Learning ObjectiveRecognize the chemical principles of condensation reactions together they relate to polymerization.

You are watching: Why are polymerization reactions sometimes called dehydration synthesis reactions?

Key PointsDuring condensation reaction, 2 molecules integrate to form a solitary molecule with the loss of a tiny molecule; in dehydration reaction, this shed molecule is water.Intermolecular condensation occurs between two separate molecules, while intramolecular condensation is the union between atoms or teams of the exact same molecule, often leading to ring formation.Condensation reactions are provided in condensation polymerization, when a collection of condensation steps kind long chains; this reaction might be either a homopolymerization of a solitary monomer or a copolymerization of 2 co-monomers; many organic transformations room condensation reactions.
Termscondensation polymerizationa polymerization system in which monomers reaction to form dimers first, then trimers, longer oligomers, and also eventually lengthy chain polymerscondensation reactionany reaction in which 2 molecules react v the resulting loss that a water molecule (or other small molecule); the formal reverse of hydrolysisdehydration reactionan elimination (condensation) reaction in which the tiny molecule that is eliminated is water

In a condensation reaction, two molecules or parts thereof combine, publication a tiny molecule. Once this little molecule is water, the is well-known as a dehydration reaction. Other possible lost molecules encompass hydrogen chloride, methanol, and also acetic acid.

When two separate molecules react, your condensation is termed intermolecular. A simple example is the condensation of two amino acids to kind a peptide. This reaction example is the reverse of hydrolysis, i m sorry splits a chemical entity right into two components through activity from the polar water molecule, which itself splits right into hydroxide and hydrogen ions.

Peptide link formed throughout condensation reactionThe condensation (dehydration) of two amino acids to type a peptide link (red) through expulsion that water (blue).

When a condensation is performed in between different parts of the very same molecule, the reaction is termed intramolecular condensation; in countless cases, this leader to ring formation. An example is the Dieckmann condensation, in which the two ester groups of a single diester molecule react through each various other to shed a small alcohol molecule and kind a β-ketoester product.

Many condensation reactions monitor a nucleophilic acyl substitution or an aldol condensation reaction device (see previous principle for much more information). Various other condensations, such as the acyloin condensation, are motivated by radical conditions.

Condensation Polymerization Reactions

In one type of polymerization reaction, a collection of condensation actions takes place whereby monomers or monomer chains include to each other to kind longer chains. This is termed “condensation polymerization,” or “step-growth polymerization,” and also occurs in such procedures as the synthetic of polyesters or nylons. Nylon is a silky material used to make garments made the repeating units linked by amide bonds, and is generally referred to as polyamide. This reaction might be either a homopolymerization that a solitary monomer A-B through two different end teams that condense, or a copolymerization of two co-monomers A-A and also B-B. Little molecules space usually liberated in this condensation steps, unequal polyaddition reactions.

Condensation of diacid and diamineThe condensation of a diacid and diamine is an example of A-B polymerization.

Condensation polymers often require heat, kind slower 보다 do enhancement polymers, and are lower in molecular weight. This kind of reaction is used as a basis for making plenty of important polymers, such as nylon, polyester, and also various epoxies. That is additionally the basis for the laboratory formation of silicates and also polyphosphates. Many organic transformations, such as polypeptide synthesis, polyketide synthesis, terpene syntheses, phosphorylation, and glycosylations room condensations.

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Nylon molecular structureNylon is a fabricated polymer created by condensation polymerization.

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