User:TJ.Jang/sandbox

A condensation reaction is a class of an organic addition reaction that proceeds in a step-wise fashion to produce the addition product, usually in equilibrium, and a water molecule (hence named condensation). The reaction may otherwise involve the functional groups of the molecule and formation of ammonia, ethanol, or acetic acid. It is a versatile class of reactions that can occur in acidic or basic conditions or in the presence of a catalyst. This class of reactions is a vital part of life as it is essential to the formation of peptide bonds between amino acids and the biosynthesis of fatty acids.

Glycosidic bond
Monosaccharides are the basic unit of the carbohydrates and blocks to build the Oligosaccharides and Polysaccharides. Through the condensation reaction, Monosaccarides increase the weight of molecules and reach higher degree of polymerization(Polysaccharide), while losing water molecules. This is the acid-catalyzed reaction and produce heavier carbohydrate.



Basic condition
====Aldol condensation ====

After the adol reaction, which is a reaction of an enol or an enolate ion with carbonyl compound, dehydration process follows. This dehydration (Aldol condensation) provide a way to form carbon-carbon bonds in organic synthesis.



Claisen condensation
In the base condition, two ester or ester and carbonyl forms carbon-carbon bond and result in another ester or diketone. The equivalent reaction of intermolecular is Dieckmann condensation



Dieckmann condensation
It is a intramolecular reaction of diesters with base.



Knoevenagel condensation
As a variation of aldol condensation, it is a reaction between active hydrogen and carbonnyl group (aldehyde or ketone)