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Stability of Substituted Cyclohexanes

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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.
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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Cycloalkanes

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Cycloalkanes are saturated cyclic hydrocarbons with carbon atoms arranged in the form of rings. They have two fewer hydrogen atoms than the corresponding acyclic alkane; therefore, their general formula is CnH2n. The structural formulas of cycloalkanes are simplified using the line-angle representation. The regular polygons are used to represent the cycloalkane rings, with each side representing a carbon-carbon bond.
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Aromatic Hydrocarbon Cations: Structural Overview01:18

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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.
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Alkynes are unsaturated hydrocarbons characterized by the presence of carbon-carbon triple bonds and have a general formula CnH2n-2. The nomenclature of alkynes follows a set of rules similar to alkanes and alkenes; however, alkynes bear the suffix "-yne" instead of "-ane" or "-ene." There are two approaches to naming alkynes:
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Depending upon the different spatial orientation of the substituents, the disubstituted cycloalkanes exhibit two types of stereoisomers. The cis isomers have the substituents on the same side of the ring, whereas the trans isomers have the substituents on the opposite sides. These stereoisomers exhibit different physical properties and cannot be interconverted without breaking the carbon-carbon bonds.
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Parent, Unsubstituted Corrphycene: Synthesis and Properties.

Arkadiusz Listkowski1,2, Magdalena Piechocka1, Michał Kijak2

  • 1Faculty of Mathematics and Science, Cardinal Stefan Wyszyński University in Warsaw, Dewajtis 5, Warsaw, 01-815, Poland.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|April 14, 2025
PubMed
Summary

We synthesized unsubstituted corrphycene (Cp), a porphyrin isomer, revealing its soft chromophore properties and electronic structure. This finding opens new avenues for environmental sensing applications.

Keywords:
corrhyceneporphyrin isomerstautomerism

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Area of Science:

  • Organic Chemistry
  • Photochemistry
  • Spectroscopy

Background:

  • Porphyrin isomers are crucial in various chemical and biological processes.
  • Unsubstituted corrphycene (Cp) has been challenging to synthesize and characterize.
  • Understanding Cp's electronic and structural properties is key to its applications.

Purpose of the Study:

  • To report the synthesis and characterization of unsubstituted corrphycene (Cp).
  • To investigate the structural, spectral, and electrochemical properties of Cp.
  • To explore the potential of Cp as a sensing material.

Main Methods:

  • Synthesis of unsubstituted corrphycene (Cp) and its precursor.
  • Structural analysis using X-ray crystallography and spectroscopy (UV-Vis, MCD).
  • Electrochemical characterization (cyclic voltammetry).
  • Density Functional Theory (DFT) calculations for comparison.

Main Results:

  • Successful synthesis of unsubstituted corrphycene (Cp).
  • Cp exhibits characteristics of a soft chromophore, similar to porphine.
  • Magnetic circular dichroism (MCD) spectra reveal larger HOMO than LUMO orbital splitting, contradicting DFT predictions.
  • Corrphycene exists as a doubly degenerate trans tautomeric species with inequivalent intramolecular H-bonds, suggesting a stepwise conversion mechanism.

Conclusions:

  • Unsubstituted corrphycene (Cp) is a stable, synthesizable porphyrin isomer.
  • Cp's electronic structure and soft chromophore nature make it suitable for sensing applications.
  • The observed tautomeric behavior provides insights into molecular dynamics and hydrogen bonding.