5-Fluoro-4-methyl-3,4-dihydroquinoxalin-2(1H)-one CAS 1856159-20-0
| CAS No. | 1856159-20-0 |
| Molecular Formula | C9H9FN2O |
| Molecular Weight | 180.18 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
5-Fluoro-4-methyl-3,4-dihydroquinoxalin-2(1H)-one (C9H9FN2O) contains a nitrogen-containing heterocyclic scaffold, an amide group, a hydroxyl group, an ether linkage, fluorine substitution. Halogen substitution raises its density and boiling point; 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).
CATO supplies 5-Fluoro-4-methyl-3,4-dihydroquinoxalin-2(1H)-one (CAS 1856159-20-0), a certified reference material (molecular formula C9H9FN2O, MW 180.18 g/mol) for analytical method development and quality control.
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.
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 | C9H9FN2O |
| Molecular Weight | 180.18 g/mol |
| Appearance | Off-white to pale yellow crystalline powder. (slight halide-like odor, faint amine-like odor) |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep tightly closed to prevent evaporation |
| Solubility (reference) | Soluble in DMSO, DMF, methanol |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 6.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1995 |
| Halogen Content | F-containing |
| Nitrogen Atoms | 2 |
Related Fluoro Standards
- 7-fluoro-4-methyl-1,2,3,4-tetrahydroquinoxalin-2-one (CAS 1033312-09-2)
- 7-Fluoro-4-methoxy-2,3-dihydro-1H-inden-1-one (CAS 1092347-31-3)
- 6-Fluoro-4-methoxy-2,3-dihydro-1H-inden-1-one (CAS 1092347-59-5)
- 4-Fluoro-6-methoxy-2,3-dihydro-1H-inden-1-one (CAS 1092347-61-9)
- 6-Fluoro-8-methylchroman-4-one (CAS 1092349-07-9)
- 6-Fluoro-7-methylchroman-4-one (CAS 1092349-34-2)
- 9-Fluoro-3,4-dihydrobenzo[b]oxepin-5(2H)-one (CAS 1094299-21-4)
- 6-Fluoro-3-methyl-chroman-4-one (CAS 113209-67-9)
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