2,2'':7'',2''''-Ter-9,9'-spirobi[9H-fluorene] CAS 518997-91-6
| CAS No. | 518997-91-6 |
| Molecular Formula | C75H44 |
| Molecular Weight | 945.15 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Owing to a polycyclic aromatic system, 2,2'':7'',2''''-Ter-9,9'-spirobi[9H-fluorene] is typically pale yellow to yellow amorphous powder. Its solid-state physicochemical attributes — including a molecular weight of 945.15 g/mol — guide the selection of appropriate sample preparation and analytical techniques. The high carbon-to-hydrogen ratio imparts good lipophilicity, allowing liquid-liquid extraction with non-polar solvents such as n-hexane or ethyl acetate.
2,2'':7'',2''''-Ter-9,9'-spirobi[9H-fluorene] (CAS 518997-91-6), molecular formula C75H44 and molecular weight 945.15 g/mol, is a CATO reference standard with documented purity and traceability.
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
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 | C75H44 |
| Molecular Weight | 945.15 g/mol |
| Purity | 97%+ |
| Storage | Store at room temperature, protect from light |
| Solubility (reference) | Soluble in chloroform, dichloromethane, ethyl acetate |
| Stability | Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 54.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1984 |
Related Ter Standards
- 2-(9,9'-Spirobi[fluoren]-2-yl)-4,6-di([1,1':3',1''-terphenyl]-5'-yl)-1,3,5-triazine (CAS 1233200-52-6)
- 4,4',4",4"'-(9,9'-Spirobi[fluorene]-2,2',7,7'-tetrayl)tetrabenzoic acid (CAS 1350363-07-3)
- Di(9,9'-spirobi[fluoren]-2-yl)(phenyl)phosphine oxide (CAS 824426-27-9)
- 9,9′-Spirobi[9H-fluorene]-2,2′-diamine, N2,N2,N2′,N2′-tetrakis(4-methylphenyl)- (CAS 515833-76-8)
- 4,4''-Bi(9,9'-spirobi[fluorene]) (CAS 1161009-90-0)
- 9,9'-Spirobi[fluorene]-2,2'-diyldiboronic acid pinacol ester (CAS 676168-63-1)
- 2-(9,9'-Spirobi[fluoren]-2-yl)-4,6-diphenyl-1,3,5-triazine (CAS 1207176-84-8)
- 9,9'-Spirobi[fluoren]-2-yldiphenylphosphine oxide (CAS 1125547-88-7)
Recommended Standards
- Nepasaikosaponin K (CAS 405229-61-0)
- Raloxifene Dimer (CAS 618902-12-8)
- 5,6-Didehydroginsenoside Rd (CAS 1268459-68-2)
- Osimertinib Impurity 21 (CAS 2919324-15-3)
- 6-(Trifluoromethyl)pyridine-3-carboxylic Acid (CAS 231291-22-8)
- (R)-1,2-di([1,1'-biphenyl]-4-yl)-2-hydroxyethan-1-one (CAS 5623-25-6)
- 3-((((6-Methylpyridin-3-yl)methyl)amino)methyl)benzonitrile (CAS 1240946-95-5)
- Ritonavir Dehydro (CAS 1156504-13-0)
- 2,2-Difluoro-1-(4-Morpholinyl)-4-Penten-1-One (CAS 149229-28-7)
- 2,3,6,7,10,11-Hexakis[(n-octyl)oxy]triphenylene (CAS 70351-87-0)
- Methyl 2-Chloro-6-methoxynicotinate (CAS 95652-77-0)
- 1-((2,4-Dibromophenyl)sulfonyl)-3,5-dimethyl-1H-pyrazole (CAS 482280-30-8)
- 4-(Methylsulfonyl)cyclohexan-1-ol (CAS 21975-10-0)
- Insulin Degludec Impurity 12 (CAS CATO-C4X-215712)
Why CATO?
- ISO 17034 accredited reference material producer (CNAS + ANAB dual accreditation)
- 130,000+ catalog items in stock, COA supplied with every batch
- Worldwide shipping with full export documentation (HS code guidance available)
- Technical support: +86 18665070610 / Nicole.chen@cato-chem.com