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The reaction for the synthesis of Me2SiCl2 through Rochow-Müller process is

  • A.\(\mathrm{SiCl_4 + Me_2Zn \xrightarrow{0\ ^{\circ}C}}\)
  • B.\(\mathrm{Si{:}Fe\ (9{:}1) + 2\,MeCl \xrightarrow{300\ ^{\circ}C}}\)
  • C.\(\mathrm{Si{:}Cu\ (9{:}1) + 2\,MeCl \xrightarrow{300\ ^{\circ}C}}\)
  • D.\(\mathrm{SiCl_4 + 2\,MeMgBr \xrightarrow{0\ ^{\circ}C}}\)

Answer: C

The Rochow-Müller reaction is Si:Cu (9:1) + 2 MeCl at 300 °C.

In this direct process, used industrially for silicones, methyl chloride is passed over silicon mixed with a copper catalyst at about 300 °C. The main product is dimethyldichlorosilane, Me2SiCl2, the monomer for polydimethylsiloxane.

Iron is not the catalyst of the process, so the Si:Fe option is wrong. The reactions of SiCl4 with dimethylzinc or methylmagnesium bromide are laboratory routes to methylchlorosilanes through organometallic reagents; they are not the Rochow-Müller process.

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