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E2 Reaction: Stereochemistry and Regiochemistry

E2 Reaction: Stereochemistry and Regiochemistry

Elimination reactions of alkyl halides can yield one or more alkenes depending on the specific regiochemical and stereochemical considerations. While the regiochemistry of the reaction governs the location of the double bond in the product, the stereochemical requirements often influence the geometry.
When a substrate with two different β hydrogens undergoes an E2 elimination, the presence of a strong base can yield two regioisomeric alkenes. The more-substituted alkene is the major...

E1 Reaction: Stereochemistry and Regiochemistry

E1 Reaction: Stereochemistry and Regiochemistry

One of the critical aspects of the E1 reaction mechanism, as also observed in E2, is the regiochemistry, with multiple regioisomers obtained as products. In the example discussed, the presence of water as a weak base favors elimination over substitution to generate two alkenes. Given that alkenes’ stability increases with the number of alkyl groups across the double bond, typically, E1 reactions lead to the Zaitsev product, for this is more substituted and stable than the Hofmann product.

Isomerism in Alkenes

Isomerism in Alkenes

Alkenes like 1-butene and 2-butene exhibit constitutional isomerism, as they differ in the position of the double bond. Further, 2-butene exhibits stereoisomerism and exists as two distinct compounds differing in spatial arrangement.
An isomer is called cis-2-butene when the methyl groups are on the same side of the double bond, and the other stereoisomer, in which methyl groups are on the opposite side of the double bond, is called trans-2-butene. The cis and trans stereoisomers are not...

Electrophilic Addition to Alkynes: Hydrohalogenation

Electrophilic Addition to Alkynes: Hydrohalogenation

Electrophilic addition of hydrogen halides, HX (X = Cl, Br or I) to alkenes forms alkyl halides as per Markovnikov's rule, where the hydrogen gets added to the less substituted carbon of the double bond. Hydrohalogenation of alkynes takes place in a similar manner, with the first addition of HX forming a vinyl halide and the second giving a geminal dihalide.

Thermal Electrocyclic Reactions: Stereochemistry

Thermal Electrocyclic Reactions: Stereochemistry

The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.

Structures of Carboxylic Acid Derivatives

Structures of Carboxylic Acid Derivatives

Structure of Carboxylic Acid Derivatives
Carboxylic acid derivatives contain an acyl group attached to a heteroatom such as chlorine, oxygen, or nitrogen. The carbonyl carbon and oxygen are both sp2-hybridized with an unhybridized p orbital.
The three sp2 orbitals of the carbonyl carbon form three σ bonds, one each with the carbonyl oxygen, the α carbon, and the heteroatom, whereas the other two sp2 orbitals of the carbonyl oxygen are occupied by the lone pairs. Further, the unhybridized p...

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Related Experiment Video

Updated: Feb 28, 2026

Facile Preparation of 2Z,4E-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate

Facile Preparation of 2Z,4E-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate

Published on: June 21, 2017

E/Z Isomerization-Enabled Conversion from Dual-Carbon to Single-Carbon Insertion into an Aromatic System.

Kaiyue Zhuo¹, Kaidong Ruan¹, Fei-Hu Cui^1,2

¹College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.

|February 27, 2026

Summary

This study introduces a novel method for skeletal modification of aromatic systems using tunable dual-to-single carbon insertion. E/Z isomerization controls alkyne insertion pathways, enabling divergent molecular diversity from identical reagents.

Keywords:

Carbon insertion Cycloaddition E/Z isomerization Metallaaromatics Skeletal modification

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Facile Preparation of 2Z,4E-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate

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Efficient Synthesis of All-Carbon Quaternary Centers via the Conjugate Addition of Functionalized Monoorganozinc Bromides

Efficient Synthesis of All-Carbon Quaternary Centers via the Conjugate Addition of Functionalized Monoorganozinc Bromides

Published on: May 26, 2019

Area of Science:

Organic Chemistry
Synthetic Chemistry
Catalysis

Background:

Generating molecular diversity through skeletal modification of aromatic systems is crucial but challenging.
Existing methods often require diverse strategies and starting materials.

Purpose of the Study:

To report a tunable dual-to-single carbon insertion method into σ-aromatic metalla-cyclopropenes.
To establish a new paradigm for temporal control in divergent skeletal editing.

Main Methods:

Utilizing E/Z isomerization of intermediates to control reaction pathways.
Employing alkyne insertion into a three-membered ring via [3+2] and [3+1] pathways.
Modulating reaction selectivity by controlling the timing of alkyne addition.

Main Results:

Achieved tunable dual-carbon insertion via the E-isomer and single-carbon insertion via the Z-isomer.
Demonstrated divergent skeletal editing from identical reagents.
Highlighted the critical role of E/Z isomerization in controlling reaction outcomes.

Conclusions:

The developed method offers a versatile approach for skeletal modification.
Temporal control via E/Z isomerization provides a new strategy for synthetic chemistry.
This work expands the toolkit for creating molecular diversity in aromatic systems.