2-Ethyl-3-thiophenecarboxylic acid CAS 77756-28-6
| CAS No. | 77756-28-6 |
| Molecular Formula | C7H8O2S |
| Molecular Weight | 156.20 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Under current pharmacopoeial and regulatory frameworks, quality-control requirements for this class of reference material explicitly involve the control of targets including 2-Ethyl-3-thiophenecarboxylic acid.
2-Ethyl-3-thiophenecarboxylic acid (CAS 77756-28-6) is a high-purity analytical reference standard with the molecular formula C7H8O2S and a molecular weight of 156.20 g/mol.
Structurally, 2-Ethyl-3-thiophenecarboxylic acid (C7H8O2S) contains a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage, an aromatic ring system. The molecule exhibits a degree of unsaturation (DBE) of 4.0, corresponding to approximately 4 ring(s) or double-bond equivalent(s). With a molecular weight of 156.20 g/mol, it falls into the medium-molecular-weight range. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
This reference standard is suitable for quantitative analysis on major chromatographic platforms including HPLC, GC, LC-MS/MS, and GC-MS, serving as an external calibration standard or a system suitability test reference material.
As a certified reference material (CRM), 2-Ethyl-3-thiophenecarboxylic acid 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 | C7H8O2S |
| Molecular Weight | 156.20 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C |
| 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.) | 1979 |
| Sulfur Atoms | 1 |
Related Ethyl Standards
- 2-thiophenecarboxylic acid, 4-amino- 2-thiophenecarboxylicacid,4-amino-(9ci) 4 - Aminothiophene - 2 - carboxylic acid 4-Amino-thiophene-2-carboxylic acid 4-amino-2-thiophenecarboxylic acid 4-aminothiophene-2-carboxylic acid 89499-38-7 (CAS 89499-38-7)
- 3-Thiophenecarboxylic acid, 5-ethyl-, hydrazide (9CI) 438225-57-1 (CAS 438225-57-1)
- 3-Thiophenecarboxylic acid, 4,5-dimethyl-, hydrazide (9CI) 524934-36-9 (CAS 524934-36-9)
- 2-Thiophenecarboxylic Acid (CAS 527-72-0)
- 3-Thiophenecarboxylic acid n-butyl ester (CAS 317385-62-9)
- 3-Thiophenecarboxylic acid, 5-propyl-, hydrazide (9CI) 438215-42-0 (CAS 438215-42-0)
- 3-Thiophenecarboxylic acid, 5-(1-methylethyl)-, hydrazide (9CI) 438221-49-9 (CAS 438221-49-9)
- 2-Thiophenecarboxylic acid 2-chloro-2,3-dihydro-3-oxo-, methyl ester (CAS 95201-94-8)
Recommended Standards
- 2,4-Dimethylthiophene-3-carboxylic acid (CAS 503308-96-1)
- 3-(Methoxymethyl)thiophene-2-carbaldehyde (CAS 59906-35-3)
- 2-(thiophen-3-yl)propanoic acid (CAS 78239-46-0)
- 3-Ethylthiophene-2-carboxylic acid (CAS 74965-84-7)
- Methyl 3-(4-aminophenoxy)benzoate hydrochloride (CAS 790262-20-3)
- 3-Nitro-1H-indole (CAS 4770-03-0)
- 4-(3-Methyl-2,3-dihydro-1H-pyrrolizin-5-yl)but-3-en-2-one (CAS 61687-23-8)
- 4-(3-(Trifluoromethyl)-3H-diazirin-3-yl)benzonitrile (CAS 128886-91-9)
- 2-(6-(Methyl(phenyl)amino)pyridin-3-yl)piperidine-1-carbaldehyde (CAS 1352501-27-9)
- 2-Chloro-7-methylpyrrolo[2,1-f][1,2,4]triazin-4(3H)-one (CAS 1613751-74-8)
- 3-Methyl-N-[2-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-4-pyridyl]cyclobutanecarboxamide (CAS 2246801-51-2)
- 2-Oxo-2,3,4,5-tetrahydro-1H-benzo[b]azepine-7-carboxylic acid (CAS 117030-69-0)
- Ethyl 6-methyl-4-oxo-3H,4H-furo[2,3-d]pyrimidine-5-carboxylate (CAS 848316-19-8)
- (2S)-2-amino-4-(hydroxymethylphosphinyl)butanoyl-L-alanyl-L-alanine (2S)-2-amino-4-[hydroxy(methyl)phosphinoyl]butyryl-L-alanyl-L-alanine 2-Amino-4-(methylphosphino)butyrylalanylalanine 35597-43-4 Antibiotic SF 1293 Bialaphos CHEBI:3088 L-phosphinothricyl-L-alanyl-L-alanine N-{(2S)-2-amino-4-[hydroxy(methyl)phosphoryl]butanoyl}-L-alanyl-L-alanine PTT Phosphinothricylalanylalanine bilanafos gamma-(Hydroxymethylphosphinyl)-L-alpha-aminobutyryl-L-alanyl-L-alanine phosphinothricin tripeptide (CAS 35597-43-4)
Why CATO?
- ISO 17034 accredited reference material producer (CNAS + ANAB dual accreditation)
- 130,000+ catalog items in stock, COA supplied with every batch
- Worldwide shipping with full export documentation (HS code guidance available)
- Technical support: +86 18665070610 / Nicole.chen@cato-chem.com