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| CAS No.: | 1438-82-0 |
|---|---|
| Name: | PENTAMETHYLDISILOXANE |
| Molecular Structure: | |
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| Formula: | C5H16OSi2 |
| Molecular Weight: | 148.352 |
| Synonyms: | Disiloxane,pentamethyl- (6CI,7CI,8CI,9CI);1,1,1,3,3-Pentamethyldisiloxane;1,1,3,3,3-Pentamethyldisiloxane;Dimethyl(trimethylsiloxy)silane;Dimethyl(trimethylsilyloxy)silane;Pentamethyldisiloxane;Trimethylsiloxydimethylsilane; |
| EINECS: | 215-873-5 |
| Density: | 0.760 g/mL at 20 °C(lit.) |
| Boiling Point: | 84.5 °C at 760 mmHg |
| Flash Point: | 4.9 °C |
| Solubility: | Not miscible or difficult to mix in water. |
| Hazard Symbols: |
 F
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| Risk Codes: | 11 |
| Safety: | 16-23-24/25 |
| Transport Information: | UN 1993 |
| PSA: | 9.23000 |
| LogP: | 1.82130 |
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Specification
This chemical is called Disiloxane, 1,1,1,3,3-pentamethyl-, and it can also be named as Pentamethyldisiloxane. With the molecular formula of C5H16OSi2, its molecular weight is 148.35. The CAS registry number of this chemical is 1438-82-0. In addition, this chemical should be sealed in the cool and dry place, away from oxides, water and moisture.
Other characteristics of the Disiloxane, 1,1,1,3,3-pentamethyl- can be summarised as followings: (1)ACD/LogP: 3.54; (2)# of Rule of 5 Violations: 0; (3)ACD/LogD (pH 5.5): 3.54; (4)ACD/LogD (pH 7.4): 3.54; (5)ACD/BCF (pH 5.5): 286.56; (6)ACD/BCF (pH 7.4): 286.56; (7)ACD/KOC (pH 5.5): 1997.47; (8)ACD/KOC (pH 7.4): 1997.47; (9)#H bond acceptors: 1; (10)#H bond donors: 0; (11)#Freely Rotating Bonds: 2; (12)Polar Surface Area: 9.23 Å2; (13)Flash Point: 4.9 °C; (14)Enthalpy of Vaporization: 31.15 kJ/mol; (15)Boiling Point: 84.5 °C at 760 mmHg; (16)Vapour Pressure: 80.5 mmHg at 25°C.
Production method of this chemical: The Disiloxane, 1,1,1,3,3-pentamethyl- could be obtained by the reactant of methoxypentamethyldisiloxane. This reaction needs the reagent of iBu2AlH, and the solvent of diethyl ether. The yield is 92 %.
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Uses of this chemical: The Disiloxane, 1,1,1,3,3-pentamethyl- could react with 1,4-dichloro-but-2-yne, and obtain the 1,4-Dichlor-2-(pentamethyldisiloxanyl)but-2-ene. This reaction needs the reagent of Platin-Divinyltetramethyldisiloxan-Komplex. The yield is 60 %. In addition, this reaction should be taken for 2 hours at the temperature of 160 °C.
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When you are using this chemical, please be cautious about it as the following: This chemical is highly flammable. Keep it away from sources of ignition - No smoking. Do not breathe vapour. Avoid contacting with skin and eyes.
You can still convert the following datas into molecular structure:
1.SMILES: O([Si](C)(C)C)[SiH](C)C
2.InChI: InChI=1/C5H16OSi2/c1-7(2)6-8(3,4)5/h7H,1-5H3
3.InChIKey: AOJHDNSYXUZCCE-UHFFFAOYAZ