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What does coupling reaction mean

A coupling reaction is a 2A-B → A-A type of reaction. It is a process in which an organic molecule is obtained by a certain chemical reaction between two organic chemical units.

It is a 2A-B→A-A-A type of reaction. Examples include: the Ullman reaction, the decarboxylation coupling reaction, and the Grayan reaction. Coupling reactions have a variety of pathways and are more widely used in organic synthesis. The reaction in which amino acids combine to form a protein is also a coupling reaction.