2-(2,3,4,5-Tetramethylbenzylidene)-1H-indene-1,3(2H)-dione CAS 54689-89-3
| CAS No. | 54689-89-3 |
| Molecular Formula | C20H18O2 |
| Molecular Weight | 290.36 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
2-(2,3,4,5-Tetramethylbenzylidene)-1H-indene-1,3(2H)-dione (CAS 54689-89-3), molecular formula C20H18O2 and molecular weight 290.36 g/mol, is a CATO reference standard with documented purity and traceability.
Based on its molecular formula C20H18O2, 2-(2,3,4,5-Tetramethylbenzylidene)-1H-indene-1,3(2H)-dione contains a steroid core, a hydroxyl group, an ether linkage; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 290.36 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. The high carbon-to-hydrogen ratio imparts good lipophilicity, allowing liquid-liquid extraction with non-polar solvents such as n-hexane or ethyl acetate.
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-(2,3,4,5-Tetramethylbenzylidene)-1H-indene-1,3(2H)-dione 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 | C20H18O2 |
| Molecular Weight | 290.36 g/mol |
| Appearance | Pale yellow to 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) | 12.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1972 |
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