Question

Write the equation involved in the following reactions:
(i) Reimer-Tiemann reaction (ii) Kolbe's reaction

Solution
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  • (i) Reimer-Tiemann reaction When phenol is treated with chloroform in the presence of sodium hydroxide, a CHO group is introduced at the ortho position of the benzene ring. This reaction is known as the Reimer-Tiemann reaction. The intermediate is hydrolyzed in presence of alkalis to produce salicylaldehyde.

  • (ii) Kolbe's reaction When phenol is treated with sodium hydroxide, sodium phenoxide is produced. This sodium phenoxide when treated with carbon dioxide, followed by acidification, undergoes electrophilic substitution to give ortho-hydroxybenzoic acid as the main product. This reaction is known as Kolbe's reaction.

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Q1

(a) Write any three methods of preparations of alkyl halides

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Q2

The electrophile involved in Reimer-Tiemann reaction is:


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