A-level Chemistry/OCR (Salters)/Condensation reactions

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A condensation reaction is a reaction in which two molecules combine to form one molecule, eliminating a small molecule, such as HCl or H2O, in the process.

Peptide bond formation[edit]

Two amino acids can react with one another to form a dipeptide, linked by a peptide bond. A peptide bond is nothing more than a secondary amide functional group linking two amino acid residues. A water molecule is eliminated as a result.

In the illustrations below, two glycine molecules undergo condensation to form GlyGly (glycylglycine or 2-(2-aminoethanamido)ethanoic acid), expelling a water molecule.

Glycine-condensation-1-3D-balls.png Arrow east.svg Glycine-condensation-2-3D-balls.png