Tetraethyl Orthosilicate (TEOS) (Si(CH30)4)

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Tetraethyl Orthosilicate (TEOS) (Si(CH30)4)

TEOS is a colourless liquid that degrades in water. TEOS is the ethyl ester of orthosilicic acid, Si(OH)4. It is the most prevalent alkoxide of silicon.
TEOS is a tetrahedral molecule. Like its many analogues, it is prepared by alcoholises of silicon tetrachloride: SiCl4 + 4 EtOH → Si(OEt)4 + 4 HCl where Et is the ethyl group, C2H5, and thus EtOH is ethanol.

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