4,5-Dichlorothiophene-3-carboxylic acid CAS 123418-70-2
| CAS No. | 123418-70-2 |
| Molecular Formula | C5H2Cl2O2S |
| Molecular Weight | 197.04 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.
CATO supplies 4,5-Dichlorothiophene-3-carboxylic acid (CAS 123418-70-2), a certified reference material (molecular formula C5H2Cl2O2S, MW 197.04 g/mol) for analytical method development and quality control.
4,5-Dichlorothiophene-3-carboxylic acid (C5H2Cl2O2S) contains a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage, chlorine substitution. 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. Halogen substitution (F/Cl/Br/I) produces a distinctive isotope pattern in mass spectrometry, a valuable aid for qualitative confirmation.
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 | C5H2Cl2O2S |
| Molecular Weight | 197.04 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; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 4.0 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 1992 |
| Halogen Content | Cl-containing |
| Sulfur Atoms | 1 |
Related Dichlorothiophene Standards
- 2,4-Dichlorothiophene-3-carboxylic acid (CAS 1934940-61-0)
- 3-Acetyl-2,5-dichlorothiophene (CAS 36157-40-1)
- 2,5-dichlorothiophene-3-carbaldehyde (CAS 61200-60-0)
- 3,4-Dichlorothiophene 1,1-dioxide (CAS 52819-14-4)
- 3,5-Dichlorothiophene-2,4-dicarbaldehyde (CAS 1823800-83-4)
- 2,5-Dichlorothiophene-3,4-dicarbaldehyde (CAS 55581-76-5)
- 4,5-Dichlorothiophene-2,3-dicarbaldehyde (CAS 89465-82-7)
- Methyl 2,5-dichlorothiophene-3-carboxylate (CAS 145129-54-0)
Recommended Standards
- (E)-3-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)acrylamide (CAS 1228646-19-2)
- 2,5-dichlorothiazole-4-carboxamide (CAS 127426-27-1)
- Flurbiprofen Impurity 74 (CAS CATO-C4X-144474)
- 4-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)-4,5-dihydroisoxazole (CAS 1446105-21-0)
- Methyl 4-(2,5-difluorophenyl)-2,4-dioxobutanoate (CAS 175711-74-7)
- N-(Thiazol-2-yl)-5-((m-tolyloxy)methyl)furan-2-carboxamide (CAS 878716-43-9)
- 2-(3,6-Difluoro-2-methoxyphenyl)acetonitrile (CAS 1261760-73-9)
- 1794905-25-1 Acetanthranil-d3 (CAS 1794905-25-1)
- 3,3-difluoro-5-nitro-2,3-dihydro-1H-indol-2-one (CAS 197067-34-8)
- 4-(4-Methylpiperazin-1-yl)benzothioamide (CAS 229970-90-5)
- 1-(5-(4-Amino-2-methoxyphenyl)furan-2-yl)ethanone (CAS 886494-54-8)
- 5-Bromo-2-methyl-2,3-dihydro-1H-inden-1-one (CAS 104107-22-4)
- (5-Methylisoxazol-4-yl)boronic acid (CAS 1012084-55-7)
- Semaglutide impurity 100 (CAS CATO-C4X-2226100)
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