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Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

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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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¹H NMR of Conformationally Flexible Molecules: Temporal Resolution00:52

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At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
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¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR01:15

¹H NMR of Conformationally Flexible Molecules: Variable-Temperature NMR

1.7K
The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
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Frost Circles for Different Conjugated Systems01:18

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The inscribed polygon method is consistent with Hückel’s 4n + 2 rule and helps to learn whether the given cyclic compound is aromatic or not. The compound is stable and aromatic if every bonding molecular orbital (MO) is completely filled with a pair of electrons. However, if the non-bonding or antibonding orbitals are filled with electrons, the compound is unstable and not aromatic. Consider the Frost circle diagrams for cycloalkenes containing 4 to 8 carbons.
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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

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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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Woodward–Hoffmann Selection Rules and Microscopic Reversibility01:34

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Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
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Fused Octapyrrolyl Cyclooctatetraene with Large NIR-II Faraday Rotation.

Daniel J Martinez1, Molly C Warndorf1, Avisek Dutta2,3

  • 1Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States.

Journal of the American Chemical Society
|September 17, 2025
PubMed
Summary
This summary is machine-generated.

Organic Faraday rotators offer advantages over inorganic materials. A novel fused octapyrrolyl cyclooctatetraene (FOPCOT) molecule achieves a record high Verdet constant for near-infrared magneto-optical applications.

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Area of Science:

  • Organic electronics
  • Magneto-optical materials

Background:

  • Organic Faraday rotators offer mechanical flexibility and ease of fabrication.
  • Current organic materials are not optimized for near-infrared (NIR) magneto-optical applications.

Purpose of the Study:

  • To synthesize and characterize a novel organic molecule for NIR magneto-optical applications.
  • To achieve a high Verdet constant in the NIR-II region using organic materials.

Main Methods:

  • A three-step, one-pot synthesis of fused octapyrrolyl cyclooctatetraene (FOPCOT).
  • In situ formation of a zirconacycle intermediate followed by copper-mediated transmetalation.
  • Oxidation of FOPCOT to FOPCOT•+ and FOPCOT2+ using AgPF6.
  • Magneto-optical characterization using magnetic circular dichroism.

Main Results:

  • A record high Verdet constant for a small molecule in the NIR-II region was achieved with FOPCOT2+.
  • FOPCOT2+ exhibited strong optical absorption at 1198 nm.
  • A maximum Verdet constant of -2.5 × 10^5 deg T^-1 m^-1 was recorded at 1224 nm.

Conclusions:

  • The synthesized FOPCOT molecule is a promising candidate for NIR magneto-optical applications.
  • The novel synthetic route provides an alternative for incorporating pyrrole into polycyclic aromatic hydrocarbons.
  • This work expands the potential of organic materials in advanced optical devices.