9-(Bromo(phenyl)methylene)-9H-fluorene CAS 33735-95-4
| CAS No. | 33735-95-4 |
| Molecular Formula | C20H13Br |
| Molecular Weight | 333.22 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
9-(Bromo(phenyl)methylene)-9H-fluorene (CAS 33735-95-4) is a high-purity analytical reference standard with the molecular formula C20H13Br and a molecular weight of 333.22 g/mol.
Owing to bromine substitution, a polycyclic aromatic system, 9-(Bromo(phenyl)methylene)-9H-fluorene is typically pale yellow to yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 333.22 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.
As a certified reference material (CRM), 9-(Bromo(phenyl)methylene)-9H-fluorene 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 | C20H13Br |
| Molecular Weight | 333.22 g/mol |
| Appearance | Pale yellow to yellow crystalline powder. (slight halide-like odor) |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light |
| Solubility (reference) | Soluble in chloroform, dichloromethane, ethyl acetate |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 14.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1966 |
| Halogen Content | Br-containing |
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Recommended Standards
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- 3-[7-(thiophen-2-yl)-[1,2,4]triazolo[1,5-a]pyrimidin-2-yl]propanoic acid (CAS 1018052-13-5)
- Pelabresib (CPI-0610) (CAS 1380087-89-7)
- 1-(2-Bromo-5-chlorophenyl)piperazine (CAS 1538703-71-7)
- 1-(Dimethylamino)cyclopentane-1-carboxylic acid (CAS 933690-12-1)
- Ethyl 4-amino-6-chloropyridazine-3-carboxylate (CAS 1822984-03-1)
- 4-(Dimethylamino)-3-fluorobenzoic acid hydrochloride (CAS 1197839-02-3)
- Semaglutide impurity 45 (CAS CATO-C4X-222645)
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