)-2-Amino-4-oxo-4-(tritylamino)butanoic acid hydrate (CAS 1998701-21-5)
- 4-Chloro-3,5-dimethylpicolinonitrile (CAS 1323392-95-5)
- 4-Methyl-4h-1,2,4-triazol-3-amine (CAS 16681-76-8)
- (3-Fluoro-5-(pentafluoro-λ6-sulfanyl)phenyl)methanol (CAS 1240257-89-9)
- 2-Imino-10-methyl-1-propyl-3-tosyl-1H-dipyrido[1,2-a:2',3'-d]pyrimidin-5(2H)-one (CAS 606958-77-4)
- 34284-28-1 Methyl acetoacetate sodium salt Sodium methyl acetoacetate (CAS 34284-28-1)
- 2-Methoxy-n-(2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzyl)ethan-1-amine (CAS 1150271-51-4)
- (R)-Sulindac Methyl Ester (CAS 929081-61-8)
- Phenyl n-(piperidin-4-yl)carbamate hydrochloride (CAS 1251924-51-2)
- Semaglutide Impurity 140 (CAS CATO-C4X-2226140)
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