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In ozonolysis, ozone is used to cleave a carbon–carbon double bond to form aldehydes and ketones, or carboxylic acids, depending on the work-up.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
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Aldehydes and ketones are prepared from alcohols, alkenes, and alkynes via different reaction pathways. Alcohols are the most commonly used substrates for synthesizing aldehydes and ketones. The conversion of alcohol to aldehyde, which involves the oxidation process, depends on the class of the alcohol used and the strength of the oxidizing agent. For instance, primary alcohol will form an aldehyde when treated with a weak oxidizing agent; however, it gets over-oxidized to a carboxylic acid in...
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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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In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
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Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation

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Introduction
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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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Alkane C-H functionalization and oxidation with molecular oxygen.

Dominik Munz1, Thomas Strassner1

  • 1Physikalische Organische Chemie, Technische Universität Dresden, 01069 Dresden, Germany.

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Summary

Developing robust catalysts for alkane oxidation is crucial. This study assesses three strategies: catalyst-cocatalyst systems, transition-metal catalysts, and main-group element catalysts for efficient C-H functionalization.

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Area of Science:

  • Catalysis
  • Organic Chemistry
  • Green Chemistry

Background:

  • Oxidative alkane functionalization faces challenges due to harsh conditions and dioxygen's reactivity.
  • Developing environmentally benign, cost-effective oxidation methods is essential.

Purpose of the Study:

  • To assess three main strategies for homogeneous, oxidative alkane functionalization.
  • To exemplify these strategies using specific catalyst systems.

Main Methods:

  • Review and assessment of three distinct catalytic approaches.
  • Exemplification using palladium (N-heterocyclic carbene) and vanadium cocatalysts.
  • Evaluation of cobalt catalysts for methane functionalization.
  • Analysis of group XVII compounds in alkane reactions.

Main Results:

  • The study evaluates the efficacy of combining C-H activation catalysts with dioxygen activation cocatalysts.
  • It examines transition-metal catalysts capable of reacting with both hydrocarbons and oxygen.
  • The reactivity of robust main-group element catalysts for C-H functionalization is also assessed.

Conclusions:

  • Three key strategies for robust alkane oxidation catalysis are presented.
  • The findings highlight advancements in developing efficient and selective C-H functionalization methods.
  • This work provides insights into catalyst design for sustainable chemical transformations.