In a manner similar to that outlined on page 1022, 

(a) Write equations to represent the reaction of (CH₃)₃SiCl with water, followed by the elimination of H₂O from the resulting silanol molecules.

(b) Does a silicone polymer form from part (a)?

(c) What would be the corresponding product obtained from CH₃SiCl₃?

Transcribed Image Text:

Silanes and Silicones Several silicon-hydrogen compounds are known, but because Si Si single bonds are not particularly strong, the chain length in these compounds, called silanes, is limited to six. H H-Si-H H Monosilane HH T T H-Si-Si-H HH Disilane HHH | T H-Si-Si-Si-H S6H14 CH3 CH3 HO-Si-O-H + HO-Si-OH I CH3 CH3 HHH Trisilane Other atoms or groups of atoms can be substituted for H atoms in silanes to produce compounds called organosilanes. Typical is the direct reaction of Si and methyl chloride, CH3Cl. The equation for the reaction is given below: 2 CH3Cl + Si (CH3)2SiCl2 The reaction of (CH3)2SiCl2, dichlorodimethylsilane, with water produces an interesting compound, dimethylsilanol, (CH3)2Si (OH)2. Dimethylsilanol under- goes a polymerization reaction in which H₂O molecules are eliminated from among large numbers of silanol molecules. The result of this polymerization is a material consisting of molecules with long silicon-oxygen chains: silicones. Hexasilane -H₂O CH3 CH3 CH3 →HO-Si-O-Si-o-Si-OH CH3 CH3 CH3 A silicone n