Thursday, April 26, 2012

the introduction of Industrial Sodium Dichromate


Dichromate and chromate salts are acerbic agents. For the tanning of leather, sodium dichromate is aboriginal bargain with sulfur dioxide.
In the breadth of amoebic synthesis, this admixture oxidizes benzylic and allylic C-H bonds to carbonyl derivatives. For example, 2,4,6-trinitrotoluene is breakable to the agnate carboxylic acid. Similarly, 2,3-dimethylnaphthalene is breakable by Na2Cr2O7 to 2,3-naphthalenedicarboxylic acid.
Secondary alcohols are breakable to the agnate ketone, e.g. menthol to menthone; dihydrocholesterol to cholestanone:
3 R2CHOH + Cr2O72- + 2 H+ → 3 R2C=O + Cr2O3 + 4 H2O
Relative to the potassium salt, the capital advantage of sodium dichromate is its greater solubility in baptize and arctic solvents like acerb acid.
When acrimonious acerb undergoes a acknowledgment : 4Na2Cr2O7 -> 4Na2CrO4 + 2Cr2O3 + 3O2
Safety
Like all hexavalent chromium compounds, sodium dichromate is advised hazardous. It is aswell a accepted carcinogen.

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