Methyltrichlorosilane

• Methyltrichlorosilane
• Methylsilyltrichloride
• Methylsilicontrichlorid

Highly flammable, colorless liquid with a pungent odor

Liquid

1.29 g · cm -3 ( 20 ° C)

-90 ° C

66 ° C.

17.9 kPa ( 20 ° C)

Reacts with water

1.4106 (20 ° C)

Risk

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Trichloromethylsilane is a colorless, clear liquid with a pungent odor. It belongs to the group of halogenated silanes and is a basic chemical in organic synthesis, especially in the protection group chemistry.

Production and representation

Trichloromethylsilane is jointly manufactured with dichlorodimethyl and chlorotrimethylsilane about the Müller -Rochow synthesis. In this case, powdered silicon with chloromethane first reacted at 350 ° C in the presence of powdered copper and copper oxide as a catalyst to dichlorodimethylsilane, the disproportionation under the reaction conditions to chlorotrimethylsilane and trichloromethylsilane:

The product mixture can be separated by distillation due to the different boiling points of its components. Traces of hydrogen chloride, which is possibly present in the chlorotrimethylsilane by hydrolysis, can be removed by distillation with the addition of little quinoline.

Use

Trichloromethylsilane is a raw material for the production of pyrogenic silica and high purity silicon carbide.

CH3SiCl3 HCl → SiC 3 H2 ( at 1110 to 1900 ° C)

Safety

Since the vapors are heavier than air, explosive mixtures may form at the bottom. On contact with water and humidity is hydrochloric acid, which can cause burns forms.