4',5'-Dichloro-3',6'-dihydroxy-2',7'-dimethoxy-3-oxo-3H-spiro[isobenzofuran-1,9'-xanthene]-6-carboxylic acid CAS 82855-40-1
| CAS No. | 82855-40-1 |
| Molecular Formula | C23H14Cl2O9 |
| Molecular Weight | 505.26 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Compared with other compounds in its class, the molecular weight of 505.26 g/mol gives 4',5'-Dichloro-3',6'-dihydroxy-2',7'-dimethoxy-3-oxo-3H-spiro[isobenzofuran-1,9'-xanthene]-6-carboxylic acid distinctive chromatographic separation conditions and mass-spectrometry parameter settings.
4',5'-Dichloro-3',6'-dihydroxy-2',7'-dimethoxy-3-oxo-3H-spiro[isobenzofuran-1,9'-xanthene]-6-carboxylic acid (CAS 82855-40-1), molecular formula C23H14Cl2O9 and molecular weight 505.26 g/mol, is a CATO reference standard with documented purity and traceability.
4',5'-Dichloro-3',6'-dihydroxy-2',7'-dimethoxy-3-oxo-3H-spiro[isobenzofuran-1,9'-xanthene]-6-carboxylic acid (C23H14Cl2O9) contains a flavonoid core, 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.
CATO manufactures 4',5'-Dichloro-3',6'-dihydroxy-2',7'-dimethoxy-3-oxo-3H-spiro[isobenzofuran-1,9'-xanthene]-6-carboxylic acid under ISO 17034:2016 accreditation with dual CNAS and ANAB accreditation. Each batch is characterized by orthogonal methods and supplied with a full Certificate of Analysis (COA), ensuring metrological traceability.
Physical & Chemical Properties
| Molecular Formula | C23H14Cl2O9 |
| Molecular Weight | 505.26 g/mol |
| Appearance | Pale yellow to yellow crystalline powder. (slight halide-like odor, low volatility) |
| Purity | 97%+ |
| Storage | Store at room temperature, protect from light, keep sealed and dry |
| 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) | 16.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1980 |
| Halogen Content | Cl-containing |
Related Dichloro Standards
- 4',5'-Dichloro-3',6'-dihydroxy-2',7'-dimethoxy-3-oxo-3H-spiro[isobenzofuran-1,9'-xanthene]-5-carboxylic acid (CAS 82855-39-8)
- 2,5-Dichloro-N-(9-styrylacridin-2-yl)benzenesulfonamide (CAS 88522-60-5)
- 2,4-Dichloro-N-(2-((2-((3-chloro-5-(trifluoromethyl)pyridin-2-yl)amino)ethyl)amino)pyridin-3-yl)benzamide (CAS 338772-73-9)
- 4-[(3,4-Dichloro-1-methyl-1H-pyrazol-5-yl)oxy]-N-tridecylbenzene-1-sulfonamide (CAS 318284-30-9)
- 1-(2,6-Dichloro-4-(trifluoromethyl)phenyl)-5-(3,4-dichlorophenyl)-4-(methylsulfonyl)-1H-pyrazole (CAS 400088-06-4)
- 2,4-Dichloro-N-(2-((2-((3-chloro-5-(trifluoromethyl)pyridin-2-yl)amino)ethyl)amino)phenyl)benzamide (CAS 338772-79-5)
- 1-(2,6-Dichloro-4-(perfluoropropan-2-yl)phenyl)-4-iodo-1h-pyrazole (CAS 2084123-37-3)
- 2-((2,5-Dichloro-N-phenylphenyl)sulfonamido)-N-(3-(trifluoromethyl)phenyl)acetamide (CAS 339103-16-1)
Recommended Standards
- Delafloxacin impurity 37 (CAS CATO-C4X-263737)
- N-(4-bromophenyl)-3-((2,6-dichlorobenzyl)sulfonyl)thiophene-2-carboxamide (CAS 251097-58-2)
- 3-((4-Bromobenzyl)thio)-5-(((2,6-dichlorobenzyl)sulfinyl)methyl)-4-methyl-4H-1,2,4-triazole (CAS 344273-24-1)
- 1-(2,4-Dichlorophenyl)-5-(3,4-dichlorophenyl)-N-(3,5-dimethylphenyl)-1H-pyrazole-3-carboxamide (CAS 477713-21-6)
- 2-Ethynyl-6-methoxypyridin-4-amine (CAS 1824296-22-1)
- 7-Bromobenzofuran-5-ol (CAS 603311-31-5)
- 1-(4-Chlorophenyl)pent-4-en-1-ol (CAS 102058-50-4)
- Despropyl Disopyramide oxalate (CAS 1216619-15-6)
- 6-Chloro-3'-(pyrrolidin-1-ylsulfonyl)-[1,1'-biphenyl]-3-carboxylic acid (CAS 1261899-53-9)
- 4-(2-Methoxy-5-methylphenyl)butanoic acid (CAS 58404-64-1)
- 2-(cyclopentyloxy)-4-propoxybenzoic acid (CAS 1154275-43-0)
- Racecadotril Impurity 10 (CAS CATO-C4X-110610)
- Tert-butyl 2-(thiophen-3-yl)pyrrolidine-1-carboxylate (CAS 1355177-76-2)
- Semaglutide Impurity 160 (x TFA Salt) (CAS CATO-C4X-2226160)
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