2,4,6,8-Tetravinyl-2,4,6,8-tetramethylcyclotetrasiloxane
Synonym(s):2,4,6,8-Tetraethenyl-2,4,6,8-tetramethylcyclotetrasiloxane
- CAS NO.:2554-06-5
- Empirical Formula: C12H24O4Si4
- Molecular Weight: 344.66
- MDL number: MFCD00040293
- EINECS: 219-863-1
- SAFETY DATA SHEET (SDS)
- Update Date: 2024-08-28 18:16:09
What is 2,4,6,8-Tetravinyl-2,4,6,8-tetramethylcyclotetrasiloxane ?
Chemical properties
Colorless transparent liquid
Physical properties
bp 224–224.5 °C.
The Uses of 2,4,6,8-Tetravinyl-2,4,6,8-tetramethylcyclotetrasiloxane
2,4,6,8-Tetraethenyl-2,4,6,8-tetramethylcyclotetrasiloxane (1) (D4V) and the trimer, 2,4,6-triethenyl-2,4,6- trimethylcyclotrisiloxane (2) (D3V) are the two commercially available cyclic polyvinylmethylsiloxanes. D4 V is used as a vinyl donor in the palladium-catalyzed vinylation of aryl halides and as a building block in polymer chemistry and dendrimer synthesis. The palladium-catalyzed vinylation of substituted aryl halides using D4 V is a general and mild method for the preparation of a variety of substituted styrenes or dienes.It is widely used as reagent for the vinylation of aryl halides and building block for carbosilane dendrimers.
The Uses of 2,4,6,8-Tetravinyl-2,4,6,8-tetramethylcyclotetrasiloxane
2,4,6,8-Tetramethyl-2,4,6,8-tetravinylcyclotetrasiloxane is used as an intermediate in organic synthesis. It is used in the preparation of 4-vinyl-benzoic acid ethyl ester. Further, it is used to prepare styrene derivatives by cross-coupling with aryl bromide in the presence of palladium catalyst.
General Description
In the presence of a Pd catalyst, this reagent cross-couples with aryl bromides to give styrene derivatives.
Hazard
Low toxicity by ingestion and inhalation.
Flammability and Explosibility
Non flammable
Purification Methods
A 7mL sample can be distilled in a small Vigreux column (p 11) at atmospheric pressure without polymerisation or decomposition. It is soluble in cyclohexane. [Kantor et al. J Am Chem Soc 77 1685 1955, Beilstein 4 IV 4184.]
Properties of 2,4,6,8-Tetravinyl-2,4,6,8-tetramethylcyclotetrasiloxane
Melting point: | −44 °C (dec.)(lit.) |
Boiling point: | 111-112 °C10 mm Hg(lit.) |
Density | 0.997 g/mL at 25 °C(lit.) |
vapor pressure | 93.5Pa at 25℃ |
refractive index | n |
Flash point: | 210 °F |
storage temp. | Keep in dark place,Sealed in dry,Room Temperature |
solubility | Miscible with most organic solvents. |
form | liquid |
color | Colorless to Almost colorless |
Specific Gravity | 0.998 |
Water Solubility | 7μg/L at 23℃ |
Hydrolytic Sensitivity | 4: no reaction with water under neutral conditions |
BRN | 1807272 |
CAS DataBase Reference | 2554-06-5(CAS DataBase Reference) |
NIST Chemistry Reference | 2,4,6,8-Tetravinyl-2,4,6,8-tetramethylcyclotetrasiloxane(2554-06-5) |
EPA Substance Registry System | Cyclotetrasiloxane, 2,4,6,8-tetraethenyl-2,4,6,8-tetramethyl- (2554-06-5) |
Safety information for 2,4,6,8-Tetravinyl-2,4,6,8-tetramethylcyclotetrasiloxane
Signal word | Warning |
Pictogram(s) |
Exclamation Mark Irritant GHS07 |
GHS Hazard Statements |
H319:Serious eye damage/eye irritation |
Precautionary Statement Codes |
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 2,4,6,8-Tetravinyl-2,4,6,8-tetramethylcyclotetrasiloxane
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