6-Ethyl-4-oxo-4H-chromene-2-carboxylic acid CAS 5527-91-3
| CAS No. | 5527-91-3 |
| Molecular Formula | C12H10O4 |
| Molecular Weight | 218.21 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
As a certified reference material (CRM), 6-Ethyl-4-oxo-4H-chromene-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.
6-Ethyl-4-oxo-4H-chromene-2-carboxylic acid (CAS 5527-91-3), molecular formula C12H10O4 and molecular weight 218.21 g/mol, is a CATO reference standard with documented purity and traceability.
6-Ethyl-4-oxo-4H-chromene-2-carboxylic acid (C12H10O4) contains a carboxylic acid group, a hydroxyl group, an ether linkage, an aromatic ring system. It is notably hygroscopic, its high carbon-to-hydrogen ratio confers good lipid solubility, the carboxyl group imparts weak acidity; these physicochemical properties determine the optimal preparation and storage of its standard solutions. 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.
Physical & Chemical Properties
| Molecular Formula | C12H10O4 |
| Molecular Weight | 218.21 g/mol |
| Appearance | Pale yellow to yellow crystalline powder |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in chloroform, dichloromethane, ethyl acetate, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 8.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1958 |
Recommended Standards
- 6-Ethyl-4-oxo-1,4-dihydrocinnoline-3-carboxylic acid (CAS 36991-45-4)
- 6-Methyl-4-oxo-4H-pyrido[1,2-a]pyrimidine-2-carboxylic acid methyl ester (CAS 2122461-94-1)
- 6-Ethyl-3-nitroquinolin-4-ol (CAS 628284-99-1)
- 6-Oxo-1-phenyl-1,4,5,6-tetrahydropyridazine-3-carboxylic acid (CAS 33548-33-3)
- (1R,2R,3S)-3-Aminocyclopentane-1,2-diol (CAS 1932503-56-4)
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- 2-(3-Bromo-4-fluorophenyl)acetonitrile, 97% (CAS 501420-63-9)
- Semaglutide Impurity 157 (x TFA Salt) (CAS CATO-C4X-2226157)
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