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Related Concept Videos

Heterogeneous Catalysis01:22

Heterogeneous Catalysis

Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
Catalysis02:50

Catalysis

The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
Catalysis01:27

Catalysis

Catalysis influences the rate of chemical reactions by providing an alternative reaction pathway with lower activation energy. A catalyst speeds up a reaction, but it is not consumed during the process. The fundamental principle of catalysis is the ability of a catalyst to alter the reaction mechanism, often introducing a more efficient pathway than the uncatalyzed process.In a catalyzed reaction, the catalyst participates directly in the reaction mechanism. It interacts with reactants to form...
Regioselectivity of Electrophilic Additions-Peroxide Effect02:35

Regioselectivity of Electrophilic Additions-Peroxide Effect

In the presence of organic peroxides, the addition of hydrogen bromide to an alkene yields the isomer that is not predicted by Markovnikov’s rule. For example, the addition of hydrogen bromide to 2-methylpropene in the presence of peroxides gives 1-bromo-2-methylpropane. This addition reaction proceeds via a free radical mechanism, which reverses the regioselectivity. The free radical reaction mechanism involves three stages: initiation, propagation, and termination.
Regioselectivity and Stereochemistry of Hydroboration02:36

Regioselectivity and Stereochemistry of Hydroboration

A significant aspect of hydroboration–oxidation is the regio- and stereochemical outcome of the reaction.
Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn stereochemistry.
Radical Reactivity: Concentration Effects01:20

Radical Reactivity: Concentration Effects

In a radical reaction, the concentration of starting materials governs the selectivity of a radical. For example, the reaction between an alkyl halide and an alkene, in the presence of tin hydride and AIBN, begins with the generation of a tin radical. The generated radical then abstracts halogen from the alkyl halide, producing an alkyl radical. This alkyl radical can either react with tin hydride, yielding an alkane, or add to an alkene, generating a nitrile-stabilized radical, eventually...

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Combined effects on selectivity in Fe-catalyzed methylene oxidation.

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  • 1Department of Chemistry, Roger Adams Laboratory, University of Illinois, Urbana, IL 61801, USA.

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Summary

An iron catalyst enables selective oxidation of challenging methylene C-H bonds in natural products. This method offers predictable control over chemical reactions, complementing enzymatic catalysis for complex molecule synthesis.

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Synthetic Chemistry

Background:

  • Methylene C-H bonds are abundant yet difficult to functionalize selectively.
  • Biosynthetic pathways demonstrate the potential of selective oxidation for complex oxygenation patterns.

Purpose of the Study:

  • To develop a synthetic method for selective methylene C-H bond oxidation.
  • To achieve high chemo-, site-, and diastereoselectivity in complex molecules.
  • To explore the control elements governing selectivity in these reactions.

Main Methods:

  • Utilized an iron-based small-molecule catalyst.
  • Applied the catalyst to diverse natural product settings.
  • Investigated electronic, steric, and stereoelectronic factors influencing selectivity.

Main Results:

  • Achieved selective methylene C-H bond oxidations in various natural products.
  • Demonstrated predictable and high chemo-, site-, and diastereoselectivities.
  • Showcased the synergistic effect of combined electronic, steric, and stereoelectronic factors.

Conclusions:

  • The iron catalyst provides a powerful tool for selective methylene C-H bond functionalization.
  • This catalytic approach offers complementary selectivity to enzymatic methods.
  • The findings enable streamlined synthesis of complex oxygenated molecules.