5-Ethylindole-2-carboxylic acid CAS 37033-93-5
| CAS No. | 37033-93-5 |
| Molecular Formula | C11H11NO2 |
| Molecular Weight | 189.21 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
As a certified reference material (CRM), 5-Ethylindole-2-carboxylic 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.
5-Ethylindole-2-carboxylic acid (CAS 37033-93-5), molecular formula C11H11NO2 and molecular weight 189.21 g/mol, is a CATO reference standard with documented purity and traceability.
Structurally, 5-Ethylindole-2-carboxylic acid (C11H11NO2) contains an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage. The molecule exhibits a degree of unsaturation (DBE) of 7.0, corresponding to approximately 7 ring(s) or double-bond equivalent(s). With a molecular weight of 189.21 g/mol, it falls into the medium-molecular-weight range. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.
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.
Physical & Chemical Properties
| Molecular Formula | C11H11NO2 |
| Molecular Weight | 189.21 g/mol |
| Appearance | Off-white to pale yellow crystalline powder |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light |
| Solubility (reference) | Soluble in chloroform, dichloromethane, ethyl acetate, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 7.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1967 |
| Nitrogen Atoms | 1 |
Related Ethylindole Standards
Recommended Standards
- 5-ethyl-1-methyl-1H-indole-2,3-dione (CAS 852399-54-3)
- 5-Ethylpyridine-3-sulfonyl fluoride (CAS 2137620-06-3)
- 5-Ethoxy-3-phenylisoxazole (CAS 23244-34-0)
- 5-Fluoro-2-methylbenzene-1-sulfonamide (CAS 2339-57-3)
- 4-Butylbenzothioamide (CAS 1208077-46-6)
- Antheraxanthin (CAS 68831-78-7)
- 2-(5-(5-Methyl-1-phenyl-1H-pyrazol-4-yl)-2-oxo-1,3,4-oxadiazol-3(2H)-yl)acetic acid (CAS 1216400-39-3)
- 4-Amino-5-methoxy-N,2-dimethylbenzenesulfonamide (CAS 49564-57-0)
- tert-Butyl 7-(2-ethoxy-2-oxoethyl)-3,4-dihydro-1,8-naphthyridine-1(2H)-carboxylate (CAS 243641-38-5)
- 5-Chloro-3-ethyl-2-methyl-1H-indole (CAS 672310-72-4)
- (R)-2-Amino-2-cyclopropylethanol hydrochloride (CAS 1401163-31-2)
- 2-(3-Chloroquinoxalin-2(1h)-ylidene)malononitrile (CAS 113983-94-1)
- Heptadecan-9-yl 8-((6-(heptyloxy)-6-oxohexyl)(2-hydroxyethyl)amino)octanoate (CAS 2714482-23-0)
- β-Asp9-Tirzepatide (CAS CATO-CPTD788931)
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