2’-Bromo-2,7-di-tert-butyl-9,9’-spirobi[fluorene] CAS 393841-81-1
| CAS No. | 393841-81-1 |
| Molecular Formula | C33H31Br |
| Molecular Weight | 507.50 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Compared with other compounds in its class, the molecular weight of 507.50 g/mol gives 2’-Bromo-2,7-di-tert-butyl-9,9’-spirobi[fluorene] distinctive chromatographic separation conditions and mass-spectrometry parameter settings.
CATO supplies 2’-Bromo-2,7-di-tert-butyl-9,9’-spirobi[fluorene] (CAS 393841-81-1), a certified reference material (molecular formula C33H31Br, MW 507.50 g/mol) for analytical method development and quality control.
Owing to bromine substitution, a polycyclic aromatic system, 2’-Bromo-2,7-di-tert-butyl-9,9’-spirobi[fluorene] is typically pale yellow to yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 507.50 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.
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 | C33H31Br |
| Molecular Weight | 507.50 g/mol |
| Appearance | Pale yellow to yellow crystalline powder. (slight halide-like odor) |
| Purity | 97%+ |
| Storage | Store at room temperature, 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) | 18.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 2025 |
| Halogen Content | Br-containing |
Related Bromo Standards
- 4'-Bromo-2,7-di-tert-butyl-9,9'-spirobi[fluorene] (CAS 1365480-13-2)
- 5-Bromo-3-iodo-1-(phenylsulfonyl)-1H-pyrrolo-[2,3-b]pyridine-2-carboxylic acid (CAS 1299607-75-2)
- 5-Bromo-N-(2,2,2-trichloro-1-(3-(2-chlorophenyl)thioureido)ethyl)furan-2-carboxamide (CAS 303062-06-8)
- 1-(3-(6-Bromo-7-(difluoromethyl)-3,4-dihydroquinolin-1(2H)-yl)-1-(tetrahydro-2H-pyran-4-yl)-1,4,6,7-tetrahydro-5H-pyrazolo[4,3-c]pyridin-5-yl)ethan-1-one (CAS 1936429-30-9)
- (11R)-16-bromo-5,11,26-trimethyl-7-oxa-4,5,13,20,22,27-hexaazapentacyclo[22.3.1.0²,⁶.0¹³,²¹.0¹⁴,¹⁹]octacosa-1(28),2(6),3,14,16,18,21,24,26-nonaen-23-one (CAS 2573869-16-4)
- 2-Bromo-9,10-di(1-naphthyl)anthracene (CAS 929031-39-0)
- 2-Bromo-9,10-di(2-naphthyl)anthracene (CAS 474688-76-1)
- 7-Bromo Darifenacin (CAS 1391080-43-5)
Recommended Standards
- Silodosin Impurity 18 (CAS 1384966-05-5)
- N-(9-((2R,3R,4R,5R)-4-Hydroxy-5-(hydroxymethyl)-3-((4-methoxybenzyl)oxy)tetrahydrofuran-2-yl)-6-oxo-6,9-dihydro-1H-purin-2-yl)benzamide (CAS 80015-56-1)
- Apixaban Impurity 136 (CAS CATO-C4X-1088136)
- 7-Cyanomethotrexate Dimethyl Ester (CAS 112163-39-0)
- 4-Chloro-2-methyl-5-((2-(pyridin-2-yl)ethyl)amino)pyridazin-3(2h)-one (CAS 1209881-00-4)
- 2-(4-Chloro-5-fluoro-3-methylpyridin-2-yl)-2-cyclopropylacetonitrile (CAS 169749-86-4)
- 5-Methyltetrahydrofuran-3-carboxylic acid (CAS 1797225-93-4)
- Rebamipide impurity 17 (CAS CATO-C4X-152317)
- N-benzyl-2-methyl-5-oxo-5H-chromeno[2,3-b]pyridine-3-carboxamide (CAS 338417-60-0)
- D-Mannopyranoside A (CAS 65446-24-4)
- (R)-4-(4-Hydroxyphenyl)-4-methyloxazolidin-2-one (CAS 1246973-50-1)
- 5-chloro-2-(2-methoxyethoxy)benzene-1-sulfonamide (CAS 111762-24-4)
- Ticagrelor impurity 159 (CAS 1511636-19-3)
- 59880-97-6 Chemotactic peptide F-Met-Leu-Phe L-Phenylalanine, N-(N-(N-formyl-L-methionyl)-L-leucyl)- N-Formyl-L-methionyl-L-leucyl-L-phenylalanine N-Formyl-Met-Leu-Phe N-Formylmethionine leucyl-phenylalanine fMLF fMLP (misnomer but widely used) (CAS 59880-97-6)
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