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Hexamethyldisilane

Chemical compound From Wikipedia, the free encyclopedia

Hexamethyldisilane
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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]

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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:

2 Me3SiCl + 2 K → Me3Si−SiMe3 + 2 KCl

With an excess of the reductant, the alkali metal silyl derivative is produced:[2]

Me3Si−SiMe3 + 2 K → 2 Me3SiK

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]

Me3SiSiMe3 + I2 → 2 SiMe3I
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References

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