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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
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Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...
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SN2 substitutions and E2 eliminations of alkyl halides proceed via a concerted pathway. While the nucleophile attacks the alpha carbon in SN2 reactions, it functions as a strong base and abstracts a beta hydrogen in the E2 mechanism. The rate-limiting transition state in E2 elimination reactions is characterized by partially broken carbon–hydrogen and carbon–halogen bonds and a partially formed pi bond between the alpha and beta carbons. The beta hydrogen and halide are eliminated...
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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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Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
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Decoding the Nested, Multicycle Mechanism of Ni-Catalyzed Redox-Neutral Cross-Coupling through Temperature Scanning

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Area of Science:

  • Organic Chemistry
  • Catalysis
  • Reaction Mechanisms

Background:

  • Complex catalytic reactions often involve multiple interconnected reaction cycles.
  • Understanding these nested cycles is crucial for optimizing organic transformations.
  • Nickel-catalyzed cross-coupling reactions are vital in synthetic chemistry.

Purpose of the Study:

  • To perform a detailed mechanistic analysis of nickel-catalyzed cross-coupling of alkyl sulfonyl hydrazides with (hetero)aryl halides.
  • To investigate the concept of "kinetics matching" in nested catalytic cycles.
  • To demonstrate a predictive, kinetics-focused approach for optimizing complex catalytic reactions.

Main Methods:

  • Temperature Scanning Reaction (TSR) calorimetry coupled with Reaction Progress Kinetic Analysis (RPKA).
  • Quantitative NMR time-course analysis.
  • Kinetic modeling, linear free energy analysis, and density functional theory (DFT) calculations.

Main Results:

  • Simultaneous determination of reaction enthalpy, kinetic rate law, and activation parameters.
  • Introduction and validation of the "kinetics matching" concept.
  • Demonstration that tuning individual cycle reactivities leads to optimal yields.

Conclusions:

  • A comprehensive mechanistic understanding of nested catalytic cycles is achievable through integrated experimental and computational methods.
  • "Kinetics matching" provides a powerful strategy for optimizing yields in complex catalytic networks.
  • The presented kinetics-focused approach offers predictive capabilities for selecting optimal catalyst and substrate combinations.