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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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Catalysis02:50

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The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
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Electrochemistry is the branch of chemistry that studies the relationship between electrical quantities and chemical reactions, particularly oxidation and reduction. Oxidation is the loss of electrons from a substance, whereas reduction refers to the gain of electrons. A substance with a strong electron affinity is called an oxidizing agent (oxidant), and a reducing agent (reductant) is a species that donates electrons. Oxidation and reduction processes are pivotal to electrochemical reactions,...
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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.
Selection Rules: Photochemical Activation
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Thermal Electrocyclic Reactions: Stereochemistry01:17

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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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For many years, scientists thought that enzyme-substrate binding took place in a simple "lock-and-key" fashion. This model stated that the enzyme and substrate fit together perfectly in one instantaneous step. However, current research supports a more refined view scientists call induced fit. The induced-fit model expands upon the lock-and-key model by describing a more dynamic interaction between enzyme and substrate. As the enzyme and substrate come together, their interaction causes...
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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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Perovskites in catalysis and electrocatalysis.

Jonathan Hwang1, Reshma R Rao2, Livia Giordano2,3

  • 1Department of Materials Science and Engineering, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USA.

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Perovskite oxides are versatile earth-abundant catalysts for critical chemical and electrochemical reactions. This review details their design and application in energy and environmental technologies.

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Area of Science:

  • Materials Science
  • Catalysis
  • Electrochemistry

Background:

  • Heterogeneous catalysts are crucial for energy storage, emissions control, and synthesis.
  • Developing active, stable, and earth-abundant catalysts is a key industrial and technological challenge.

Purpose of the Study:

  • To review perovskite oxides as a promising class of heterogeneous catalysts.
  • To provide a framework for rationalizing activity trends and guiding catalyst design.
  • To explore the role of electronic structure in perovskite electrocatalysis.

Main Methods:

  • Review of existing literature on perovskite oxide catalysts.
  • Analysis of structure-property relationships in perovskite materials.
  • Examination of electronic structure principles for catalyst design.

Main Results:

  • Perovskite oxides show potential for diverse (electro)chemical conversions (carbon, nitrogen, oxygen chemistries).
  • A framework exists for predicting and optimizing perovskite catalyst performance.
  • Understanding electronic structure offers fundamental insights into oxygen electrocatalysis.

Conclusions:

  • Perovskite oxides offer a tunable platform for next-generation catalysts.
  • Rational design based on electronic structure is key to advancing catalytic applications.
  • Future opportunities lie in expanding compositional and reaction scope through experimental and computational efforts.