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Learn how benzene reacts with CO and HCl to form benzaldehyde in the presence of Lewis catalysts and a co-catalyst. Find out the reaction mechanism, applications, and limitations of this electrophilic substitution process. The Gattermann Koch reaction is defined as a mechanism that begins with the formation of the reactive species with the usage of an Acid. The main objective of the reaction is the attachment of a formyl group (-CHO group) to an aromatic system. Gattermann-Koch Reaction About Gattermann-Koch Reaction Benzaldehyde and many aromatic aldehydes are conveniently synthesized by treating benzene (or other aromatic compounds) with a mixture of carbon monoxide and hydrogen chloride (compounds of formyl chloride) in the presence of an equimolecular quantity of Lewis acid and a trace of copper (I) chloride. The initially formed cation (C+HO) adds to the benzene nucleus to give the σ complex which yields the aldehyde. Reaction Mechanism of ... What is Gattermann Koch reaction ? The reaction is named after two German chemists Ludwig Gattermann and Julius Arnold Koch . In the Gattermann Koch reaction , instead of using hydrogen cyanide, we use carbon monoxide. The other names of Gattermann Koch reaction are Gattermann Koch formylation reaction and Gattermann salicylaldehyde synthesis.
