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Radical Reactivity: Overview01:11

Radical Reactivity: Overview

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Radicals, the highly reactive species, gain stability by undergoing three different reactions. The first reaction involves a radical-radical coupling, in which a radical combines with another radical, forming a spin‐paired molecule. The second reaction is between a radical and a spin‐paired molecule, generating a new radical and a new spin‐paired molecule. The third reaction is radical decomposition in a unimolecular reaction, forming a new radical and a spin‐paired...
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Cycloaddition Reactions: Overview01:16

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Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
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Pericyclic Reactions: Introduction01:17

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Pericyclic reactions are organic reactions that occur via a concerted mechanism without generating any intermediates. The reactions proceed through the movement of electrons in a closed loop to form a cyclic transition state, where rearrangement of the σ and π bonds yields specific products.
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The Cope rearrangement is classified as a [3,3] sigmatropic shift in 1,5-dienes, leading to a more stable, isomeric 1,5-diene. The reaction involves a concerted movement of six electrons, four from two π bonds and two from a σ bond, via an energetically favorable chair-like transition state.
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E1 Reaction: Kinetics and Mechanism02:46

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Here, in contrast to the E2 reaction mechanism, we delve into the aspects of the E1 reaction mechanism, which has two steps: rate-limiting loss of the leaving group and abstraction of the beta hydrogen by a weak base. Typically, the experimental proof for the E1 mechanism is via kinetic studies or isotope studies. While the former demonstrates the first-order kinetics—the dependence of the reaction solely on substrate concentration—the latter proves the abstraction of hydrogen only...
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Understanding and Controlling Reactivity Patterns of Pd1@C3N4-Catalyzed Suzuki-Miyaura Couplings.

Marc Eduard Usteri1, Georgios Giannakakis1, Aram Bugaev2

  • 1Department of Chemistry and Applied Biosciences, Institute of Chemical and Bioengineering, ETH Zurich, Vladimir-Prelog-Weg 1, Zurich 8093, Switzerland.

ACS Catalysis
|August 22, 2024
PubMed
Summary

This study reveals how single-atom catalysts (SACs) like Pd1@C3N4 function in Suzuki-Miyaura coupling. Optimizing solvent, base, and ligand interactions is key for efficient and selective catalysis, advancing green chemistry.

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Area of Science:

  • Heterogeneous catalysis
  • Sustainable organic synthesis
  • Materials science

Background:

  • Palladium complexes are traditional catalysts for Suzuki-Miyaura coupling (SMC).
  • Single-atom catalysts (SACs) offer economic and environmental advantages but lack mechanistic understanding.
  • Pd1@C3N4 is a promising SAC for SMC.

Purpose of the Study:

  • To elucidate the reaction mechanism of Pd1@C3N4 in SMC.
  • To identify key factors influencing catalyst performance and selectivity.
  • To guide the rational design of SACs for organic reactions.

Main Methods:

  • Computational modeling and in situ X-ray Absorption Spectroscopy (XAS).
  • Systematic variation of reaction parameters (base, ligand, solvent).
  • Analysis of catalyst-ligand-base interactions and reaction pathways.

Main Results:

  • Base, ligand, and solvent critically influence interface formation, Pd activation, and competing pathways.
  • Optimizing base strength, solubility, and wetting mitigates mass transfer limitations.
  • Minimizing base and ligand coordination to Pd enhances selectivity and avoids side reactions.
  • In situ XAS confirmed computational hypotheses on Pd electronic structure and coordination.

Conclusions:

  • Understanding the interplay of reaction media is crucial for SAC performance and reusability.
  • Ligand-free pathways can be designed by modulating the chemical environment with solvent and base.
  • This work advances SAC design for efficient and selective organic liquid-phase reactions.