Write the equations involved in the following reactions: (i) Reimer-Tiemann reaction (ii) Kolbe's 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. The intermediate substituted benzal chloride is hydrolysed in the presence of alkali to produce salicylaldehyde.
Kolbe's reaction: The provided context mentions Kolbe's reaction in Question 7.18 but does not provide the specific equation or reaction details.
Explanation
The textbook context provides a clear description of the Reimer-Tiemann reaction, explaining that phenol reacts with chloroform in the presence of sodium hydroxide to introduce a –CHO group at the ortho position, ultimately yielding salicylaldehyde after hydrolysis. However, while Kolbe's reaction is referenced in the context (Question 7.18), the actual reaction equation and mechanism are not included in the provided text chunks. Students should note that Kolbe's reaction involves the reaction of phenol with carbon dioxide under pressure in the presence of sodium hydroxide, but this information is not available in the given context.