Preparation of Si(CH3)3 from SiCl4
Si(CH3)3, also known as trimethylsilane, can be prepared from SiCl4 through a series of steps involving Grignard reagents.

Step 1: Formation of Grignard reagent
- React SiCl4 with magnesium (Mg) in anhydrous ether to form a Grignard reagent, such as MeMgCl (methylmagnesium chloride).
- The reaction is typically carried out under an inert atmosphere, such as nitrogen or argon, to prevent moisture and oxygen from interfering.

Step 2: Reaction with methyl iodide
- The Grignard reagent MeMgCl is then reacted with methyl iodide (CH3I) to introduce the methyl group.
- This reaction forms Me3SiCl (trimethylsilyl chloride).

Step 3: Hydrolysis
- Me3SiCl is then hydrolyzed with water to obtain Si(CH3)3 (trimethylsilane) along with HCl as a byproduct.
- The hydrolysis reaction can be carried out in the presence of a base to neutralize the HCl formed.

Overall reaction:
- SiCl4 + 3Mg + 6CH3I + 6H2O → Si(CH3)3 + 3MgCl2 + 6HI
This method allows for the synthesis of Si(CH3)3 from SiCl4 through a series of controlled reactions. Proper handling of reagents, moisture-sensitive conditions, and appropriate workup steps are essential for the successful preparation of trimethylsilane.