Self-condensation

Self-condensation

Self-condensation is an organic reaction in which a chemical compound containing a carbonyl group acts both as the electrophile and the nucleophile in an aldol condensation. It is also called a symmetrical aldol condensation as opposed to a mixed aldol condensation in which the electrophile and nucleophile are different species.

For example, two molecules of acetone condense to a single compound mesityl oxide in the presence of an ion exchange resin: [Ketone Condensations Using Sulfonic Acid Ion Exchange Resin N. Lorette; "J. Org. Chem."; 1957; 22(3); 346-347.]

:2 CH3COCH3 → (CH3)2C=CH(CO)CH3 + H2O

For synthetic uses, this is generally an undesirable, but spontaneous and favored side-reaction of mixed aldol condensation, and special precautions are needed to prevent it.

References


Wikimedia Foundation. 2010.

Игры ⚽ Поможем написать реферат

Look at other dictionaries:

  • self-condensation — kondensavimasis statusas T sritis Standartizacija ir metrologija apibrėžtis Savaiminė kondensacija. atitikmenys: angl. autocondensation; self condensation vok. intermolekulare Kondensation, f; Selbstkondensation, f rus. автоконденсация, f;… …   Penkiakalbis aiškinamasis metrologijos terminų žodynas

  • self-condensation — autokondensacija statusas T sritis chemija apibrėžtis Savaiminė kondensacija. atitikmenys: angl. autocondensation; self condensation rus. автоконденсация; самоконденсация …   Chemijos terminų aiškinamasis žodynas

  • self-condensation — …   Useful english dictionary

  • Condensation reaction — The condensation of two amino acids to form a peptide bond (red) with expulsion of water (blue) A condensation reaction is a chemical reaction in which two molecules or moieties (functional groups) combine to form one single molecule, together… …   Wikipedia

  • condensation reaction — ▪ chemical reaction       any of a class of organic reactions in which two molecules combine, usually in the presence of a catalyst, with elimination of water or some other simple molecule. The combination of two identical molecules is known as… …   Universalium

  • Self-organization — is a process of attraction and repulsion in which the internal organization of a system, normally an open system, increases in complexity without being guided or managed by an outside source. Self organizing systems typically (though not always)… …   Wikipedia

  • Knoevenagel condensation — The Knoevenagel condensation reaction is an organic reaction named after Emil Knoevenagel. It is a modification of the Aldol condensation[1][2]. A Knoevenagel condensation is a nucleophilic addition of an active hydrogen compound to a carbonyl… …   Wikipedia

  • Wealth condensation — is a theoretical process by which, in certain conditions, newly created wealth tends to become concentrated in the possession of already wealthy individuals or entities. According to this theory, those who already hold wealth have the means to… …   Wikipedia

  • Aldol condensation — An aldol condensation is an organic reaction in which an enol or an enolate ion reacts with a carbonyl compound to form a β hydroxyaldehyde or β hydroxyketone, followed by a dehydration to give a conjugated enone. Aldol condensations are… …   Wikipedia

  • industrial polymers, major — Introduction       chemical compounds used in the manufacture of synthetic industrial materials.       In the commercial production of plastics, elastomers, man made fibres, adhesives, and surface coatings, a tremendous variety of polymers are… …   Universalium

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”