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Explain the following with an example ...

Explain the following with an example .
Kolbe 's reaction .

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Kolbe .s reaction or Kolbe -Schmidt reaction .this reaction consists of heating sodium phenoxide with carbon dioxide at 400 K under 4-7 atmospheric pressure followed by acidification with mineral acids to give salicylic acid as the main product .

A small amount of p isomer (4- hydroxybenzoic acid ) is also formed .But the isomers are readily separated by steam distillation .The o- isomer being more volatile isteam distills leaving behind the p - isomer .
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