Question

Write a short notes with chemical reaction on
i)Reimer Teimen equation
ii)Friedel Craft's alkylation on phenol​

Answer 1

Answer:

(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.

Explanation:

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