9,9'-Spirobi[9H-9-silafluorene] CAS 159-68-2
| CAS No. | 159-68-2 |
| Molecular Formula | C24H16Si |
| Molecular Weight | 332.47 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Under current pharmacopoeial and regulatory frameworks, quality-control requirements for this class of reference material explicitly involve the control of targets including 9,9'-Spirobi[9H-9-silafluorene].
9,9'-Spirobi[9H-9-silafluorene] (CAS 159-68-2), molecular formula C24H16Si and molecular weight 332.47 g/mol, is a CATO reference standard with documented purity and traceability.
Owing to a polycyclic aromatic system, 9,9'-Spirobi[9H-9-silafluorene] is typically pale yellow to yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 332.47 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.
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
As a certified reference material (CRM), 9,9'-Spirobi[9H-9-silafluorene] 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 | C24H16Si |
| Molecular Weight | 332.47 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 |
| Stability | Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 17.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1957 |
Related Spirobi Standards
- 9,9'-Spirobi[9H-fluoren]-2-amine (CAS 118951-68-1)
- 9,9'-Spirobi[fluoren]-4-amine (CAS 1579281-06-3)
- 9,9'-Spirobi[fluorene]-2,2'-diamine (CAS 67665-45-6)
- 9,9’-Spirobi[9H-fluorene] (CAS 159-66-0)
- 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[fluoren]-3-ylboronic acid (CAS 1421789-04-9)
- 9,9’-Spirobi[fluorene]-4-boronic Acid (CAS 1421789-05-0)
- 9,9'-Spirobi[fluorene]-3,3',6,6'-tetraamine (CAS 622011-41-0)
Recommended Standards
- trans,trans-4'-(3-Butenyl)-4-(3,4-difluorophenyl)bicyclohexyl (CAS 155266-68-5)
- 4-Amino-6-(difluoromethyl)-5-iodonicotinoyl chloride (CAS 1803673-90-6)
- Tert-butyl 5-((trimethylsilyl)ethynyl)-2,3-dihydro-1H-pyrido[3,4-b][1,4]oxazine-1-carboxylate (CAS 1203499-24-4)
- 4-Amino-2-(difluoromethyl)-6-iodonicotinoyl chloride (CAS 1805970-18-6)
- (3-Amino-5-cyanophenyl)boronic acid (CAS 913943-05-2)
- (S)-2,2'-Bis(diphenylphosphino)-4,4',6,6'-tetramethoxy)-1,1'-biphenyl (CAS 1365531-76-5)
- 2-Bromo-1,4-dimethyl-3-nitrobenzene (CAS 52415-02-8)
- 2-Butoxy-5-fluorobenzoyl chloride (CAS 1443328-56-0)
- 1-[3-(2-Methoxy-4-nitrophenoxy)propyl]piperidine hydrochloride (CAS 97598-72-6)
- 2-(Piperidin-3-yloxy)pyridine hydrochloride (CAS 1185310-55-7)
- {[5-(2-thienylmethyl)-1,2,4-oxadiazol-3-yl]methyl}amine hydrochloride (CAS 1609395-80-3)
- 8-Bromo-6-fluoro-3,4-dihydrobenzo[f][1,4]oxazepin-5(2H)-one (CAS 1962125-90-1)
- Ilaprazole Impurity 235 (CAS CATO-C4X-1130235)
- Des-Pro-Pro-Tirzepatide (CAS CATO-CPTD788696)
Why CATO?
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