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Nucleophiles

Nucleophiles

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...

Predicting Products: SN1 vs. SN2

Predicting Products: S_N1 vs. S_N2

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,...

Electrophiles

Electrophiles

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.
While a positive electrophile, like a proton, reacts due to its vacant, low-energy 1s orbital, the...

Nucleophilic Substitution Reactions

Nucleophilic Substitution Reactions

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...

SN2 Reaction: Kinetics

S_N2 Reaction: Kinetics

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...

Regioselectivity of Electrophilic Additions to Alkenes: Markovnikov's Rule

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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.
The hydrohalogenation of an unsymmetrical alkene can yield two haloalkane products, depending on which vinylic carbon takes up the halogen. However, one product usually predominates, where hydrogen adds to the vinylic carbon bearing the...

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Un principio de nucleofilia máxima basado en la teoría funcional de la densidad conceptual

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

Resumen

Este resumen es generado por máquina.

Proponemos un principio de nucleofilia máxima (MNP) utilizando la teoría funcional de la densidad conceptual (CDFT). Este nuevo principio, análogo al principio de electrophilicidad mínima (MEP), ayuda a comprender la transferencia de electrones en las reacciones químicas.

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Área de la Ciencia:

Química Cuántica
Química teórica
Teoría de la reactividad química

Sus antecedentes:

La Teoría Funcional de Densidad Conceptual (CDFT) proporciona un marco para comprender la reactividad química.
El principio de electrofilia mínima (MEP) se ha establecido como un concepto clave para las especies electrofílicas.
Una comprensión completa del comportamiento nucleófilo requiere un principio complementario.

Objetivo del estudio:

Introducir una formulación variacional de la nucleofilicidad dentro del CDFT.
Proponer un principio de nucleofilia máxima (PNM) análogo al del PE.
Desarrollar y validar un nuevo índice de nucleofilidad global (N_G).

Principales métodos:

Utilizando una expansión de Taylor de tercer orden de la energía electrónica con respecto al número de electrones.
Extender el índice de nucleofilicidad global (N_G) basado en el potencial químico, la dureza y la hiperdureza.
Derivando una expresión diferencial funcional explícita para N_G[N, v(r) ].

Principales resultados:

Se demostró que el índice N_G satisface una condición variacional para los procesos de pérdida de electrones.
Desarrolló una descripción termodinámica consistente del comportamiento nucleófilo.
Evaluado el MNP a través de seis reacciones de referencia.

Conclusiones:

El principio de nucleofilia máxima (MNP) se introduce como un concepto válido en el CDFT.
MNP y MEP sirven como herramientas complementarias para analizar la transferencia de electrones y la reactividad química.
El estudio proporciona un marco teórico sólido para la comprensión de las reacciones nucleófilas.