1,1,3,3-Tetramethyldisiloxan

Bezeichnung:1,1,3,3-Tetramethyldisiloxan

CAS-Nr3277-26-7

Englisch Name:1,1,3,3-Tetramethyldisiloxane

CBNumberCB5355451

SummenformelC4H14OSi2

Molgewicht134.32

MOL-Datei3277-26-7.mol

Synonyma

1,1,3,3-Tetramethyldisiloxan

1,1,3,3-Tetramethyldisiloxan physikalisch-chemischer Eigenschaften

Schmelzpunkt	<-78°C
Siedepunkt	70-71 °C (lit.)
Dichte	0.76 g/mL at 25 °C (lit.)
Dampfdruck	250 hPa (20 °C)
Brechungsindex	n20/D 1.370(lit.)
Flammpunkt	14 °F
storage temp.	Store at <= 20°C.
Löslichkeit	soluble in Chloroform
Aggregatzustand	liquid
pka	11.9[at 20 ℃]
Farbe	colorless
Wichte	0.757
Explosionsgrenze	0.8-62.9%(V)
Wasserlöslichkeit	DECOMPOSES
Sensitive	Moisture Sensitive
Hydrolytic Sensitivity	3: reacts with aqueous base
BRN	1733364
InChI	1S/C4H14OSi2/c1-6(2)5-7(3)4/h6-7H,1-4H3
InChIKey	NVYQDQZEMGUESH-UHFFFAOYSA-N
SMILES	C[SiH](C)O[SiH](C)C
LogP	-0.38-4.5 at 20-25℃
CAS Datenbank	3277-26-7(CAS DataBase Reference)
NIST chemische Informationen	((CH3)2SiH)2O(3277-26-7)
EPA chemische Informationen	Disiloxane, 1,1,3,3-tetramethyl- (3277-26-7)

Sicherheit

Kennzeichnung gefährlicher	F
R-Sätze:	11-36/37/38-16
S-Sätze:	16-26-36-9-33-29
RIDADR	UN 2924 3/PG 2
WGK Germany	3
RTECS-Nr.	JN1000000
F	10-21
Selbstentzündungstemperatur	240 °C
TSCA	TSCA listed
HazardClass	3
PackingGroup	II
HS Code	29310095
Speicherklasse	3 - Flammable liquids
Hazard Classifications	Flam. Liq. 2

Gefahreninformationscode (GHS)

1,1,3,3-Tetramethyldisiloxane Chemische Eigenschaften,Einsatz,Produktion Methoden

R-Sätze Betriebsanweisung:
R11:Leichtentzündlich.
R36/37/38:Reizt die Augen, die Atmungsorgane und die Haut.
R16:Explosionsgefährlich in Mischung mit brandfördernden Stoffen.
S-Sätze Betriebsanweisung:
S16:Von Zündquellen fernhalten - Nicht rauchen.
S26:Bei Berührung mit den Augen sofort gründlich mit Wasser abspülen und Arzt konsultieren.
S36:DE: Bei der Arbeit geeignete Schutzkleidung tragen.
S9:Behälter an einem gut gelüfteten Ort aufbewahren.
S33:Maßnahmen gegen elektrostatische Aufladungen treffen.
S29:Nicht in die Kanalisation gelangen lassen.
Beschreibung
1,1,3,3-Tetramethyldisiloxane is soluble in many organic solvents, such as aromatic hydrocarbon and petroleum hydrocarbons, and so on. This product is a kind of widely used organic silicon intermediates, and usually be used as organic silicon blocking agent. Due to containing reactive Si-H groups in the molecular structure, it can be used in the synthesis of copolymer macromolecule by hydrosilylation. The synthesis of copolymer macromolecule can be made into a series of reactive silicone oil.
Chemische Eigenschaften
Colorless or yellowish transparent liquid
Verwenden
1. Synthesis of polysiloxane containing faculties end groups.
2. Can be used for the preparation of high performance organic silicone surfactants.
3. Applicable to the production of many products, such as addition silicon rubber, silica gel, Hydrogenpolysiloxane and plastic, resin modifier, dendrite polymer special additives, etc.
Verwenden
1,1,3,3-Tetramethyldisiloxane is used as a monomer in the production of silicone polymers or silicone resins. It is used as a precursor to prepare other organosilicon compounds. It is also utilized in non-aqueous polymer preparation as well as a laboratory reagent.
Application
1, 1, 3, 3-Tetramethyldisiloxane is a kind of siloxane derivative, and can be used as a monomer for the preparation of silicone polymers or silicone resins. It is used as an intermediate for preparing other organosilicon compounds. It is also used in non-aqueous polymer preparation as well as a laboratory reagent. In organic synthesis, it finds an application as an effective reducing agent in platinum-catalyzed reduction of carboxamides to amines as well as in the Au/TiO2-catalyzed hydrosilylation of carbonyl compounds (e.g., reduction of aldehydes or ketones) relative to monohydrosilanes. It can also enable a direct bromination of carboxylic acids in the presence of indium bromide (InBr3) as catalyst.
Flammability and Explosibility
Highly flammable
reaction suitability
reagent type: reductant
läuterung methode
1,Possible impurity is 1,1,5,5-tetramethyl-3-trimethylsiloxytrisiloxane b 154-155o/733mm. Fractionate it, collect fractions boiling below 80o and re-fractionate it. Its purity can be analysed by alkaline hydrolysis and measuring the volume of H2 liberated followed by gravimetric estimation of silica in the hydrolysate. It is unchanged when stored in glass containers in the absence of moisture for 2-3 weeks. Small amounts of H2 are liberated on long storage. Care should be taken when opening a container due to pressure developed. [Speier et al. J Am Chem Soc 79 974 1958, Emeléus & Smythe J Chem Soc 609 1958, IR: Kriegsmann Z Anorg Chem 299 78 1959, Beilstein 4 IV 3991.]
Toxicity evaluation
1,1,3,3-Tetramethyldisiloxane is irritating to the eyes and upper respiratory tract. Ingestion can be fatal.
Filter für giftige stoffe
The ITSL for tetramethyldihydrogendisiloxane is being established at this time as 120 μg/m3 with annual averaging.
Einzelnachweise
https://www.alfa.com/en/catalog/B23697/
http://www.organic-chemistry.org/chemicals/reductions/tetramethyldisiloxane-TMDSO.shtm
https://www.infona.pl/resource/bwmeta1.element.elsevier-722236cc-df38-37aa-bbed-029ec07d525f

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