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3277-26-7

Basic Information
CAS No.: 3277-26-7
Name: 1,1,3,3-Tetramethyldisiloxane
Article Data: 40
Cas Database
Molecular Structure:
Molecular Structure of 3277-26-7 (1,1,3,3-Tetramethyldisiloxane)
Formula: C4H14OSi2
Molecular Weight: 134.326
Synonyms: 1,1,3,3-Tetramethyl-1,3-dihydrodisiloxane;1,1,3,3-Tetramethyl-1,3-disiloxane;1,1,3,3-Tetramethyldisiloxane;1,3-Dihydrogen-1,1,3,3-tetramethyldisiloxane;1,3-Dihydrotetramethyldisiloxane;Bis(dimethylsilyl) ether;Bis(dimethylsilyl) oxide;Dimethylsilyl ether;LS7040;NSC 155369;T 2030;T 2030 (siloxane);sym-Tetramethyldisiloxane;
EINECS: 221-906-4
Density: 0.76 g/cm3
Melting Point: <-78oC
Boiling Point: 71 °C
Flash Point: -20 °C
Solubility: decomposes in water
Appearance: Colorless or yellowish transparent liquid
Hazard Symbols: FlammableF
Risk Codes: 11-36/37/38-16
Safety: 16-26-36-9-33-29
Transport Information: UN 2924 3/PG 2
PSA: 9.23000
LogP: 0.96980
Synthetic route
2401-73-2

1,1,3,3-tetramethyl-1,3-dichlorodisiloxane

3277-26-7

1,1,3,3-Tetramethyldisiloxane

Conditions
ConditionsYield
91%

dodecamethylcyclohexasilane

3277-26-7

1,1,3,3-Tetramethyldisiloxane

Conditions
ConditionsYield
With water In diethyl ether at 5℃; for 1.5h; Irradiation;85%
1066-35-9

dimethylmonochlorosilane

C48H120O44Si16

A

3277-26-7

1,1,3,3-Tetramethyldisiloxane

B

C48H168O44Si40

Conditions
ConditionsYield
With water In tetrahydrofuran for 0.5h; Cooling with ice;A n/a
B 82%
78-10-4

tetraethoxy orthosilicate

14857-34-2

dimethyl(ethoxy)silane

A

3277-26-7

1,1,3,3-Tetramethyldisiloxane

B

17082-47-2

tetrakis(dimethylsilyloxy)silane

Conditions
ConditionsYield
With water In benzene at 38 - 40℃; for 2h;A 19%
B 69%
75-54-7

Dichloromethylsilane

676-58-4

methylmagnesium chloride

3277-26-7

1,1,3,3-Tetramethyldisiloxane

Conditions
ConditionsYield
und Behandeln des Reaktionsprodukts mit H2O;
und Behandeln des Reaktionsprodukts mit H2O;
1066-35-9

dimethylmonochlorosilane

3277-26-7

1,1,3,3-Tetramethyldisiloxane

Conditions
ConditionsYield
With water
With hydrogenchloride; water at -10 - 50℃; for 4h;
1066-35-9

dimethylmonochlorosilane

A

3277-26-7

1,1,3,3-Tetramethyldisiloxane

B

17449-78-4

3-dimethylsilanyloxy-1,1,5,5-tetramethyl-trisiloxane

Conditions
ConditionsYield
With trichlorosilane Hydrolysis;
2441-21-6

iododimethylsilane

3277-26-7

1,1,3,3-Tetramethyldisiloxane

Conditions
ConditionsYield
With water for 0.333333h; Ambient temperature;0.185 g
1438-82-0

1,1,1,3,3-pentamethyl-1,3-disiloxane

A

3277-26-7

1,1,3,3-Tetramethyldisiloxane

B

107-46-0

Hexamethyldisiloxane

Conditions
ConditionsYield
KU-23 sulfonic cation exchanger at 12℃; Equilibrium constant;
36156-09-9

1-chloromethyl-1,1,3,3-tetramethyldisiloxane

A

3277-26-7

1,1,3,3-Tetramethyldisiloxane

B

2362-10-9

1,3-Bis(chloromethyl)-1,1,3,3-tetramethyldisiloxane

Conditions
ConditionsYield
KU-23 sulfonic cation-exchanger Equilibrium constant;
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    Chemical Name: 1 1 3-Tetramethyldisiloxane CAS No.: 3277-26-7 Molecular Fomula:C4H14OSi2 Chemical Structure: Molecular weight: 134.32 Appearance: cololess liquid Assay:99% Appearance:Colorless liquid Storage:Preserve in well-closed, ligh

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Specification

The IUPAC name of sym-Tetramethyldisiloxane is (dimethyl-λ3-silanyl)oxy-dimethylsilicon. With the CAS registry number 3277-26-7 and EINECS 221-906-4, it is also named as 1,1,3,3-Tetramethyldisiloxane. The product's categories are Industrial / Fine Chemicals; Reduction; Si (Classes of Silicon Compounds); Si-H Compounds; Siloxanes; Si-O Compounds; Synthetic Organic Chemistry; Reducing Agents; Organometallic Reagents; Organosilicon. It is colorless or yellowish transparent liquid which is sensitive to moisture. Additionally, this chemical should be sealed in the container and stored in the well-ventilated and dry place

The other characteristics of this product can be summarized as: (1)ACD/LogP: 4.55; (2)# of Rule of 5 Violations: 0; (3)ACD/LogD (pH 5.5): 4.55; (4)ACD/LogD (pH 7.4): 4.55; (5)ACD/BCF (pH 5.5): 1689.878; (6)ACD/BCF (pH 7.4): 1689.878; (7)ACD/KOC (pH 5.5): 7113.717; (8)ACD/KOC (pH 7.4): 7113.717; (9)#H bond acceptors: 1; (10)#H bond donors: 0; (11)#Freely Rotating Bonds: 2; (12)Polar Surface Area: 9.23 Å2; (13)Enthalpy of Vaporization: 29.935 kJ/mol; (14)Vapour Pressure: 138.393 mmHg at 25°C; (15)Rotatable Bond Count: 2 ; (16)Exact Mass: 132.042668 ; (17)MonoIsotopic Mass: 132.042668 ; (18)Topological Polar Surface Area: 9.2 ; (19)Heavy Atom Count: 7 ; (20)Complexity: 39.

Preparation and Uses of sym-Tetramethyldisiloxane: It can be obtained by hydrolysis of dimethylchlorosilane. It is used in the production of additional silicone rubber, silicone gel, methyl hydrogen silicone oil, and other specialty additives.

When you are using this chemical, please be cautious about it as the following:
It is highly flammable, so people should keep it away from sources of ignition. It can be explosive when mixed with oxidizing substances. What's more, it is irritating to eyes, respiratory system and skin. In case of contacting with eyes, rinse immediately with plenty of water and seek medical advice. After using it, take precautionary measures against static discharges. If you want to contact this product, you must wear suitable protective clothing. 

People can use the following data to convert to the molecule structure. 
1. SMILES:C[SiH](C)O[SiH](C)C
2. InChI:InChI=1/C4H14OSi2/c1-6(2)5-7(3)4/h6-7H,1-4H3 
3. InChIKey:NVYQDQZEMGUESH-UHFFFAOYAY

The following are the toxicity data which has been tested.

Organism Test Type Route Reported Dose (Normalized Dose) Effect Source
mouse LC50 inhalation 400gm/m3/2H (400000mg/m3)   "Prehled Prumyslove Toxikologie; Organicke Latky," Marhold, J., Prague, Czechoslovakia, Avicenum, 1986Vol. -, Pg. 1221, 1986.
mouse LD50 oral 3gm/kg (3000mg/kg)   "Prehled Prumyslove Toxikologie; Organicke Latky," Marhold, J., Prague, Czechoslovakia, Avicenum, 1986Vol. -, Pg. 1221, 1986.

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