Condensation Reaction


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condensation reaction

[‚kän·dən′sā·shən rē′ak·shən]
(chemistry)
One of a class of chemical reactions involving a combination between molecules or between parts of the same molecule.

Condensation Reaction

 

the historically established name in organic chemistry for a large group of reactions that form complex compounds from two or more (several) simple compounds. condensation reactions, differentiated according to the nature of the reagents and the nature of the chemical trans-formations, include many intramolecular and intermolecular processes of formation of new carbon-carbon (C—C) bonds. Most such reactions are accompanied by the separation of some simple inorganic or organic X—Y molecule (for example, water, hydrogen, alcohol, hydrogen halide, halogen):

Examples of this type of condensation reaction are crotonic condensation, the Wurtz reaction, the Claisen condensation, the Knoevenagel reaction, the Perkin reaction, and the Friedel-Crafts reaction.

Unlike the aforementioned reactions, condensation reactions such as benzoin condensation, aldol condensation, and diene synthesis take place without separation of any simple molecule. Furthermore, all reactions that produce heterocyclic compounds are referred to in organic chemistry as condensation reactions; new bonds may emerge during these processes, for example, carbon-carbon, carbon-heteroatom, and heteroatom-heteroatom. Esterification, ester interchange, alkylation, and alkylation over oxygen or nitrogen are generally not included among the condensation reactions. The reactions of the formation of polymers according to these schemes, however, are known as polycondensation reactions.

REFERENCES

Kratkaia khimicheskaia entsiklopediia, vol. 2. Moscow, 1963. Page 678.
Die Methoden der Organischen Chemie, 3rd ed., vol. 2. Edited by J. Houben. Leipzig, 1925. Page 716.
References in periodicals archive ?
In this study, it was observed that condensation reaction of hydroxyl groups of PVA and alkoxysilane leads to restricting the polymer chains movement.
MMT was modified by using an aminoacid, L-phenyl alanine, to induce condensation reactions between its carboxyl end group and the hydroxyl groups of formaldehyde and so, compatibility with the phenolic resin matrix could be increased.
Due to the nature of the aldol condensation reaction employed in the in this study, it is possible that some [alpha]-Ketoacid compounds might interfere during the color formation reaction.
In the condensation reaction of UF resin, methylolureas formed big molecules, containing a lot of active end groups such as hydroxymethy (-C[H.
How it Works These polymers, formed from the same inexpensive starting material through a condensation reaction, these molecules join together and lose small molecules as by-products such as water or alcohol and were created in an operationally simple procedure and are incredibly tunable.
The condensation reaction which creates the Si--o--Si bonds can be originated from: (1) the two silanol groups present in PTES; (2) the two silanol groups present in APES; (3) one silanol group present in APES and another one from PTES.
In order to study the influence of pH on the condensation reaction within the adhesive joint, pot-life determinations were run on the adhesive mixtures at 30[degrees]C with a Brookfield RVF viscometer.
The polyester type polyols are prepared by a condensation reaction between a short-chain diol and a diacid, for example, the reaction of 1,4-butanediol with adipic acid to give poly(tetramethylene adipate)glycol.
In the CT-BISA Process, Bisphenol-A is produced through a condensation reaction of acetone and phenol with an ion-exchange catalyst.
The other is chemically polymerizing aniline monomer and then proceeding the condensation reaction of silica precursors [16, 17, 20-22].
From the FTIR spectrum analysis, we knew that there were two different reactions between epoxy resin and SDOH depending on the reaction temperature, The condensation reaction might be the main reaction at the lower temperature, while at the higher temperature (>150[degrees]C, FTIR spectrum 4 in Fig.
They include condensation reaction curable ones [1-8], and hydrosilylation reaction curable ones [9-16].