1-(2-(2-Chloro-6H-indolo[2,3-b]quinoxalin-6-yl)acetyl)-3-methyl-4-(1-phenylethylidene)-1H-pyrazol-5(4H)-one CAS 119457-18-0
| CAS No. | 119457-18-0 |
| Molecular Formula | C28H20ClN5O2 |
| Molecular Weight | 493.94 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
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.
1-(2-(2-Chloro-6H-indolo[2,3-b]quinoxalin-6-yl)acetyl)-3-methyl-4-(1-phenylethylidene)-1H-pyrazol-5(4H)-one (CAS 119457-18-0) is a high-purity analytical reference standard with the molecular formula C28H20ClN5O2 and a molecular weight of 493.94 g/mol.
1-(2-(2-Chloro-6H-indolo[2,3-b]quinoxalin-6-yl)acetyl)-3-methyl-4-(1-phenylethylidene)-1H-pyrazol-5(4H)-one (C28H20ClN5O2) contains a steroid core, an amide group, a hydroxyl group, an ether linkage, chlorine substitution. It is notably hygroscopic, halogen substitution raises its density and boiling point, the carboxyl group imparts weak acidity; these physicochemical properties determine the optimal preparation and storage of its standard solutions. Halogen substitution (F/Cl/Br/I) produces a distinctive isotope pattern in mass spectrometry, a valuable aid for qualitative confirmation.
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 | C28H20ClN5O2 |
| Molecular Weight | 493.94 g/mol |
| Appearance | Pale yellow to yellow crystalline powder. (slight halide-like odor) |
| Purity | 97%+ |
| Storage | Store in a cool place (≤25°C), protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in DMSO, DMF, methanol |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 21.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1991 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 5 |
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Recommended Standards
- 1-Tetratriacontanamine (CAS 66214-29-7)
- N-(benzo[d][1,3]dioxol-5-ylmethyl)-3-((4-chlorophenyl)sulfonyl)-[1,2,3]triazolo[1,5-a]quinazolin-5-amine (CAS 895646-86-3)
- Mosapride Impurity 45 (CAS CATO-C4X-104445)
- 4,6-Dibromo-2-(3-iodophenyl)benzo[d]oxazol-5-amine (CAS 586996-09-0)
- tert-butyl 3-({[(4-methyl-1,3-thiazol-5-yl)methyl]amino}methyl)pyrrolidine-1-carboxylate (CAS 1803608-82-3)
- 6-Bromo-3-phenyl-2H-benzo[e][1,2,4]thiadiazine 1,1-dioxide (CAS 1193389-22-8)
- 3-(7-Methoxybenzo[d][1,3]dioxol-5-yl)acrylic acid (CAS 871898-08-7)
- 2-Chloro-5-(2,5-dioxo-pyrrolidin-1-yl)-benzoic acid (CAS 313480-55-6)
- 5-((5-Methyl-2H-pyrrol-2-ylidene)methyl)-1H,1'H-2,2'-bipyrrole (CAS 802868-73-1)
- Ethyl 6-[(4-aminocyclohexyl)oxy]pyridine-3-carboxylate (CAS 1274530-16-3)
- 5-(1-Butylpiperidin-2-yl)-N-cyclopropylpyridin-2-amine (CAS 1352492-48-8)
- N-(4-Fluorophenyl)-1,3-propanesultam (CAS 1225954-11-9)
- tert-Butyl ((1R,2R,4S)-7-azabicyclo[2.2.1]heptan-2-yl)carbamate (CAS 2098589-06-9)
- Semaglutide Impurity 177 (CAS CATO-C4X-2226177)
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