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Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.

Hydroboration-Oxidation of Alkenes

Hydroboration-Oxidation of Alkenes

In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.

Diels–Alder Reaction Forming Cyclic Products: Stereochemistry

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The Diels–Alder reaction is one of the robust methods for synthesizing unsaturated six-membered rings. The reaction involves a concerted cyclic movement of six π electrons: four π electrons from the diene and two π electrons from the dienophile.

Structure of Conjugated Dienes

Structure of Conjugated Dienes

Introduction
Conjugated dienes are compounds characterized by the presence of alternating double and single bonds. In a conjugated system like 1,3-butadiene, the unhybridized 2p orbital on each carbon overlaps continuously, allowing the π electrons to be delocalized across the entire molecule. In contrast, this type of overlap does not occur in cumulated and isolated dienes, such as 2,3-pentadiene and 1,4-pentadiene, respectively. Instead, the π electrons remain localized between the double...

Regioselectivity and Stereochemistry of Hydroboration

Regioselectivity and Stereochemistry of Hydroboration

A significant aspect of hydroboration–oxidation is the regio- and stereochemical outcome of the reaction.
Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn stereochemistry.

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

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Direct Interconversion between Bis(borylenes) and Diborenes.

Sourav Kar^1,2, Koushik Saha^1,2, Vailappully Binilkrishna^1,2

¹Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany.

Journal of the American Chemical Society

|November 18, 2025

Summary

This summary is machine-generated.

Researchers report novel ferrocene-based borylene systems. A unique diborene formed from bis(borylene) reversibly dissociates, demonstrating a Wanzlick-type equilibrium crucial for borylene chemistry.

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Area of Science:

Organometallic Chemistry
Carbene Chemistry
Boron Chemistry

Background:

Borylenes and diborenes are key boron compounds with limited understanding of their equilibrium.
Wanzlick-type equilibria between low-coordinate boron species and their dimers are not well-established.

Purpose of the Study:

To synthesize and characterize novel ferrocene-based borylene and diborene systems.
To investigate the Wanzlick-type equilibrium between borylenes and diborenes using ferrocene scaffolds.
To explore the reactivity and properties of these unique organoboron compounds.

Main Methods:

Synthesis of cyclic (alkyl)(amino)carbene (CAAC)-stabilized ferrocene-based borylenes.
Characterization of mono- and disubstituted ferrocene borylene systems.
Investigation of intramolecular C-H, CO, and H2 activation reactions.
Analysis of the reversible coupling and decoupling between bis(borylene) and diborene species.

Main Results:

Reported CAAC-stabilized mono- and disubstituted ferrocene-based borylenes.
Observed intramolecular C-H, CO, and H2 activation in monosubstituted borylenes.
Synthesized a diborene from a disubstituted ferrocene bis(borylene) featuring a delocalized four-center-two-electron (4c-2e) π bond.
Demonstrated reversible dissociation of the diborene back to bis(borylene), establishing a Wanzlick-type equilibrium.

Conclusions:

The ferrocene scaffold's electronic and rotational flexibility facilitates reversible bis(borylene)-diborene coupling.
The observed reversible equilibrium provides direct evidence for Wanzlick-type behavior in borylene chemistry.
Ferrocenyl diborene species exhibit unique photophysical, redox, and reactive properties.