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Related Concept Videos

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids02:04

Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids

Diols are compounds with two hydroxyl groups. In addition to syn dihydroxylation, diols can also be synthesized through the process of anti dihydroxylation. The process involves treating an alkene with a peroxycarboxylic acid to form an epoxide. Epoxides are highly strained three-membered rings with oxygen and two carbons occupying the corners of an equilateral triangle. This step is followed by ring-opening of the epoxide in the presence of an aqueous acid to give a trans diol.
Preparation and Reactions of Sulfides02:26

Preparation and Reactions of Sulfides

Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
Preparation of Epoxides03:00

Preparation of Epoxides

Overview
Epoxides result from alkene oxidation, which can be achieved by a) air, b) peroxy acids, c) hypochlorous acids, and d) halohydrin cyclization.
Epoxidation with Peroxy Acids
Epoxidation of alkenes via oxidation with peroxy acids involves the conversion of a carbon–carbon double bond to an epoxide using the oxidizing agent meta-chloroperoxybenzoic acid, commonly known as MCPBA. Since the O–O bond of peroxy acids is very weak, the addition of electrophilic oxygen of peroxy acids to...
Preparation and Reactions of Thiols02:33

Preparation and Reactions of Thiols

Thiols are prepared using the hydrosulfide anion as a nucleophile in a nucleophilic substitution reaction with alkyl halides. For instance, bromobutane reacts with sodium hydrosulfide to give butanethiol.
Oxymercuration-Reduction of Alkenes02:36

Oxymercuration-Reduction of Alkenes

Oxymercuration–reduction of alkenes is one of the major reactions converting alkenes to alcohols. It involves the hydration of alkenes with mercuric acetate in a mixture of tetrahydrofuran and water, forming an organomercury adduct. This is followed by a demercuration step in which the adduct is reduced to an alcohol using sodium borohydride.

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Enzymatic Synthesis of Epoxidized Metabolites of Docosahexaenoic, Eicosapentaenoic, and Arachidonic Acids
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Oxidative dimer produced from a 2,3,4-trihydroxybenzoic ester.

Asuka Kodama1, Hidetoshi Shibano, Jun Kawabata

  • 1Laboratory of Food Biochemistry, Division of Applied Bioscience, Graduate School of Agriculture, Hokkaido University, Sapporo, Japan.

Bioscience, Biotechnology, and Biochemistry
|July 10, 2007
PubMed
Summary

Naturally occurring phenolic compounds, 2,3,4-trihydroxybenzoic acid and its methyl ester, show significant DPPH radical-scavenging abilities. Solvent choice critically impacts their efficacy, with acetonitrile enhancing the ester's performance.

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Area of Science:

  • Natural Product Chemistry
  • Antioxidant Research
  • Organic Synthesis

Background:

  • Phenolic acids are natural compounds with potential antioxidant properties.
  • The antioxidant activity of 2,3,4-trihydroxybenzoic acid and its methyl ester has not been extensively studied.
  • Solvent effects can significantly influence the radical-scavenging activity of phenolic compounds.

Purpose of the Study:

  • To evaluate the DPPH radical-scavenging abilities of 2,3,4-trihydroxybenzoic acid and its methyl ester.
  • To investigate the influence of different solvents on their radical-scavenging efficacy.
  • To explore the chemical transformations of these compounds under oxidative conditions.

Main Methods:

  • DPPH (2,2-diphenyl-1-picrylhydrazyl) radical-scavenging assay.
  • Evaluation of compounds in various organic solvents (acetonitrile, acetone, ethanol, methanol).
  • Oxidation with o-chloranil and structural elucidation of reaction products using spectroscopic methods.

Main Results:

  • Both 2,3,4-trihydroxybenzoic acid and its methyl ester demonstrated DPPH radical-scavenging activity.
  • Acetonitrile significantly enhanced the radical-scavenging capacity of both compounds compared to acetone or ethanol.
  • The methyl ester exhibited notable activity in methanol, and its oxidation yielded a novel benzocoumarin-type dimer.

Conclusions:

  • The solvent plays a crucial role in modulating the antioxidant activity of 2,3,4-trihydroxybenzoic acid and its methyl ester.
  • The formation of a benzocoumarin-type dimer from the methyl ester in acetonitrile may contribute to its enhanced radical-scavenging efficiency.
  • These findings highlight the potential of these phenolic compounds as antioxidants and the importance of solvent selection in their application.