2-(2,4,5,7-Tetrabromo-6-hydroxy-3-oxo-3H-xanthen-9-yl)benzoic acid CAS 152-75-0
| CAS No. | 152-75-0 |
| Molecular Formula | C20H8Br4O5 |
| Molecular Weight | 647.89 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
2-(2,4,5,7-Tetrabromo-6-hydroxy-3-oxo-3H-xanthen-9-yl)benzoic acid (CAS 152-75-0), molecular formula C20H8Br4O5 and molecular weight 647.89 g/mol, is a CATO reference standard with documented purity and traceability.
Owing to a flavonoid core, a hydroxyl group, an ether linkage, bromine substitution, 2-(2,4,5,7-Tetrabromo-6-hydroxy-3-oxo-3H-xanthen-9-yl)benzoic acid is typically pale yellow to yellow amorphous powder. Its solid-state physicochemical attributes — including a molecular weight of 647.89 g/mol — guide the selection of appropriate sample preparation and analytical techniques. Halogen substitution (F/Cl/Br/I) produces a distinctive isotope pattern in mass spectrometry, a valuable aid for qualitative confirmation.
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.
As a certified reference material (CRM), 2-(2,4,5,7-Tetrabromo-6-hydroxy-3-oxo-3H-xanthen-9-yl)benzoic acid meets the metrological traceability requirements of ISO/IEC 17025 laboratories. Batch-to-batch consistency is monitored via control charts to guarantee comparable assigned values across lots.
Physical & Chemical Properties
| Molecular Formula | C20H8Br4O5 |
| Molecular Weight | 647.89 g/mol |
| 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) | 15.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1957 |
| Halogen Content | Br-containing |
Related Tetrabromo Standards
- 3,3',6,6'-Tetrabromo-9,9'-bicarbazole (CAS 18628-03-0)
- 2,2',7,7'-Tetrabromo-9,9'-bifluorenylidene (CAS 27192-91-2)
- 1,2,3,5-Tetrabromo-4-(2,5-dibromophenoxy)benzene (CAS 446255-00-1)
- 4,5,6,7-Tetrabromo-3,3-bis(4-hydroxyphenyl)isobenzofuran-1(3H)-one (CAS 13027-28-6)
- 2,2,7,7-Tetrabromo-9,9-spirobifluorene (CAS 128055-74-3)
- 2,3,13,14-Tetrabromo-6,7,9,10,17,18-hexahydrodibenzo[b,h][1,4,7,10,13]penta (CAS 302929-47-1)
- 2,3,13,14-Tetrabromo-6,7,9,10,17,18,20,21-octahydrodibenzo[b,k][1,4,7,10,13,16]hexaoxacyclooctadecine (CAS 40100-11-6)
- 2',4',5',7'-Tetrabromo-3',6'-dihydroxy-3-oxo-3H-spiro[isobenzofuran-1,9'-xanthene]-6-carboxylic acid (CAS 3561-24-8)
Recommended Standards
- Lonafarnib D9 (CAS 1197367-02-4)
- bromoeosin (CAS 15086-94-9)
- 4,8-Bis(4-chloro-5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b:4,5-b']dithiophene (CAS 2237223-05-9)
- Strontium di[bis(trifluoromethylsulfonylimide)] (CAS 862121-57-1)
- 4-Methoxy-N-(3-methylbutan-2-yl)aniline (CAS 293743-26-7)
- N-(4-Chlorophenyl)-2,2-dimethylhydrazinecarboxamide (CAS 19102-30-8)
- Relebactam Impurity 131 (CAS CATO-C4X-2144131)
- 2-((6-Bromo-1H-imidazo[4,5-b]pyridin-2-yl)thio)-1-phenylethanone (CAS 93752-21-7)
- 3-Amino-3-(3,4-difluorophenyl)propan-1-ol (CAS 790227-21-3)
- O-Methyl-N-(9H-purin-6-yl)hydroxylamine (CAS 17124-24-2)
- Hydrogen (1-acetyl-2-oxopropyl)chloro(pentane-2,4-dionato-O,O')platinate (CAS 12129-03-2)
- Oclacitinib Impurity 20 (CAS 1312034-36-8)
- Bis([1,1'-biphenyl]-2-yloxy)methane (CAS 116374-06-2)
- Amyloid Precursor Frameshift Mutant C-Terminal Peptide trifluoroacetate salt (CAS 189125-14-2)
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