Question

Explain Gattermann reaction?​

Answer 1

The Gattermann reaction, (also known as the Gattermann formylation and the Gattermann salicylaldehyde synthesis) is a chemical reaction in which aromatic compounds are formylated by a mixture of hydrogen cyanide (HCN) and hydrogen chloride (HCl) in the presence of a Lewis acidcatalyst such as AlCl3. It is named for the German chemist Ludwig Gattermann[1] and is similar to the Friedel–Crafts reaction.

Answer 2

Gattermann reaction:

Conversion of benzene diazonium chloride into chloro / bromo arenes can also be affected using hydrochloric / hydrobromic acid and copper powder.