Dehydration reaction

A dehydration reaction is a type of chemical reaction that involves the loss of a water molecule from the reacting molecule. This is a common process in many biological systems and is also a part of the process of polymerization.

Overview

Dehydration reactions are a subset of condensation reactions. In a dehydration reaction, a water molecule is formed as a result of the combination of a hydrogen atom (H) and a hydroxyl group (OH) from another molecule. This process is typically facilitated by an enzyme.

Biological Importance

Dehydration reactions are crucial in many biological processes. For instance, they play a key role in the formation of disaccharides, such as sucrose and lactose, and polysaccharides, such as starch and glycogen. They are also involved in the formation of peptide bonds between amino acids to form proteins.

Examples

One of the most common examples of a dehydration reaction is the process of forming a peptide bond between two amino acids. This reaction involves the removal of a water molecule, with the hydrogen coming from the amino group of one amino acid and the hydroxyl group coming from the carboxyl group of the other amino acid.

Another example is the formation of a glycosidic bond between two monosaccharides to form a disaccharide. This reaction also involves the removal of a water molecule, with the hydrogen coming from the hydroxyl group of one monosaccharide and the hydroxyl group coming from the other monosaccharide.

See Also

• Hydrolysis
• Condensation reaction
• Polymerization
• Peptide bond
• Glycosidic bond

References

• 
  Cyclohexensynthese1
• 
  Cyclohexensynthese2
• Elimination reaction of glycerol to acrolein
  Elimination reaction of glycerol to acrolein