Hexamethyldisilane
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| Template:Longitem | Template:Unbulleted list |
| Template:Longitem | 1633463 |
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| UN number | 1993 |
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| Template:Longitem | Si2C6H18 |
| Molar mass | 146.39 g mol−1 |
| Appearance | Colourless liquid |
| Density | 0.715 g/cm3 |
| Melting point | Template:Chembox CalcTemperatures |
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| Template:Longitem | 1.422 |
| Template:Longitem | 255.89 J K−1 mol−1 (at 22.52 °C) |
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| Template:Longitem | Tetramethylsilane |
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Hexamethyldisilane (TMS2) is the organosilicon compound with the formula Si2(CH3)6, abbreviated Si2Me6. It is a colourless liquid, soluble in organic solvents.[1]
Synthesis and reactions
Hexamethyldisilane can be produced by Wurtz-like coupling of trimethylsilyl chloride in the presence of a reducing agent such as potassium graphite:
With an excess of the reductant, the alkali metal silyl derivative is produced:[2]
The Si-Si bond in hexamethyldisilane is cleaved by strong nucleophiles and electrophiles. Alkyl lithium compounds react as follows:
- Si2Me6 + RLi → RSiMe3 + LiSiMe3
Iodine gives trimethylsilyl iodide.[3]
- Me3Si−SiMe3 + I2 → 2 SiMe3I
References
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