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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...

Stability of Conjugated Dienes

Stability of Conjugated Dienes

Introduction
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.

Diels–Alder Reaction Forming Cyclic Products: Stereochemistry

Diels–Alder Reaction Forming Cyclic Products: Stereochemistry

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.

[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.

Stereoisomerism of Cyclic Compounds

Stereoisomerism of Cyclic Compounds

In this lesson, we delve into the role of ring conformation and its stability, which determines the spatial arrangement and, consequently, the molecular symmetry and stereoisomerism of cyclic compounds. 1,2-Dimethylcyclohexane is used as a case study to evaluate the possible number of stereoisomers. Here, given the multiple (n = 2) chiral centers, there are 2n = 4 possible configurations that lack a plane of symmetry, as the ring skeleton exists in a non-planar chair conformation. In addition,...

Diels–Alder Reaction: Characteristics of Dienes

Diels–Alder Reaction: Characteristics of Dienes

The Diels–Alder reaction brings together a diene and a dienophile to form a six-membered ring. Both components have unique characteristics that influence the rate of the reaction.
Characteristics of the diene
Conformation
The simplest example of a diene is 1,3-butadiene, an acyclic conjugated π system. At room temperature, the molecule exists as a mixture of s-cis and s-trans conformers by virtue of rotation around the carbon–carbon single bond. Although the s-trans isomer is...

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Related Experiment Video

Updated: May 26, 2025

Synthesis of a Thiol Building Block for the Crystallization of a Semiconducting Gyroidal Metal-sulfur Framework

Synthesis of a Thiol Building Block for the Crystallization of a Semiconducting Gyroidal Metal-sulfur Framework

Published on: April 9, 2018

Synthesis of the First Isolable Geminal 1,1-Dilithiostannane and Its Intriguing Structural Diversity.

Roman Bashkurov¹, Natalia Fridman¹, Dmitry Bravo-Zhivotovskii¹

¹Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Haifa, 32000, Israel.

Angewandte Chemie (International Ed. in English)

|February 25, 2025

Summary

Researchers synthesized the first isolable geminal 1,1-dilithiostannane. This novel organotin compound exhibits three distinct solid-state structural motifs based on synthesis conditions, offering new insights into organometallic chemistry.

Keywords:

aggregation dianions dilithiostannane lithium tin

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Last Updated: May 26, 2025

Synthesis of a Thiol Building Block for the Crystallization of a Semiconducting Gyroidal Metal-sulfur Framework

Synthesis of a Thiol Building Block for the Crystallization of a Semiconducting Gyroidal Metal-sulfur Framework

Published on: April 9, 2018

Isolating Free Carbenes, their Mixed Dimers and Organic Radicals

Isolating Free Carbenes, their Mixed Dimers and Organic Radicals

Published on: April 19, 2019

Synthesis and Characterization of 1,2-Dithiolane Modified Self-Assembling Peptides

Synthesis and Characterization of 1,2-Dithiolane Modified Self-Assembling Peptides

Published on: August 20, 2018

Area of Science:

Organometallic Chemistry
Solid-State Chemistry
Tin Chemistry

Background:

Organotin compounds are versatile in synthesis.
Isolating highly reactive organometallic intermediates is challenging.
Geminal dilithiated species offer unique reactivity.

Purpose of the Study:

To synthesize and characterize the first isolable geminal 1,1-dilithiostannane.
To investigate the structural diversity of this compound in the solid state.
To understand the influence of synthesis conditions on its aggregation behavior.

Main Methods:

Synthesis of geminal 1,1-dilithiostannane under varying conditions.
Solid-state structural analysis using X-ray crystallography.
Characterization of different aggregation states and solvation.

Main Results:

Successful isolation of a novel geminal 1,1-dilithiostannane.
Identification of three distinct solid-state structures: an unsolvated co-aggregate, a solvated trimeric dianion, and a solvated dimer.
Structures depend on reaction and crystallization conditions.

Conclusions:

The first isolable geminal 1,1-dilithiostannane has been synthesized.
Structural polymorphism in the solid state is demonstrated.
This work expands the understanding of organotin chemistry and reactivity.