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Stability of Substituted Cyclohexanes

Stability of Substituted Cyclohexanes

This lesson discusses the stability of substituted cyclohexanes with a focus on energies of various conformers and the effect of 1,3-diaxial interactions.
The two chair conformations of cyclohexanes undergo rapid interconversion at room temperature. Both forms have identical energies and stabilities, each comprising equal amounts of the equilibrium mixture. Replacing a hydrogen atom with a functional group makes the two conformations energetically non-equivalent.
For example, in...

Chair Conformation of Cyclohexane

Chair Conformation of Cyclohexane

The chair conformation is the most stable form of cyclohexane due to the absence of angle and torsional strain. The absence of angle strain is a result of cyclohexane’s bond angle being very close to the ideal tetrahedral bond angle of 109.5° in its chair conformer. Similarly, the torsional strain is also absent owing to the perfectly staggered arrangement of bonds.
The hydrogen atoms linked to carbons are arranged in two different axial and equatorial orientations to achieve this staggered...

Conformations of Cyclohexane

Conformations of Cyclohexane

Cyclohexane does not exist in a planar form due to the high angle and torsional strain it would experience in the planar structure. Instead, it adopts non-planar chair and boat conformations.
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal tetrahedral value,...

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.

Aromatic Hydrocarbon Cations: Structural Overview

Aromatic Hydrocarbon Cations: Structural Overview

Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group with both...

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,...

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Related Experiment Video

Updated: Jul 14, 2026

Preparation of a Corannulene-functionalized Hexahelicene by Copper(I)-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units

Preparation of a Corannulene-functionalized Hexahelicene by Copper(I)-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units

Published on: September 18, 2016

Revisiting the stability of hexacenes.

Rajib Mondal¹, Ravi M Adhikari, Bipin K Shah

¹Center for Photochemical Sciences, Bowling Green State University, Bowling Green, Ohio 43403, USA.

Organic Letters

|May 23, 2007

Summary

Hexacene, a challenging organic semiconductor, is highly unstable in solution but can be stabilized within a polymer matrix for over 12 hours. This finding offers new possibilities for utilizing hexacenes in materials science.

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Last Updated: Jul 14, 2026

Preparation of a Corannulene-functionalized Hexahelicene by Copper(I)-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units

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Isolating Free Carbenes, their Mixed Dimers and Organic Radicals

Isolating Free Carbenes, their Mixed Dimers and Organic Radicals

Published on: April 19, 2019

Area of Science:

Organic Chemistry
Materials Science
Photochemistry

Background:

Hexacene is a polycyclic aromatic hydrocarbon with potential applications in organic electronics.
The inherent instability of hexacene in solution has limited its practical use.
Previous synthetic methods have not overcome the stability challenges of hexacene.

Purpose of the Study:

To synthesize and characterize hexacene and its derivatives.
To investigate the stability of hexacene under various conditions.
To explore methods for stabilizing reactive organic molecules.

Main Methods:

Strating-Zwanenberg photodecarbonylation was employed for hexacene synthesis.
Quinone reduction method was used for substituted hexacene synthesis.
Stability studies were conducted in solution and within a polymer matrix.

Main Results:

Hexacene (1) was successfully prepared via photodecarbonylation.
Compound 1 exhibited extreme instability in solution, prone to dimerization and oxidation.
Stabilization of hexacene in a polymer matrix allowed survival for over 12 hours under ambient conditions.
Synthesized substituted hexacenes also demonstrated solution instability.

Conclusions:

The polymer matrix approach significantly enhances hexacene stability.
This stabilization method could enable the application of hexacenes in organic electronics.
Further research into matrix-isolated reactive species is warranted.