5-Chloroindoline-2-carboxylic acid CAS 10241-98-2
| CAS No. | 10241-98-2 |
| Molecular Formula | C9H8ClNO2 |
| Molecular Weight | 197.62 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
5-Chloroindoline-2-carboxylic acid (CAS 10241-98-2), molecular formula C9H8ClNO2 and molecular weight 197.62 g/mol, is a CATO reference standard with documented purity and traceability.
5-Chloroindoline-2-carboxylic acid (C9H8ClNO2) contains a nitrogen-containing heterocyclic scaffold, an amide group, a hydroxyl group, an ether linkage, chlorine substitution. 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. The presence of an aromatic ring or conjugated system gives the compound characteristic absorption bands in the UV-Vis region, making it well suited to UV or diode-array detection (DAD).
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 | C9H8ClNO2 |
| Molecular Weight | 197.62 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 methanol, acetonitrile, DMSO, water (slightly soluble) |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 6.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1959 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 1 |
Related Chloroindoline Standards
- (2S)-5-chloroindoline-2-carboxylic acid (CAS 1344408-15-6)
- 5-Chloroindoline-1-carboxamide (CAS 55613-58-6)
- 5-Chloroindoline-2-thione (CAS 73424-95-0)
- 6-Chloroindoline-2-thione (CAS 392332-34-2)
- 5-Chloroindoline-1-carbothioamide (CAS 56632-36-1)
- 25658-80-4 5-Chloroindoline 5-chloro-2,3-dihydro-(1h)-indole 5-chloro-2,3-dihydro-1h-indole (CAS 25658-80-4)
- 1-Acetyl-6-chloroindoline-5-carboxylic acid (CAS 1375473-23-6)
- 7-Chloroindoline (CAS 114144-22-8)
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