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Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids02:04

Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids

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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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Oxidation of Alcohols02:37

Oxidation of Alcohols

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In this lesson, the oxidation of alcohols is discussed in depth. The various reagents used for oxidation of primary and secondary alcohols are detailed, and their mechanism of action is provided.
The process of oxidation in a chemical reaction is observed in any of the three forms:
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Radical Oxidation of Allylic and Benzylic Alcohols01:21

Radical Oxidation of Allylic and Benzylic Alcohols

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Activated manganese(IV) oxide can selectively oxidize allylic and benzylic alcohols via a radical intermediate mechanism. Primary allylic alcohols are oxidized to aldehydes, while secondary allylic alcohols yield ketones. The redox reaction of potassium permanganate with an Mn(II) salt such as manganese sulfate (under either alkaline or acidic conditions), followed by thorough drying, yields the oxidizing agent: activated MnO2. While MnO2 is insoluble in the solvents used for the reaction, the...
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Oxidations of Aldehydes and Ketones to Carboxylic Acids01:15

Oxidations of Aldehydes and Ketones to Carboxylic Acids

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Oxidation of aldehydes and ketones results in the formation of carboxylic acids. Aldehydes, bearing hydrogen next to the carbonyl group, are easily oxidized compared to ketones. This is because an aldehydic proton can easily be abstracted during oxidation.
Aldehydes readily undergo oxidation in strong oxidizing agents such as potassium permanganate and chromic acid. The oxidation can also be carried out using mild oxidizing agents such as silver oxide. In fact, aldehydes can be easily oxidized...
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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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Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

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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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Updated: Jul 8, 2025

Synthesis of Antiviral Tetrahydrocarbazole Derivatives by Photochemical and Acid-catalyzed C-H Functionalization via Intermediate Peroxides CHIPS
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Synthesis of Antiviral Tetrahydrocarbazole Derivatives by Photochemical and Acid-catalyzed C-H Functionalization via Intermediate Peroxides CHIPS

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Metal Activation Produces Different Reaction Environments for Intermediates during Oxidative Addition.

Erin M Hanada1, Hanyun Lou1, Patrick J McShea1

  • 1Chemistry Department, University of California, Irvine, Irvine, CA, 92697-2025, USA.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|December 18, 2023
PubMed
Summary
This summary is machine-generated.

Activating zinc metal powder impacts subsequent reaction environments. Fluorescence lifetime imaging microscopy (FLIM) reveals distinct microenvironments created by different activation methods, influencing organozinc reagent formation.

Keywords:
EnvironmentFluorescence Lifetime Imaging MicroscopyOrganozinc ReagentsOxidative AdditionReaction Mechanisms

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Area of Science:

  • Organometallic Chemistry
  • Materials Science
  • Chemical Engineering

Background:

  • Commercial zinc metal powder needs activation for consistent organozinc reagent synthesis.
  • The effect of zinc activation methods on reaction intermediates was previously unknown.

Purpose of the Study:

  • To investigate how different zinc activation methods affect the microenvironment of reaction intermediates.
  • To utilize fluorescence lifetime imaging microscopy (FLIM) to visualize these in-situ reaction environments.

Main Methods:

  • Activation of zinc metal powder using chemical agents (TMSCl, dibromoethane, HCl) and mechanical methods.
  • In-situ imaging of reaction intermediates on activated zinc using fluorescence lifetime imaging microscopy (FLIM).

Main Results:

  • Chemical activation methods produce significantly different microenvironments for oxidative-addition intermediates compared to mechanical activation.
  • FLIM detected small quantities of intermediates in-situ, revealing microenvironmental sensitivity.
  • These distinct microenvironments can influence reaction rates, solubility, and overall reactivity.

Conclusions:

  • Zinc activation methods, previously assumed to be similar, create diverse reaction environments.
  • Understanding these microenvironments is crucial for developing new methods for sluggish metal oxidative addition.
  • This study revises models for organozinc reagent formation and metal activation strategies.