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Carbocations

Carbocations

Carbocations are one of the reaction intermediates formed during several nucleophilic substitutions or elimination reactions. A carbocation is an electron-deficient species with the central carbon atom having six electrons and three bonded atoms. The central carbon in a carbocation is sp2 hybridized with trigonal planar geometry. It has an empty p orbital perpendicular to the plane of the structure that can accept electrons. Thus, carbocations act as strong electrophiles and may react with any...

Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration

Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration

The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.

Regioselectivity of Electrophilic Additions to Alkenes: Markovnikov's Rule

Regioselectivity of Electrophilic Additions to Alkenes: Markovnikov's Rule

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...

SN2 Reaction: Transition State

S_N2 Reaction: Transition State

An SN2 reaction of an alkyl halide is a single-step process in which bond formation between the nucleophile and the substrate and bond breaking between the substrate and the halide occurs simultaneously through a transition state without forming an intermediate.
When the nucleophile approaches the electrophilic carbon with its lone pairs, the halide acts as a leaving group and moves away with the electron-pair bonded to the carbon. Dotted partial bonds represent the bonds being formed or broken...

SN1 Reaction: Stereochemistry

S_N1 Reaction: Stereochemistry

This lesson provides an in-depth discussion of the stereochemical outcomes in an SN1 reaction.
In the first step of an SN1 reaction, the bond between the electrophilic carbon and the leaving group ionizes to generate the carbocation intermediate. The second step of the mechanism is the nucleophilic attack.
In the formed carbocation, the positively charged carbon is sp2 hybridized with a trigonal planar geometry. As all the three substituents lie on the same plane, a plane of symmetry for the...

Reactions of α-Halocarbonyl Compounds: Nucleophilic Substitution

Reactions of α-Halocarbonyl Compounds: Nucleophilic Substitution

Nucleophilic substitution in α-halocarbonyl compounds can be achieved via an SN2 pathway. The reaction in α-haloketones is generally carried out with less basic nucleophiles. The use of strong basic nucleophiles leads to the generation of α-haloenolate ions, which often participate in other side reactions.

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Updated: Nov 23, 2025

Versatile CO2 Transformations into Complex Products: A One-pot Two-step Strategy

Versatile CO2 Transformations into Complex Products: A One-pot Two-step Strategy

Published on: November 9, 2019

Dynamic Effects on Migratory Aptitudes in Carbocation Reactions.

Zhitao Feng¹, Dean J Tantillo¹

¹Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, California 95616, United States.

Journal of the American Chemical Society

|January 5, 2021

Summary

Carbocation rearrangement reactions are vital in chemistry. Dynamic effects, not just static factors, significantly influence how carbocations migrate, impacting synthetic and biosynthetic pathways.

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Last Updated: Nov 23, 2025

Versatile CO2 Transformations into Complex Products: A One-pot Two-step Strategy

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Published on: November 9, 2019

Isolating Free Carbenes, their Mixed Dimers and Organic Radicals

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Highly Stereoselective Synthesis of 1,6-Ketoesters Mediated by Ionic Liquids: A Three-component Reaction Enabling Rapid Access to a New Class of Low Molecular Weight Gelators

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Published on: November 27, 2015

Area of Science:

Organic Chemistry
Computational Chemistry

Background:

Carbocation rearrangements are fundamental in organic synthesis and biosynthesis.
Understanding migratory aptitude is crucial for predicting reaction outcomes.

Purpose of the Study:

To develop a scale of inherent migratory aptitude considering dynamic effects.
To investigate competing migration events in a model carbocation system.

Main Methods:

Utilized uphill and downhill *ab initio* molecular dynamics (AIMD) simulations.
Analyzed potential energy surface topography.
Employed variational transition state theory calculations.

Main Results:

Identified the significant role of nonstatistical dynamic effects in migratory aptitude.
Demonstrated that dynamic factors beyond static biases are critical for understanding carbocation behavior.

Conclusions:

Migratory aptitude is influenced by dynamic effects beyond traditional steric and electronic considerations.
Computational methods like AIMD provide crucial insights into reaction mechanisms.