1-(2-Oxo-2,3-dihydro-1,3-benzoxazol-5-yl)cyclopropane-1-carboxylic acid CAS 945244-05-3
| CAS No. | 945244-05-3 |
| Molecular Formula | C11H9NO4 |
| Molecular Weight | 219.19 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-Oxo-2,3-dihydro-1,3-benzoxazol-5-yl)cyclopropane-1-carboxylic acid (CAS 945244-05-3) is a high-purity analytical reference standard with the molecular formula C11H9NO4 and a molecular weight of 219.19 g/mol.
The molecular framework of 1-(2-Oxo-2,3-dihydro-1,3-benzoxazol-5-yl)cyclopropane-1-carboxylic acid (C11H9NO4) is characterized by an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage. In reversed-phase chromatography, its retention is governed primarily by the protonation state of its nitrogen-containing groups, which provides a practical basis for HPLC-UV/DAD or LC-MS method development. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
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 | C11H9NO4 |
| Molecular Weight | 219.19 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 methanol, ethanol, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 8.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1987 |
| Nitrogen Atoms | 1 |
Related Oxo Standards
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Recommended Standards
- (S)-N-(2,5-Dioxotetrahydrofuran-3-yl)benzamide (CAS 54819-23-7)
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- (Benzofuran-2-carbonyl)glycine (CAS 69826-70-6)
- 1-Fluoro-2-(methylsulphonyl)-4-nitrobenzene (CAS 914636-41-2)
- 2-(2-tert-Butyl-1,3-thiazol-4-yl)acetonitrile (CAS 251111-86-1)
- 1,4,7,10,13,16,19,22,25,28-Decaoxacyclotriacontane (CAS 52985-64-5)
- 6-Bromo-3-chloropyrazolo[1,5-a]pyrimidine (CAS 1958106-07-4)
- 6-Chloro-N-cyclohexyl-N-methyl-2-pyrazinamine (CAS 1220020-21-2)
- 5,6-Dichloro-4-hydroxypyrimidine (CAS 88982-91-6)
- 2-Amino-8-methyldibenzo[b,f][1,4]oxazepin-11(10H)-one (CAS 23474-59-1)
- 1-(5-(1-Ethyl-1H-pyrazol-5-yl)-1,2,4-oxadiazol-3-yl)-N-methylmethanamine (CAS 1707562-47-7)
- 2-[4-(Methylamino)-phenyl]-6-benzothiazolol (CAS 566169-93-5)
- Benzyl 2-(3-methylpyridin-2-yl)piperidine-1-carboxylate (CAS 1352511-15-9)
- Semaglutide impurity 271 (CAS CATO-C4X-2226271)
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