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Related Concept Videos

Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate02:21

Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate

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Alkenes can be dihydroxylated using potassium permanganate.  The method encompasses the reaction of an alkene with a cold, dilute solution of potassium permanganate under basic conditions to form a cis-diol along with a brown precipitate of manganese dioxide.
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Peroxisomes01:24

Peroxisomes

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Peroxisomes are specialized organelles present in fungi, plant, and animal cells. It can vary in number, size, morphology, and activity depending on the type of tissue and the nutritional state of the cell. For example, cells with active lipid metabolism, such as adipocytes, neurons, and hepatocytes, have more peroxisomes than other cells in the body. Besides their primary role in breaking down complex organic molecules, peroxisomes can also synthesize specific macromolecules and participate in...
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Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids02:04

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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.
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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.
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A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
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Oxidation-Reduction Reactions03:11

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Oxidation–Reduction Reactions
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Vanadium-dependent haloperoxidases: Recent advances and perspectives.

Bishuang Chen1, Yongyi Zeng2, Jiangtao Sha3

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Vanadium-dependent haloperoxidases (VHPOs) are powerful enzymes for green synthesis. Recent studies reveal their mechanisms and potential for selective halogenation, advancing synthetic biology and biotechnology.

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Area of Science:

  • Biochemistry
  • Enzymology
  • Organic Synthesis

Background:

  • Vanadium-dependent haloperoxidases (VHPOs) are enzymes catalyzing halide oxidation.
  • They utilize a vanadate cofactor and hydrogen peroxide.
  • VHPOs are gaining attention for green halo-compound synthesis due to robustness and substrate tolerance.

Purpose of the Study:

  • To review the discovery, structure-function insights, and mechanistic elucidation of VHPOs.
  • To highlight recent breakthroughs in understanding VHPO specificity and catalytic mechanisms.
  • To explore the synthetic applications and future prospects of VHPOs.

Main Methods:

  • Literature review of VHPO research.
  • Analysis of structural and mechanistic studies.
  • Compilation of synthetic applications in organic chemistry.

Main Results:

  • VHPOs exhibit exceptional operational robustness and broad substrate tolerance.
  • Recent findings elucidate substrate-access tunnels and enzyme-bound halogenation mechanisms.
  • These discoveries challenge the traditional diffusible hypohalous acid (HOX) model.

Conclusions:

  • VHPOs are versatile tools for selective halogenation and sustainable synthesis.
  • Understanding VHPO mechanisms enables rational enzyme engineering.
  • VHPOs show significant promise in synthetic biology, materials science, and environmental biotechnology.