Diflunisal impurity 5 CAS 53591-79-0
| CAS No. | 53591-79-0 |
| Molecular Formula | C14H10F2O |
| Molecular Weight | 232.23 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Recommended for quantitative analysis by HPLC, GC, LC-MS/MS, or GC-MS as an external calibration standard; it can also be used for spiked-recovery experiments, LOD/LOQ determination, and LC-MS/MS multiple-reaction-monitoring (MRM) calibration.
Diflunisal impurity 5 (CAS 53591-79-0) is a certified pharmaceutical impurity reference standard with the molecular formula C14H10F2O and a molecular weight of 232.23 g/mol.
Owing to a hydroxyl group, an ether linkage, fluorine substitution, a polycyclic aromatic system, Diflunisal impurity 5 is typically pale yellow to yellow low-melting solid. Its solid-state physicochemical attributes — including a molecular weight of 232.23 g/mol — guide the selection of appropriate sample preparation and analytical techniques. The high carbon-to-hydrogen ratio imparts good lipophilicity, allowing liquid-liquid extraction with non-polar solvents such as n-hexane or ethyl acetate.
The assigned purity is verified by mass-balance and quantitative NMR (qNMR) approaches, with the expanded uncertainty reported at a 95% confidence level (k=2). Batch homogeneity and stability are independently assessed for every lot.
Physical & Chemical Properties
| Molecular Formula | C14H10F2O |
| Molecular Weight | 232.23 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep tightly closed to prevent evaporation |
| 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) | 9.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1972 |
| Halogen Content | F-containing |
Related Diflunisal Standards
Recommended Standards
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- Thioctic acid Impurity 36 (CAS 2635383-46-7)
- Atriopeptin II (rat) (H-2110.0500) (CAS 89139-54-8)
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- Benzyl (R)-((1-methylpyrrolidin-3-yl)methyl)carbamate (CAS 1379580-96-7)
- 4-(2-Bromo-4,6-difluorophenylsulfonyl)morpholine (CAS 1179860-20-8)
- tert-butyl 5-(tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole-1-carboxylate (CAS 1256359-17-7)
- 6-Chloro-4-oxo-1,4-dihydroquinoline-3-carboxylic acid (CAS 53977-19-8)
- D-[Phe]6-Semaglutide (CAS CATO-CPTD788633)
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