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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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The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
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Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
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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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Photochemical Electrocyclic Reactions: Stereochemistry01:26

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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
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Aromatic Hydrocarbon Anions: Structural Overview01:18

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Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
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Pericyclic reactions are organic reactions that occur via a concerted mechanism without generating any intermediates. The reactions proceed through the movement of electrons in a closed loop to form a cyclic transition state, where rearrangement of the σ and π bonds yields specific products.
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Exploring Closed-Shell Cationic Phenalenyl: From Catalysis to Spin Electronics.

Arup Mukherjee1, Samaresh Chandra Sau2, Swadhin K Mandal2

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

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|July 1, 2017
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Summary
This summary is machine-generated.

Researchers explored the closed-shell cationic state of phenalenyl (PLY) molecules, overcoming the instability of radical forms. This approach enables new applications in catalysis and spin electronics by utilizing the empty nonbonding molecular orbital (NBMO) for electron capture.

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Area of Science:

  • Organic Chemistry
  • Materials Science
  • Physical Chemistry

Background:

  • Phenalenyl (PLY) chemistry traditionally focused on its unstable open-shell radical state.
  • The closed-shell cationic state of PLY, utilizing its nonbonding molecular orbital (NBMO), has been largely unexplored.
  • Recent advancements highlight the potential of PLY-based materials in diverse applications.

Purpose of the Study:

  • To investigate the utility of the closed-shell cationic state of phenalenyl (PLY) molecules.
  • To demonstrate novel applications of PLY in catalysis and spin electronics.
  • To leverage the electron-accepting properties of the PLY NBMO for material design.

Main Methods:

  • Synthesizing and characterizing PLY-based molecules in their closed-shell cationic state.
  • Developing homogeneous catalysts, including electrocatalysts and organocatalysts, utilizing the PLY moiety.
  • Designing spin-electronic devices, such as spin-memory devices, based on PLY structures.

Main Results:

  • Demonstrated successful application of closed-shell PLY in various homogeneous catalysis, including H2O2 fuel cells, hydroamination, polymerization, and C-H functionalization.
  • Developed a PLY-based spin-memory device exhibiting spin-filtration properties.
  • Showcased the stability and versatility of the closed-shell cationic PLY state for advanced material development.

Conclusions:

  • The closed-shell cationic state of PLY offers a stable and versatile platform for developing advanced materials.
  • This approach overcomes the limitations of unstable PLY radicals, enabling new applications in catalysis and spin electronics.
  • The exploration of the PLY NBMO's electron-capturing capability opens new avenues in organometallic chemistry, organic chemistry, and device physics.