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Related Concept Videos

Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

1.8K
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
1.8K
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

3.2K
Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
3.2K
Dehydration of Aldols to Enones: Acid-Catalyzed Aldol Condensation00:43

Dehydration of Aldols to Enones: Acid-Catalyzed Aldol Condensation

2.1K
As shown in Figure 1, under acidic conditions, the β-hydroxy ketone undergoes dehydration via an E1 elimination reaction to form an enone.
2.1K
Dehydration of Aldols to Enals: Base-Catalyzed Aldol Condensation01:14

Dehydration of Aldols to Enals: Base-Catalyzed Aldol Condensation

5.2K
This lesson delves into the aldol condensation catalyzed by bases, where aldols undergo dehydration to enals. As shown in Figure 1, the β-hydroxy aldehyde formed in a base-catalyzed aldol addition reaction dehydrates on heating to yield an unsaturated carbonyl product, which is commonly referred to as an enal.
5.2K
The Photochemical Reaction Center01:29

The Photochemical Reaction Center

4.0K
Reaction centers are pigment-protein complexes that initiate energy conversion from photons to chemical entities. Therefore, photochemical reaction center is a more appropriate term that describes these complexes. The Nobel laureates Robert Emerson and William Arnold provided the first experimental evidence of photochemical reaction centers by demonstrating the participation of nearly 2,500 chlorophyll molecules for the release of just one molecule of oxygen. Despite thousands of photosynthetic...
4.0K
Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

2.3K
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.
2.3K

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Related Experiment Video

Updated: May 17, 2025

Light-driven Enzymatic Decarboxylation
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Light-driven Enzymatic Decarboxylation

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Photoinduced Ene-Reductase Catalysis via Electron Donor-Acceptor Complexes.

Jian Xu1, Shuang Liu1, Runmiao Yang1

  • 1Key Laboratory of Bioorganic Synthesis of Zhejiang Department Province, College of Biotechnology and Bioengineering, Zhejiang University of Technology, Hangzhou, 310014, P. R. China.

Chembiochem : a European Journal of Chemical Biology
|May 15, 2025
PubMed
Summary
This summary is machine-generated.

Flavin-dependent ene-reductases (EREDs) catalyze reductions. Light activation enhances their potential, enabling efficient biocatalysis and expanding applications in organic synthesis.

Keywords:
electron donor–acceptor complexesphotoenzyme catalysisradicals

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Area of Science:

  • Biocatalysis
  • Enzymology
  • Photochemistry

Background:

  • Flavin-dependent ene-reductases (EREDs) are versatile biocatalysts for asymmetric reductions.
  • Traditional ERED catalysis can be limited by substrate scope and reaction conditions.

Purpose of the Study:

  • To review recent advances in light-induced electron transfer-mediated reductions using EREDs.
  • To explore the mechanistic basis of photoactivation in EREDs and their applications.

Main Methods:

  • Focus on electron donor-acceptor (EDA) complexes and photoexcitation of flavin cofactors.
  • Mechanistic analysis of light-altered redox properties of EREDs.
  • Review of applications in organic synthesis.

Main Results:

  • Photoexcitation significantly enhances the reduction potential of the flavin cofactor.
  • Light activation leads to more efficient biocatalysis by EREDs.
  • Broadened application scope of photoexcited EREDs in organic synthesis.

Conclusions:

  • Light-driven ERED catalysis offers a powerful tool for organic synthesis.
  • Understanding photoactivation mechanisms is key to optimizing these systems.
  • Future directions involve developing novel, light-controlled enzymatic systems with improved performance.