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Related Concept Videos

Nucleophiles02:30

Nucleophiles

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The word “nucleophile” has a Greek root and translates to nucleus-loving. Nucleophiles are either negatively charged or neutral species with a pair of electrons in a high-energy occupied molecular orbital (HOMO). As these species tend to donate electron pairs, nucleophiles are considered Lewis bases as well. Negatively charged species, like OH−, Cl−, or HS−, with one or several pairs of electrons, are typically nucleophiles. Similarly, neutral species such as...
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Nucleophilic substitution reactions of alkyl halides can proceed via an SN1 or an SN2 mechanism. While in SN2 reactions, the nucleophile attacks the substrate simultaneously as the leaving group departs, in SN1 reactions, the substrate first dissociates to give the carbocation intermediate. Various factors such as the structure of the substrate, the strength of the nucleophile, and the nature of the solvent promote one mechanism over the other.
With increased substitution on the alkyl halide,...
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Electrophiles02:28

Electrophiles

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This lesson explains the definition, classification, and characteristic features of an electrophile that are key features of nucleophilic substitution reactions. An analysis of their charge and orbital picture helps understand their reactivity for seeking electrons. Electrophiles can be classified into positive and neutral species. Other classes include free radicals and polar functional groups.
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Nucleophilic Substitution Reactions02:34

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Historical perspective
In 1896, the German chemist Paul Walden discovered that he could interconvert pure enantiomeric (+) and (-) malic acids through a series of reactions. This conversion suggested the involvement of optical inversion during the substitution reaction. Further, in 1930, Sir Christopher Ingold described for the first time two different forms of nucleophilic substitution reactions, which are known as SN1 (nucleophilic substitution unimolecular) and SN2 (nucleophilic substitution...
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SN2 Reaction: Kinetics02:14

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Kinetic Studies and Significance
In a chemical reaction, a relationship exists between the concentration of reactants and the rate at which the reaction proceeds. The study to measure this relationship is known as the kinetics of a chemical reaction. Kinetic studies are used to deduce the rate law of a chemical reaction, which provides information about the species involved during the transition state of the rate-determining step. Thus, kinetic studies help to derive the mechanism of a...
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Regioselectivity of Electrophilic Additions to Alkenes: Markovnikov's Rule02:17

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If a set of reactants can yield multiple constitutional isomers, but one of the isomers is obtained as the major product, the reaction is said to be regioselective. In such reactions, bond formation or breaking is favored at one reaction site over others.
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A New Straightforward Method for Lipophilicity logP Measurement using 19F NMR Spectroscopy
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A Conceptual Density Functional Theory-Based Maximum Nucleophilicity Principle.

Olivier Aroule1, Christophe Morell1, Henry Chermette1

  • 1Université de Lyon, Institut des Sciences Analytiques, UMR 5280, CNRS, Université Lyon 1-5, Rue de la Doua, F-69100 Villeurbanne, France.

The Journal of Physical Chemistry. A
|September 3, 2025
PubMed
Summary
This summary is machine-generated.

We propose a maximum nucleophilicity principle (MNP) using conceptual density functional theory (CDFT). This new principle, analogous to the minimum electrophilicity principle (MEP), helps understand electron transfer in chemical reactions.

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Area of Science:

  • Quantum Chemistry
  • Theoretical Chemistry
  • Chemical Reactivity Theory

Background:

  • Conceptual Density Functional Theory (CDFT) provides a framework for understanding chemical reactivity.
  • The minimum electrophilicity principle (MEP) has been established as a key concept for electrophilic species.
  • A comprehensive understanding of nucleophilic behavior requires a complementary principle.

Purpose of the Study:

  • To introduce a variational formulation of nucleophilicity within CDFT.
  • To propose a maximum nucleophilicity principle (MNP) analogous to the MEP.
  • To develop and validate a new global nucleophilicity index (NG).

Main Methods:

  • Utilizing a third-order Taylor expansion of electronic energy with respect to electron number.
  • Extending the global nucleophilicity index (NG) based on chemical potential, hardness, and hyperhardness.
  • Deriving an explicit functional differential expression for NG[N, v(r)].

Main Results:

  • Demonstrated that the NG index satisfies a variational condition for electron-loss processes.
  • Developed a thermodynamically consistent description of nucleophilic behavior.
  • Evaluated the MNP across six benchmark reactions.

Conclusions:

  • The maximum nucleophilicity principle (MNP) is introduced as a valid concept in CDFT.
  • MNP and MEP serve as complementary tools for analyzing electron transfer and chemical reactivity.
  • The study provides a robust theoretical framework for understanding nucleophilic reactions.