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.
The small amount of oxalic acid was used to promote the hydrolysis and condensation reactions of Si[O.
RESULTS AND DISCUSSION: CONDENSATION REACTION CURABLE RESIN
It was reported that the multiple reactivity of the trifunctional silane-methoxy structure during the silane condensation reaction would also support multiple network formations (13).
That is, it might be expected that the forward condensation reaction in which water is generated in the presence of considerable existing water would proceed more slowly than under the condition where excess water is removed from the reaction by atmospheric drying at 100[degrees]C.
In particular, the condensation reaction of pyridine to quaternary nitrogen occurred in the semi-coke of Yaojie oil shale sample at 600 [degrees]C, quaternary nitrogen representing here the nitrogen atoms in the interior of precursors of the graphene layers.
In addition to the condensation reactions which are the focus of this article, vinyl functional silanes are commonly cured by an addition reaction which involves the addition of a silicon hydride to a terminal vinyl doublebond.
Earlier it was assumed that under strict neutral conditions and at constant temperature the major reaction would be the condensation reaction of dichlorotriazinyl dyes with aminophenyl-P-sulphatoethyl sulphone not the hydrolysis of dichlorotriazinyl dyes or of vinyl sulphone group with water (Lewis and Loan, 2007; Weber and Vicki, 1993).
The resulting formulation was then vacuum dried to constant weight to ensure the removal of any alcohol generated from the condensation reaction [10].
Abstract Silicone/titania hybrids for LED encapsulation were synthesized via hydrolysis and condensation reaction between tetrabutyl titanate and silica sol containing phenyl groups and long alkyl chains.
Equation (2) shows condensation reaction that is comparatively fast.
This proposed condensation reaction may improve the stability of wood against weathering effects.