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Encyclopedia > Transesterification

In organic chemistry, transesterification is the process of exchanging the alkoxy group of an ester compound by another alcohol. These reactions are often catalyzed by the addition of an acid or base. Organic chemistry is a specific discipline within chemistry which involves the scientific study of the structure, properties, composition, reactions, and preparation (by synthesis or by other means) of chemical compounds consisting of primarily carbon and hydrogen, which may contain any number of other elements, including nitrogen, oxygen, halogens as well... In chemistry, the alkoxyl group is an alkyl group linked to oxygen thus: R-O. The range of alkoxy groups is as great, the simplest being methoxy (-OCH3). ... This article is in need of attention. ... Functional group of an alcohol molecule. ... It has been suggested that this article or section be merged into Catalysis. ... Acidity redirects here. ... Acids and bases: Acid-base reaction pH Self-ionization of water Buffer solutions Systematic naming Acid-base extraction Acidity function Proton affinity Acids: Strong acids Weak acids Superacids Lewis acids Mineral acids Organic acids Bases: Strong bases Weak bases Superbases Lewis bases Organic bases edit In chemistry, a base is...

Transesterification: alcohol + ester → different alcohol + different ester
Transesterification: alcohol + ester → different alcohol + different ester

Acids can catalyse the reaction by donating a proton to the carbonyl group, thus making it more reactive, while bases can catalyse the reaction by removing a proton from the alcohol, thus making it more reactive. Image File history File links Size of this preview: 800 × 164 pixelsFull resolution (1100 × 226 pixel, file size: 9 KB, MIME type: image/png) File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Transesterification ... Image File history File links Size of this preview: 800 × 164 pixelsFull resolution (1100 × 226 pixel, file size: 9 KB, MIME type: image/png) File links The following pages on the English Wikipedia link to this file (pages on other projects are not listed): Transesterification ... Carbonyl group In organic chemistry, a carbonyl group is a functional group composed of a carbon atom double-bonded to an oxygen atom : C=O. The term carbonyl can also refer to carbon monoxide as a ligand in an inorganic or organometallic complex (a metal carbonyl, e. ...


Transesterification is used in the synthesis of polyester, in which diesters undergo transesterification with diols to form macromolecules. For example, dimethyl terephthalate and ethylene glycol react to form polyethylene terephthalate and methanol, which is evaporated to drive the reaction forward. The reverse reaction (methanolysis) is also an example of transesterification, and has been used to recycle polyesters into individual monomers (see plastic recycling). SEM picture of a bend in a high surface area polyester fiber with a seven-lobed cross section Polyester is a category of polymers, or, more specifically condensation polymers, which contain the ester functional group in their main chain. ... Dimethyl terephthalate is an organic chemical used in the production of polyesters, including polyethylene terephthalate. ... Ethylene glycol (monoethylene glycol (MEG), IUPAC name: ethane-1,2-diol) is an alcohol with two -OH groups (a diol), a chemical compound widely used as an automotive antifreeze. ... Polyethylene terephthalate (aka PET, PETE or the obsolete PETP or PET-P) is a thermoplastic polymer resin of the polyester family that produced by the chemical industry and is used in synthetic fibers; beverage, food and other liquid containers; thermoforming applications; and engineering resins often in combination with glass fiber. ... Methanol, also known as methyl alcohol, carbinol, wood alcohol, wood naptha or wood spirits, is a chemical compound with chemical formula CH3OH. It is the simplest alcohol, and is a light, volatile, colourless, flammable, poisonous liquid with a distinctive odor that is somewhat milder and sweeter than ethanol (ethyl alcohol). ... Plastic recycling is the process of taking scrap or waste plastics and recovering the material for use in manufacturing. ...


History of biolipid transesterification

One of the first uses of transesterified vegetable oil (biodiesel) was to power heavy-duty vehicles in South Africa before World War II. The name "biodiesel" has been given to transesterified vegetable oil to describe its use as a diesel fuel. It has been suggested that this article or section be merged with cooking oil. ... In some countries, filling stations sell bio-diesel more cheaply than conventional diesel. ... Combatants Allied powers: China France Great Britain Soviet Union United States and others Axis powers: Germany Italy Japan and others Commanders Chiang Kai-shek Charles de Gaulle Winston Churchill Joseph Stalin Franklin Roosevelt Adolf Hitler Benito Mussolini Hideki Tōjō Casualties Military dead: 17,000,000 Civilian dead: 33,000...


It was patented in the U.S. in the 1940s by Colgate, though biolipid transesterification may have been discovered much earlier. In the 1940s, researchers were looking for a method to more readily produce glycerine, which was used to produce explosives for World War II. Many of the methods used today by producers and homebrewers have their origin in the original 1940s research. A patent is a set of exclusive rights granted by a state to a patentee (the inventor or assignee) for a fixed period of time in exchange for the regulated, public disclosure of certain details of a device, method, process or composition of matter (substance) (known as an invention) which... Motto: (Out Of Many, One) (traditional) In God We Trust (1956 to date) Anthem: The Star-Spangled Banner Capital Washington D.C. Largest city New York City None at federal level (English de facto) Government Federal constitutional republic  - President George Walker Bush (R)  - Vice President Dick Cheney (R) Independence from... Colgate redirects here. ... Glycerin, also known as glycerine and glycerol, and less commonly as 1,2,3-propanetriol, 1,2,3-trihydroxypropane, glyceritol, and glycyl alcohol is a colorless, odorless, hygroscopic, and sweet tasting viscous liquid. ... This article is concerned solely with chemical explosives. ... Combatants Allied powers: China France Great Britain Soviet Union United States and others Axis powers: Germany Italy Japan and others Commanders Chiang Kai-shek Charles de Gaulle Winston Churchill Joseph Stalin Franklin Roosevelt Adolf Hitler Benito Mussolini Hideki Tōjō Casualties Military dead: 17,000,000 Civilian dead: 33,000...


Health considerations

Interesterified fats, when used as replacement fats for trans fats, not only lower desirable High density lipoprotein levels but also cause undesirable increases in blood sugar concentrations. Interesterified fats, a limited study shows, adversely effect the body's insulin concentrations, reducing the regulation of blood sugar and increasing the risk to diabetics. For comparable amounts of palm oil, as compared with interesterified soybean oil, the interesterified fat increased volunteers' blood sugar by 20 percent in studies documented the journal Nutrition & Metabolism. Although the research is preliminary, interesterified fats, which are used to replace trans fats in commercial foods, arguably have adverse health effects and warrant more research prior to extensive use.[1] A trans fatty acid (commonly shortened to trans fat) is an unsaturated fatty acid molecule that contains a trans double bond between carbon atoms, which makes the molecule less kinked compared to cis fat. Research suggests a correlation between diets high in trans fats and diseases like atherosclerosis and coronary... High-density lipoproteins (HDL) form a class of lipoproteins, varying somewhat in their size (8–11 nm in diameter), that carry cholesterol from the bodys tissues to the liver. ... Insulin (from Latin insula, island, as it is produced in the Islets of Langerhans in the pancreas) is a polypeptide hormone that regulates carbohydrate metabolism. ... In medicine, blood sugar is a term used to refer to levels of glucose in the blood. ... This article is about the disease that features high blood sugar. ... Palm oil from Ghana with its natural dark color visible, 2 litres Palm oil block Palm oil is a form of edible vegetable oil obtained from the fruit of the oil palm tree. ... Binomial name Glycine max Merr. ...


See Also

Interesterified fat Interesterified fats are oils (such as soybean oil) that have been chemically modified. ...


  Results from FactBites:
 
NationMaster - Encyclopedia: Transesterification (1434 words)
Transesterification is used in the synthesis of polyester, in which diesters undergo transesterification with diols to form macromolecules.
Transesterification is the magic trick that brings the physico-chemical properties of the neat oil close to that of diesel fuel.
The transesterification process is the reaction of a triglyceride (fat/oil) with an bioalcohol to form esters and glycerol.
C&EN: NEWS OF THE WEEK - FLUOROUS BIPHASIC TRANSESTERIFICATION (441 words)
A new fluorinated catalyst-solvent system that overcomes some of the traditional limitations of transesterification reactions--thus boosting its potential as a green industrial process--has been developed by a research team at Okayama University of Science in Japan.
Generally, transesterification involves the acid- or base-catalyzed reaction of an ester and an alcohol that leads to double displacement of substituent groups.
They are equilibrium-dependent reactions, meaning a large excess of the ester or alcohol is needed to drive the reaction, with one of the reactants usually acting as the solvent.
  More results at FactBites »

 
 

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