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植物がリモノイド生物合成で保護/脱保護戦略を活用する"欠けているリンク"カルボキシルエステラーゼは収穫を増やし,フーラン形成の洞察を提供します

  • 0Department of Biochemistry and Metabolism, John Innes Centre, Norwich Research Park, Norwich NR4 7UH, U.K.
Journal of the American Chemical Society +

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2024年10月17日

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Protection of Alcohols 02:31

7.2K

This lesson delves into the concept of protection and deprotection of a functional group fundamental to synthetic organic chemistry. These phenomena are explained in the context of aliphatic and aromatic alcohols.
Protection
It defines a protecting group as the masking agent to make the more reactive species inert to a given set of conditions. This concept is depicted via the illustration of liquid flow through different outlets in an assembly of pipes. The analogy helps to understand the role...

Protecting Groups for Aldehydes and Ketones: Introduction 01:23

6.7K

Protecting groups are compounds that can bind to a specific functional group in the presence of other functional groups to protect them from undesired chemical reactions. These compounds can selectively bind to particular functional groups and advance chemoselective reactions in polyfunctional systems (Figure 1). After the functional group has served its purpose, it is removed by reacting it with specific compounds.

The aldehydes and ketones can be selectively protected in the presence of...

Carboxylic Acids to Esters: Acid-Catalyzed (Fischer) Esterification Overview 01:20

17.8K

The Fischer esterification reaction was developed by the German chemist Emil Fischer in 1895. It is a condensation reaction between carboxylic acids and alcohols in an acidic medium to give esters and water.

Hydroxy-functionalized carboxylic acids undergo intramolecular Fischer esterification to form lactones. The cyclic five- and six-membered lactones are formed spontaneously.

The reaction rate of Fischer esterification is greatly dependent on steric factors. Primary alcohols react fastest...

Biosynthesis of Lipids 01:29

1

Microbial membranes exhibit remarkable diversity in lipid composition, reflecting evolutionary adaptations to various environmental conditions. The three domains of life—Bacteria, Archaea, and Eukarya—synthesize membrane lipids through distinct biosynthetic pathways, leading to fundamental structural differences that impact membrane stability, function, and adaptability.Fatty Acid-Based Lipids in Bacteria and EukaryaBacteria and eukaryotes share a common fatty acid biosynthesis...

Carboxylic Acids to Esters: Acid-Catalyzed (Fischer) Esterification Mechanism 01:13

7.8K

Carboxylic acids react with alcohols to yield esters via an acid-catalyzed condensation reaction called Fischer esterification. This is a nucleophilic acyl substitution reaction that proceeds via a tetrahedral intermediate, where a water molecule is eliminated as the leaving group.

The mechanism of this reaction was confirmed by Robert and Urey (1938) through a radioisotope labeling experiment, where esterification of a carboxylic acid was carried out using 18O-labeled alcohol. The...

Acetals and Thioacetals as Protecting Groups for Aldehydes and Ketones 01:24

4.1K

Acetals are formed by reacting two equivalents of alcohol with carbonyl compounds like aldehydes or ketones. Acetals are unaffected by bases, nucleophiles, oxidizing agents, and reducing agents. They serve as protecting groups for aldehydes and ketones. Acetals can be easily formed and also easily removed via mild acid hydrolysis.
In the presence of multiple functional groups, when selective reduction of one group over the other is desired, groups like aldehydes and ketones that form acetals...