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Related Concept Videos

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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Oxidative Cleavage of Alkenes: Ozonolysis01:46

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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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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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Radical Autoxidation01:20

Radical Autoxidation

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The oxidation of an organic compound in the presence of air or oxygen is called autoxidation. For example, cumene reacts with oxygen to form hydroperoxide. Autoxidation involves initiation, propagation, and termination steps. Many organic compounds are susceptible to autoxidation—especially ethers in the presence of oxygen, which form hydroperoxides. Even though this reaction is slow, old ether bottles contain small amounts of peroxide, which leads to laboratory explosions during ether...
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Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation01:28

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Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...
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Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

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Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
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A bioinspired model for copper monooxygenase: direct aromatic hydroxylation using O2.

Ramamoorthy Ramasubramanian1,2, Karunanithi Anandababu1,2, Mukesh Kumar3

  • 1Department of Chemistry, Indian Institute of Technology Bhilai, Bhilai, Durg 491002, Chattisgarh, India. murugan@iitbhilai.ac.in.

Dalton Transactions (Cambridge, England : 2003)
|May 6, 2025
PubMed
Summary

A novel copper(I) complex effectively hydroxylates benzene to phenol using dioxygen or hydrogen peroxide. This bioinspired catalyst shows enhanced activity with H2O2, forming a key copper-peroxo intermediate.

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Area of Science:

  • Bioinorganic Chemistry
  • Catalysis
  • Coordination Chemistry

Background:

  • Copper monooxygenases are crucial enzymes in biological systems.
  • Developing synthetic models for these enzymes aids in understanding their mechanisms.
  • Bioinspired copper complexes offer potential for selective oxidation reactions.

Purpose of the Study:

  • To synthesize and characterize a novel copper(I) complex as a bioinspired model for copper monooxygenases.
  • To investigate the catalytic activity of the copper(I) complex in benzene hydroxylation.
  • To elucidate the mechanism of benzene hydroxylation using various oxygen sources and spectroscopic techniques.

Main Methods:

  • Synthesis and characterization of copper(I) and copper(II) complexes.
  • Aerobic and peroxide-driven benzene hydroxylation reactions.
  • Electron Paramagnetic Resonance (EPR) spectroscopy.
  • Fourier-transform infrared (FT-IR) spectroscopy.
  • Density Functional Theory (DFT) calculations.
  • Kinetic Isotope Effect (KIE) studies.

Main Results:

  • A novel copper(I) complex ([Cu(L)(CH3CN)]CF3SO3) was synthesized and characterized.
  • The copper(I) complex selectively hydroxylates benzene to phenol, with significantly enhanced yield (19%) using H2O2 compared to O2 (7%).
  • Spectroscopic and DFT studies identified a key copper-peroxo intermediate ([(L)CuII-OOH]+) responsible for hydroxylation.
  • Dicopper complexes showed poor catalytic activity and produced byproducts.

Conclusions:

  • The synthesized copper(I) complex serves as an effective bioinspired model for copper monooxygenases.
  • Hydrogen peroxide significantly enhances the catalytic efficiency of benzene hydroxylation via a copper-peroxo intermediate.
  • The study provides mechanistic insights into copper-catalyzed hydroxylation reactions.