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Silicomes-oxalic Acid, H4Si3O6

Silicomes-oxalic Acid, H4Si3O6, which is the silicon analogue of mesoxalic acid:

Mesoxalic acid Silicomes-oxalic-oxalic acid

is formed by the action of moist air on octachlorosilicopropane, Si3Cl8, at 0° C. It is a white unstable powder, which is insoluble in water, but reacts with alkali forming silicate and hydrogen:

H4Si3O6 + 6NaOH = 3Na2SiO3 + 3H2O + 2H2.

It possesses reducing properties, indicated thus:

H4Si3O6 + 2O = 2H2O + 3SiO2.

Silico-oxalic acid and silicomes-oxalic acid yield identical forms of silica when treated with ammonia, and Martin 1 accounts for this fact by the following scheme, in which the polymerised and cyclic constitution of these two acids is set forth:

Si2(OEt)6
Ethyl ortho-silico-oxalate
Si3Cl8
Octachlorosilicopropane
H2OH2O
Si2(OH)6
ortho-silico-oxalic acid (unstable); 3 mols. condense
Si3(OH)8
ortho-silicomes-oxalic acid (unstable); 2 mols. condense

Silico-oxalic acid

Silicomes-oxalic acid
NH3 aq.NH3 aq.


When ethyl ortho-silico-oxalate (hexa-ethoxysilico-ethane) is treated with sodium or potassium hydroxide solution, hydrogen is evolved, and a silicate formed by the interpolation of an oxygen atom between the two silicon atoms thus:

+ 2KOH + H2O = + 2ROH + H2.

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