9,9’-Spirobi[fluorene]-4-boronic Acid CAS 1421789-05-0
| CAS No. | 1421789-05-0 |
| Molecular Formula | C25H17BO2 |
| Molecular Weight | 360.21 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
9,9’-Spirobi[fluorene]-4-boronic Acid (CAS 1421789-05-0), molecular formula C25H17BO2 and molecular weight 360.21 g/mol, is a CATO reference standard with documented purity and traceability.
Structurally, 9,9’-Spirobi[fluorene]-4-boronic Acid (C25H17BO2) contains a steroid core, a hydroxyl group, an ether linkage. The molecule exhibits a degree of unsaturation (DBE) of 17.5, corresponding to approximately 17 ring(s) or double-bond equivalent(s). With a molecular weight of 360.21 g/mol, it falls into the moderately-high-molecular-weight range. The high carbon-to-hydrogen ratio imparts good lipophilicity, allowing liquid-liquid extraction with non-polar solvents such as n-hexane or ethyl acetate.
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 | C25H17BO2 |
| Molecular Weight | 360.21 g/mol |
| Appearance | Pale yellow to yellow crystalline powder |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light |
| Solubility (reference) | Soluble in chloroform, dichloromethane, ethyl acetate, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 17.5 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1991 |
Related Spirobi Standards
- 9,9'-Spirobi[fluoren]-3-ylboronic acid (CAS 1421789-04-9)
- 77-08-7 1,1'-Spirobi(indan)-5,5',6,6'-tetrol, 3,3,3',3'-tetramethyl- (8CI) 1,1'-Spirobi(1H-indene)-5,5',6,6'-tetrol, 2,2',3,3'-tetrahydro-3,3,3',3'-tetramethyl- 1,1'-Spirobi(1H-inden)-5,5',6,6'-tetrol, 2,2',3,3'-tetrahydro-3,3,3',3'-tetramethyl- 2,2',3,3'-Tetrahydro-3,3,3',3'-tetramethyl-1,1'-spirobi(1H-indene)-5,5',6,6'-tetrol AI3-16787 EINECS 201-003-1 NSC 512922 1,1'-Spirobi(indane-5,6-diol), 3,3,3',3'-tetramethyl- TTS 5 AI 3-16787 (CAS 77-08-7)
- 9,9'-Spirobi[fluorene]-2,2'-diamine (CAS 67665-45-6)
- 9,9'-Spirobi[fluorene]-3,3',6,6'-tetraamine (CAS 622011-41-0)
- 9,9'-Spirobi[9H-9-silafluorene] (CAS 159-68-2)
- 9,9'-Spirobi[9H-fluoren]-2-amine (CAS 118951-68-1)
- 9,9'-Spirobi[fluoren]-4-amine (CAS 1579281-06-3)
- 1,1'-(9,9'-Spirobi[fluorene]-2,2'-diyl)diethanone (CAS 22824-83-5)
Recommended Standards
- N-(3-Bromophenyl)-6,7-dimethoxyquinazolin-4-amine (CAS 153436-54-5)
- tert-Butyl (6-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)benzo[d]oxazol-2-yl)carbamate (CAS 1404480-24-5)
- 5-(3-Bromo-4-((4-methylbenzyl)oxy)phenyl)-1,3,4-oxadiazol-2-amine (CAS 1706453-74-8)
- 2-Bromo-5-methoxy-N-(pyrazolo[1,5-a]pyridin-3-ylmethyl)benzamide (CAS 1396854-81-1)
- 3-(3,4-Dichlorobenzyl)-2,2-dimethyl-2,3-dihydroquinazolin-4(1H)-one (CAS 866043-33-6)
- 5-Bromo-2-methyl-1,2-dihydroisoquinolin-1-one (CAS 1367905-79-0)
- 2-Ethyl-6-oxo-1,6-dihydropyrimidine-4-carboxylic acid (CAS 1267654-20-5)
- 4-Bromo-3,5-difluoroanisole (CAS 202865-61-0)
- 2-Chloro-4-iodo-1-(trifluoromethoxy)benzene (CAS 1198422-69-3)
- 3-(5-Bromo-3-methyl-1H-pyrazolo[3,4-b]pyridin-1-yl)tetrahydrothiophene 1,1-dioxide (CAS 1016857-76-3)
- 1-(6-Amino-1,4,4a,9a-tetrahydrobenzofuro[2,3-c]pyridin-2(3H)-yl)ethanone (CAS 1363405-89-3)
- 3-Bromo-2-(3,3-difluoropiperidin-1-yl)benzonitrile 1774896-17-1 (CAS 1774896-17-1)
- 5-(3-Chlorophenyl)-3-(naphthalen-2-yl)-1-phenyl-4,5-dihydro-1H-pyrazole (CAS 329779-78-4)
- Tirzepatide Impurity 15 (CAS CATO-C4X-324015)
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