Dimethyldichlorosilane

Dimethyldichlorosilane is a chemical compound with the formula Si(CH3)2Cl2. This colorless liquid is a versatile silicon-based reagent and a common precursor to silicones, a broad class of synthetic polymers.

Chemical Structure and Properties

Dimethyldichlorosilane is a tetrahedral molecule. The silicon atom is at the center of the tetrahedron, with two chlorine atoms and two methyl groups attached. The molecule is symmetrical, which means it has the same shape on either side of a central plane.

The compound is a colorless liquid at room temperature, with a boiling point of 70°C. It is soluble in organic solvents but reacts with water to produce hydrochloric acid and a silicone polymer.

Production

Dimethyldichlorosilane is produced on an industrial scale as a precursor to silicones. The production process involves the reaction of methyl chloride with silicon in the presence of a copper catalyst.

Applications

The primary use of dimethyldichlorosilane is in the production of silicones, a broad class of synthetic polymers with a wide range of applications. When hydrolyzed, it forms linear and cyclic silicones, depending on the conditions of the reaction. These silicones are used in sealants, adhesives, lubricants, medicine, cooking utensils, and insulation.

Safety

Dimethyldichlorosilane is a corrosive substance that can cause burns and eye damage. It is also harmful if inhaled, and can cause respiratory irritation. Proper safety measures should be taken when handling this chemical.

See Also

• Silicones
• Methyl chloride
• Silicon
• Chemical compound