Dodecamethylcyclohexasilane

Dodecamethylcyclohexasilane is the organosilicon compound with the formula Si6(CH3)12. It is one of the more readily prepared and easily handled polysilanes. Dodecamethylcyclohexasilane is produced by reduction of dimethyldichlorosilane with sodium-potassium alloy:[1]

6 (CH3)2SiCl2 + 12 M → Si6(CH3)12 + 12 MCl
Dodecamethylcyclohexasilane
Names
IUPAC name
1,1,2,2,3,3,4,4,5,5,6,6-dodecamethylhexasilinane
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.021.691
EC Number
  • 223-860-0
  • InChI=1S/C12H36Si6/c1-13(2)14(3,4)16(7,8)18(11,12)17(9,10)15(13,5)6/h1-12H3
    Key: RTCLHEHPUHREBC-UHFFFAOYSA-N
  • C[Si]1([Si]([Si]([Si]([Si]([Si]1(C)C)(C)C)(C)C)(C)C)(C)C)C
Properties
Si6(CH3)12
Molar mass 348.930 g·mol−1
Appearance colorless solid
Density 0.988 g/cm3
Melting point 254–257 °C (489–495 °F; 527–530 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

where M is Na or K. The reaction also produces a polymer poly(dimethylsilylene) [−Si(CH3)2−]n and a cyclic compound decamethylcyclopentasilane Si5(CH3)10.

  • Poly(dimethylsilylene) molecule
    Poly(dimethylsilylene), a polymer
  • Decamethylcyclopentasilane molecule
    Decamethylcyclopentasilane, a cyclic compound

The chair conformer of dodecamethylcyclohexasilane was confirmed by X-ray crystallography.[2]

Reactions

Dodecamethylcyclohexasilane reacts with potassium tert-butoxide to give the potassium derivative:[3]

(CH3)12Si6 + KOC(CH3)3 → K(CH3)11Si6 + CH3OC(CH3)3

References
  1. West, Robert; Brough, Lawrence; Wojnowski, Wieslaw (1979). "Dodecamethylcyclohexasilane". Inorganic Syntheses. 19: 265–268. doi:10.1002/9780470132500.ch62. ISBN 9780470132500.
  2. Omatsu, Yamato; Mizuhata, Yoshiyuki; Tokitoh, Norihiro (2018). "Synthesis of Dodecaallylhexasilacyclohexane and Its Convertibility". Zeitschrift für Anorganische und Allgemeine Chemie. 644 (17): 930–934. doi:10.1002/zaac.201800171. S2CID 105286121.
  3. Palitzsch, Wolfram; Beyer, Christian; Böhme, Uwe; Rittmeister, Ben; Roewer, Gerhard (1999). "Preparation, Characterization, and Properties of Various Novel Ionic Derivatives of Pentacarbonyltungsten". European Journal of Inorganic Chemistry. 1999 (10): 1813–1820. doi:10.1002/(SICI)1099-0682(199910)1999:10<1813::AID-EJIC1813>3.0.CO;2-D.
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