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Reactions at the Benzylic Position: Halogenation

Reactions at the Benzylic Position: Halogenation

Benzylic halogenation takes place under conditions that favor radical reactions such as heat, light, or a free radical initiator like peroxide.

Reactions at the Benzylic Position: Oxidation and Reduction

Reactions at the Benzylic Position: Oxidation and Reduction

The benzylic position describes the position of a carbon atom attached directly to a benzene ring. Benzene by itself does not undergo oxidation. In contrast, the benzylic carbon is quite reactive in the presence of strong oxidizing agents such as KMnO4 or H2CrO4. Therefore, alkylbenzenes are readily oxidized to benzoic acid, irrespective of the type of alkyl groups.

Bond Energies and Bond Lengths

Bond Energies and Bond Lengths

Stable molecules exist because covalent bonds hold the atoms together. The strength of a covalent bond is measured by the energy required to break it, that is, the energy necessary to separate the bonded atoms. Separating any pair of bonded atoms requires energy — the stronger a bond, the greater the energy required to break it.

Peptide Bonds

Peptide Bonds

A peptide bond covalently attaches amino acids through a dehydration reaction. One amino acid's carboxyl group and another amino acid's amino group combine, releasing a water molecule. The resulting bond is the peptide bond. The products that such linkages form are peptides. As more amino acids join this growing chain, the resulting chain is a polypeptide. Each polypeptide has a free amino group at one end. This end has the N-terminal, or the amino-terminal, and the other end has a free...

C–C Bond Cleavage: Retro-Aldol Reaction

C–C Bond Cleavage: Retro-Aldol Reaction

The reverse of the aldol addition reaction is called the retro-aldol reaction. Here, the carbon–carbon bond in the aldol product is cleaved under acidic or basic conditions to form two molecules of carbonyl compounds. The mechanism of the reaction consists of three steps.
In the first step, as depicted in Figure 1, the base deprotonates the β-hydroxy ketone at the hydroxyl group to form an alkoxide ion.

Phase I Reactions: Oxidation of Aliphatic and Aromatic Carbon-Containing Systems

Phase I Reactions: Oxidation of Aliphatic and Aromatic Carbon-Containing Systems

Phase I biotransformation reactions are integral to drug metabolism, predominantly involving oxidative, reductive, and hydrolytic transformations. Chief among these are oxidative reactions, which enhance the hydrophilicity of xenobiotics and introduce polar functional groups to facilitate their elimination from the body.
Oxidation reactions are fundamental in aromatic carbon-containing systems. An example is the hydroxylation of phenobarbital, a process that transforms it into...

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Related Experiment Video

Updated: Jan 20, 2026

Palladium N-Heterocyclic Carbene Complexes: Synthesis from Benzimidazolium Salts and Catalytic Activity in Carbon-carbon Bond-forming Reactions

Palladium N-Heterocyclic Carbene Complexes: Synthesis from Benzimidazolium Salts and Catalytic Activity in Carbon-carbon Bond-forming Reactions

Published on: July 30, 2017

Multicomponent Aromatic and Benzylic Mannich Reactions through C-H Bond Activation.

Tania Xavier¹, Corinne Rayapin¹, Erwan Le Gall¹

¹Électrochimie et Synthèse Organique, Université Paris Est, ICMPE (UMR 7182), CNRS, UPEC, 2-8 rue Henri Dunant, 94320, Thiais, France.

Chemistry (Weinheim an Der Bergstrasse, Germany)

|August 15, 2019

Summary

Multicomponent Mannich reactions efficiently create complex amines via C-H bond activation. This method utilizes transient organometallic species and in situ generated imines for high-yield synthesis.

Keywords:

C−H activation Mannich reactions multicomponent reactions synthetic methods

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Published on: May 12, 2023

Area of Science:

Organic Chemistry
Catalysis
Synthetic Methodology

Background:

C-H bond activation offers a powerful strategy for molecular construction.
Developing efficient multicomponent reactions remains a key challenge in organic synthesis.

Purpose of the Study:

To develop novel multicomponent Mannich reactions utilizing C-H bond activation.
To achieve straightforward synthesis of densely substituted benzylic and homo-benzylic amines.

Main Methods:

Employing transition-metal-catalyzed sp2 or sp3 C-H bond activation.
Utilizing in situ generated imines and acetals as aldehyde surrogates.
Investigating Rh(III)-catalyzed sp2 C-H functionalization and Cu(II)-catalyzed sp3 C-H functionalization.

Main Results:

Successful generation of densely substituted benzylic and homo-benzylic amines in good yields.
Demonstrated the essential role of acetals as aldehyde surrogates.
Extended the methodology to both Rh(III)-catalyzed sp2 and Cu(II)-catalyzed sp3 C-H functionalization.

Conclusions:

Established a versatile multicomponent Mannich reaction strategy.
Provided an efficient route to valuable amine building blocks.
Highlighted the broad applicability of C-H activation in complex molecule synthesis.