Biolipid transesterification has also been recently shown by Japanese researchers to be possible using a super-critical methanol methodology, whereby high temperature, high-pressure vessels are used to physically catalyze the biolipid/methanol reaction into fatty-acid methyl esters. These reactions are often catalyzed by the addition of an acid or base catalyst. In organic chemistry, transesterification is the process of exchanging the organic group R″ of an ester with the organic group R′ of an alcohol. Strong acids catalyse the reaction by donating a proton to the carbonyl group, thus making it a more potent electrophile, whereas bases catalyse the reaction by removing a proton from the alcohol, thus making it more nucleophilic. In the transesterification mechanism, the carbonyl carbon of the starting ester reacts to give a tetrahedral intermediate, which either reverts to the starting material, or proceeds to the transesterified product (RCOOR2). This process has been used to recycle polyesters into individual monomers (see plastic recycling). "Iridium-catalyzed Synthesis of Vinyl Ethers from Alcohols and Vinyl Acetate", https://en.wikipedia.org/w/index.php?title=Transesterification&oldid=974408112, Creative Commons Attribution-ShareAlike License, This page was last edited on 22 August 2020, at 21:07. For example, a solid fat with mostly saturated fatty acids may be transesterified with a vegetable oil having high unsaturated acid contents, to produce a spreadable semisolid fat whose molecules have a mix both kinds of acids. In this process, water is also obtained. This conversion was one of the first uses. The con… [1] The reaction can also be accomplished with the help of enzymes (biocatalysts) particularly lipases (E.C.3.1.1.3). The largest scale application of transesterification is in the synthesis of polyesters. Step 4:Formation of the pi bond The hydroxy group’s alcohol oxygen atom donates a pair of electrons to a carbon atom which makes a π bond by eliminating water. It was patented in the US in the 1950s by Colgate, though biolipid transesterification may have been discovered much earlier. Transesterification is used to synthesize enol derivatives, which are difficult to prepare by other means. [2] In this application diesters undergo transesterification with diols to form macromolecules. Vinyl acetate, which is cheaply available, undergoes transesterification, giving access to vinyl ethers:[3][4]. […] The reverse reaction, methanolysis, is also an example of transesterification. Mechanism. The reaction takes place in acidic environments. In the transesterification mechanism, the carbonyl carbon of the starting ester reacts to give a tetrahedral intermediate, which either reverts to the starting material, or proceeds to the transesterified product (RCOOR 2).The various species exist in equilibrium, and the product distribution depends on the relative energies of the reactant and product. Esters with larger alkoxy groups can be made from methyl or ethyl esters in high purity by heating the mixture of ester, acid/base, and large alcohol and evaporating the small alcohol to drive equilibrium. For example, dimethyl terephthalate and ethylene glycol react to form polyethylene terephthalate and methanol, which is evaporated to drive the reaction forward. Table of Contents Mechanism of Esterification Esterification is a chemical reaction that occurs between the acid (usually carboxylic acid) and the alcohol (or compounds containing the hydroxyl group) where esters are obtained. Ethanoic acid reacts with ethanol in the presence of concentrated sulphuric acid as a catalyst to produce the ester, ethyl ethanoate.

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