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| CAS No.: | 3277-26-7 |
|---|---|
| Name: | 1,1,3,3-Tetramethyldisiloxane |
| Molecular Structure: | |
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|
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| 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: |
 F
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| 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 |
| Conditions | Yield |
|---|---|
| 91% |
1,1,3,3-Tetramethyldisiloxane
| Conditions | Yield |
|---|---|
| With water In diethyl ether at 5℃; for 1.5h; Irradiation; | 85% |
| Conditions | Yield |
|---|---|
| With water In tetrahydrofuran for 0.5h; Cooling with ice; | A n/a B 82% |
tetraethoxy orthosilicate
dimethyl(ethoxy)silane
A
1,1,3,3-Tetramethyldisiloxane
B
tetrakis(dimethylsilyloxy)silane
| Conditions | Yield |
|---|---|
| With water In benzene at 38 - 40℃; for 2h; | A 19% B 69% |
| Conditions | Yield |
|---|---|
| und Behandeln des Reaktionsprodukts mit H2O; | |
| und Behandeln des Reaktionsprodukts mit H2O; |
| Conditions | Yield |
|---|---|
| With water | |
| With hydrogenchloride; water at -10 - 50℃; for 4h; |
dimethylmonochlorosilane
A
1,1,3,3-Tetramethyldisiloxane
B
3-dimethylsilanyloxy-1,1,5,5-tetramethyl-trisiloxane
| Conditions | Yield |
|---|---|
| With trichlorosilane Hydrolysis; |
| Conditions | Yield |
|---|---|
| With water for 0.333333h; Ambient temperature; | 0.185 g |
1,1,1,3,3-pentamethyl-1,3-disiloxane
A
1,1,3,3-Tetramethyldisiloxane
B
Hexamethyldisiloxane
| Conditions | Yield |
|---|---|
| KU-23 sulfonic cation exchanger at 12℃; Equilibrium constant; |
1-chloromethyl-1,1,3,3-tetramethyldisiloxane
A
1,1,3,3-Tetramethyldisiloxane
B
1,3-Bis(chloromethyl)-1,1,3,3-tetramethyldisiloxane
| Conditions | Yield |
|---|---|
| KU-23 sulfonic cation-exchanger Equilibrium constant; |
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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. |
