Octaphenylcyclotetrasiloxane
- CAS NO.：546-56-5
- Empirical Formula: C48H40O4Si4
- Molecular Weight: 793.18
- MDL number: MFCD00003268
- EINECS: 208-904-9
- SAFETY DATA SHEET (SDS)
- Update Date: 2023-12-26 11:30:52
What is Octaphenylcyclotetrasiloxane?
Chemical properties
Octaphenylcyclotetrasiloxane (OPCTS) is a white solid. It can be used for synthesizing pharmaceutical intermediates and organic silicone intermediates, especially for high temperature resistant phenyl silicone oil and other polymers.
Preparation
Octaphenylcyclotetrasiloxane is typically produced industrially by one of two processes: 1) the hydrolysis of diphenyldichlorosilane or 2) the hydrolysis of diphenyldialkoxysilanes.
Process the production of octaphenylcyclotetrasiloxane
Flammability and Explosibility
Not classified
Purification Methods
Recrystallise it from AcOH, EtOAc, *C6H6 or *C6H6/EtOH. It forms two stable isomorphs and both forms, as well as the mixture, melt at 200-201o. There is a metastable form which melts at 187-189o. [Burkhard et al. J Am Chem Soc 67 2174 1945, Hyde et al. J Am Chem Soc 69 488 1947, Beilstein 16 IV 1530.]
Properties of Octaphenylcyclotetrasiloxane
| Melting point: | 196-198 °C(lit.) |
| Boiling point: | 334 °C |
| Density | 1.185 |
| vapor pressure | 0Pa at 25℃ |
| refractive index | 1.62 |
| Flash point: | 200 °C |
| solubility | very faint turbidity in Toluene |
| form | solid |
| Specific Gravity | 1.185 |
| color | White to Almost white |
| Water Solubility | insoluble |
| Hydrolytic Sensitivity | 1: no significant reaction with aqueous systems |
| BRN | 2320758 |
| CAS DataBase Reference | 546-56-5(CAS DataBase Reference) |
| NIST Chemistry Reference | Octaphenylcyclotetrasiloxane(546-56-5) |
| EPA Substance Registry System | Cyclotetrasiloxane, octaphenyl- (546-56-5) |
Safety information for Octaphenylcyclotetrasiloxane
| Signal word | Warning |
| Pictogram(s) |
 Exclamation Mark Irritant GHS07 |
| GHS Hazard Statements |
H302:Acute toxicity,oral |
| Precautionary Statement Codes |
P280:Wear protective gloves/protective clothing/eye protection/face protection. P305+P351+P338:IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing. |
Computed Descriptors for Octaphenylcyclotetrasiloxane
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