9-Oxo-9H-xanthene-2-carboxylic acid CAS 40274-67-7
| CAS No. | 40274-67-7 |
| Molecular Formula | C14H8O4 |
| Molecular Weight | 240.21 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Compared with other compounds in its class, the molecular weight of 240.21 g/mol gives 9-Oxo-9H-xanthene-2-carboxylic acid distinctive chromatographic separation conditions and mass-spectrometry parameter settings.
9-Oxo-9H-xanthene-2-carboxylic acid (CAS 40274-67-7) is a high-purity analytical reference standard with the molecular formula C14H8O4 and a molecular weight of 240.21 g/mol.
Structurally, 9-Oxo-9H-xanthene-2-carboxylic acid (C14H8O4) contains a carboxylic acid group, a hydroxyl group, an ether linkage, a polycyclic aromatic system. The molecule exhibits a degree of unsaturation (DBE) of 11.0, corresponding to approximately 11 ring(s) or double-bond equivalent(s). With a molecular weight of 240.21 g/mol, it falls into the medium-molecular-weight range. 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).
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
As a certified reference material (CRM), 9-Oxo-9H-xanthene-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.
Physical & Chemical Properties
| Molecular Formula | C14H8O4 |
| Molecular Weight | 240.21 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) | 11.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1968 |
Recommended Standards
- 6-Nitro-2-phenylbenzo[d]oxazole (CAS 3164-28-1)
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- Diethyl 2-Oxo-1,2-dihydro-4,5-pyrimidinedicarboxylate (CAS 62328-19-2)
- 4-(4-Methyl-4,5-dihydrooxazol-2-yl)aniline (CAS 144232-55-3)
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