2,4,6,8-Tetramethyl-2,4,6,8-tetravinylcyclotetrasiloxan

Bezeichnung:2,4,6,8-Tetramethyl-2,4,6,8-tetravinylcyclotetrasiloxan

CAS-Nr2554-06-5

Englisch Name:2,4,6,8-Tetravinyl-2,4,6,8-tetramethylcyclotetrasiloxane

CBNumberCB9446902

SummenformelC12H24O4Si4

Molgewicht344.66

MOL-Datei2554-06-5.mol

Synonyma

2,4,6,8-Tetramethyl-2,4,6,8-tetravinylcyclotetrasiloxan

2,4,6,8-Tetramethyl-2,4,6,8-tetravinylcyclotetrasiloxan physikalisch-chemischer Eigenschaften

Schmelzpunkt	−44 °C (dec.)(lit.)
Siedepunkt	111-112 °C10 mm Hg(lit.)
Dichte	0.997 g/mL at 25 °C(lit.)
Dampfdruck	93.5Pa at 25℃
Brechungsindex	n20/D 1.435
Flammpunkt	210 °F
storage temp.	Keep in dark place,Sealed in dry,Room Temperature
Löslichkeit	Miscible with most organic solvents.
Aggregatzustand	liquid
Wichte	0.998
Farbe	Colorless to Almost colorless
Wasserlöslichkeit	7μg/L at 23℃
Hydrolytic Sensitivity	4: no reaction with water under neutral conditions
BRN	1807272
LogP	6.47
CAS Datenbank	2554-06-5(CAS DataBase Reference)
NIST chemische Informationen	2,4,6,8-Tetravinyl-2,4,6,8-tetramethylcyclotetrasiloxane(2554-06-5)
EPA chemische Informationen	Cyclotetrasiloxane, 2,4,6,8-tetraethenyl-2,4,6,8-tetramethyl- (2554-06-5)

Sicherheit

Kennzeichnung gefährlicher	Xi
R-Sätze:	36
S-Sätze:	26-36
WGK Germany	1
RTECS-Nr.	GZ4550000
F	10
TSCA	Yes
HS Code	29319090

Gefahreninformationscode (GHS)

2,4,6,8-Tetravinyl-2,4,6,8-tetramethylcyclotetrasiloxane Chemische Eigenschaften,Einsatz,Produktion Methoden

R-Sätze Betriebsanweisung:
R36:Reizt die Augen.
S-Sätze Betriebsanweisung:
S26:Bei Berührung mit den Augen sofort gründlich mit Wasser abspülen und Arzt konsultieren.
S36:DE: Bei der Arbeit geeignete Schutzkleidung tragen.
Chemische Eigenschaften
Colorless transparent liquid
Physikalische Eigenschaften
bp 224–224.5 °C.
Verwenden
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.
Verwenden
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.
Allgemeine Beschreibung
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
läuterung methode
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.]

2,4,6,8-Tetramethyl-2,4,6,8-tetravinylcyclotetrasiloxan Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

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