Write a short note on Reimer-Tiemann reaction?

write a short note on Reimer-Tiemann reaction?

Reimer-Tiemann reaction:

On treating phenol with chloroform in the presence of sodium hydroxide, a �CHO group is introduced at ortho position of benzene ring. This reaction is known as Reimer - Tiemann reaction.

The intermediate substituted benzal chloride is hydrolysed in the presence of alkali to produce salicylaldehyde.
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