Chemical elements
    Physical Properties
    Chemical Properties
      Silicon Tetrahydride
      Silicon Tetrafluoride
      Hydrofluosilicic Acid
      Silicon Subfluoride
      Silicon Tetrachloride
      Silicon Tetrabromide
      Silicon Tetra-iodide
      Mixed Halides of Silicon
      Halogen Derivatives of Silico-ethane
      Halogen Derivatives of Silicopropane
      Halogen Derivatives of Silicobutane
      Halogen Derivatives of Silicopentane and Silicohexane
      Silicon Oxychlorides
      Silicon Dioxide
      Silicoformic Anhydride
      Silico-oxalic Acid
      Silicomes-oxalic Acid
      Silicon Disulphide
      Silicon Monosulphide
      Silicon Oxysulphide
      Silicon Thiochloride
      Silicon Thiobromide
      Silicon Chloroitydrosulphide
      Silicon Selenide
      Silicon Tetramide
      Silicon Di-imide
      Silicon Nitrimide
      Siliconitrogen Hydride
      Silicon Nitrides
      Crystalline Silicon Monocarbide
      Silicon Dicarbide
      Silicon Carboxide
      Borides of Silicon
    PDB 1fuq-4ehr

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:

Ethyl ortho-silico-oxalate
ortho-silico-oxalic acid (unstable); 3 mols. condense
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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