5-Chlorobenzofuran-7-carboxylic acid CAS 99517-24-5
| CAS No. | 99517-24-5 |
| Molecular Formula | C9H5ClO3 |
| Molecular Weight | 196.59 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
5-Chlorobenzofuran-7-carboxylic acid (C9H5ClO3) contains a carboxylic acid group, a hydroxyl group, an ether linkage, chlorine substitution, an aromatic ring system. 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. 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).
5-Chlorobenzofuran-7-carboxylic acid (CAS 99517-24-5) is a high-purity analytical reference standard with the molecular formula C9H5ClO3 and a molecular weight of 196.59 g/mol.
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 | C9H5ClO3 |
| Molecular Weight | 196.59 g/mol |
| Appearance | Off-white to pale yellow crystalline powder. (slight halide-like odor) |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry, keep tightly closed to prevent evaporation |
| 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; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 7.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1985 |
| Halogen Content | Cl-containing |
Related Chlorobenzofuran Standards
- 5-Chlorobenzofuran-2-carboxylic Acid (CAS 10242-10-1)
- 7-Chlorobenzofuran-4-carboxylic acid (CAS 1038509-42-0)
- 3-Chlorobenzofuran-5-carboxylic acid (CAS 1379278-90-6)
- 2-Chlorobenzofuran-5-carboxylic acid (CAS 860183-31-9)
- 6-Chlorobenzofuran-7-carboxylic acid (CAS 379230-47-4)
- (6-Chlorobenzofuran-2-yl)boronic acid (CAS 1851286-70-8)
- (5-Chlorobenzofuran-2-yl)boronic acid (CAS 223576-64-5)
- 1-(5-Chlorobenzofuran-2-yl)ethan-1-amine (CAS 147724-81-0)
Recommended Standards
- 5-Chlorobenzo[d]oxazole-2-carbaldehyde oxime (CAS 27412-06-2)
- 5-Chloropyrrolo[1,2-c]pyrimidine-3-carboxylic acid (CAS 2306268-87-9)
- 5-Chloro-4-methyl-2-nitrobenzonitrile (CAS 97113-40-1)
- 6-Chloro-1-benzofuran-2-carboxylic Acid (CAS 442125-04-4)
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- 4,4'-(4A,9a-dihydro-9H-fluorene-9,9-diyl)bis(2-methylphenol) (CAS 1025966-27-1)
- 2-((4-Chlorobenzo[d]thiazol-2-yl)(methyl)amino)-N-(5-methylisoxazol-3-yl)acetamide (CAS 1396748-09-6)
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