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Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

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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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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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Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

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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.
Selection Rules: Thermal Activation
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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Redox Equilibria: Overview01:23

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A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
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The light reactions of photosynthesis assume a linear flow of electrons from water to NADP+. During this process, light energy drives the splitting of water molecules to produce oxygen. However, oxidation of water molecules is a thermodynamically unfavorable reaction and requires a strong oxidizing agent. This is accomplished by the first product of light reactions: oxidized P680 (or P680+), the most powerful oxidizing agent known in biology. The oxidized P680 that acquires an electron from the...
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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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Functionalized Terthiophene as an Ambipolar Redox System: Structure, Spectroscopy, and Switchable Proton-Coupled

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Area of Science:

  • Organic electrochemistry
  • Energy science
  • Synthetic chemistry

Background:

  • Ambipolar organic redox systems enable reversible electron transfer but are underexplored in proton-coupled electron transfer (PCET).
  • Controlling hydrogen atom transfer with redox stimuli offers "switchable" reactivity potential.

Purpose of the Study:

  • To synthesize and characterize an ambipolar functionalized terthiophene (TTH) for switchable PCET reactions.
  • To investigate the electronic and structural factors enabling ambipolarity and PCET in the TTH system.

Main Methods:

  • Electrochemical synthesis and characterization of functionalized TTH.
  • Spectroscopic and computational studies to elucidate electronic structure.
  • Investigation of PCET reactions with model compounds (1,4-dihydroquinone and 2,3-dimethylanthraquinone).

Main Results:

  • Successfully synthesized and characterized an ambipolar TTH with methyl thioether and phosphine oxide groups.
  • Demonstrated reversible oxidation and reduction, stabilizing both cationic and anionic radicals.
  • Showcased switchable PCET reactivity, acting as both a hydrogen atom acceptor and donor.
  • Identified a 30 kcal/mol bond weakening as key to the switchable PCET mechanism.

Conclusions:

  • The functionalized TTH exhibits robust ambipolar redox behavior.
  • This ambipolarity enables controlled, switchable PCET reactions.
  • Provides a foundation for designing organic redox systems with tunable hydrogen atom transfer properties for diverse applications.