Tetramethyl orthosilicate is the chemical compound with the formula Si(OCH3)4. This molecule consists of four methyl groups attached to the hypothetical anion SiO44−. The basic properties are similar to the more popular tetraethyl orthosilicate, which is usually preferred because the product of hydrolysis, ethanol, is less toxic than methanol.
Tetramethyl orthosilicate hydrolyzes to SiO2:
Si(OCH3)4 + 2 H2O → SiO2 + 4 CH3OH
In organic synthesis, Si(OCH3)4 has been used to convert ketones and aldehydes to the corresponding ketals and acetals, respectively.
CAS No.
681-84-5
Formula
C4H12O4Si
Molecular Mass
152.22100
Exact Mass
152.05000
PSA
36.92000
Logp
0.00760
IUPAC
tetramethyl silicate
Attribute classification
Category
Chemical and Physical Properties
Melting Point
−4 °C(lit.)
Density
1.023 g/mL at 25 °C(lit.)
Boiling Point
121-122 °C(lit.)
Flash Point
84 °F
Appearance
colorless liquid
Export information
HS Code
2920900090
UN No.
2606 6.1/PG 1
DG-Class
6.1
Risk Code
R10; R26; R37/38; R41
Safety Label
T+
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