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Explain the preparation of silicones.

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Generally silicones are prepared by the hydrolysis of dialkyldichiorosilanes (R2SiCl2) or diaryldichlorosilanes Ar2SiCl2 , which are prepared by passing vapours of RCl or ArCl over siliconat 570 K with copper as a catalyst.

The hydrolysis of dialkvlchloro silanes R2SiCl2 yields to a straight chain polymer which grown from both the sides

The hydrolysis of monoalkylchloro silanes RSiCl3 , yields to a very complex cross linked polymer Linear silicones can be converted into cyclic or ring silicones when water molecules is removed

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