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Photochemical Electrocyclic Reactions: Stereochemistry

Photochemical Electrocyclic Reactions: Stereochemistry

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

Cycloaddition Reactions: MO Requirements for Photochemical Activation

Cycloaddition Reactions: MO Requirements for Photochemical Activation

Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.

Sharpless Epoxidation

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The conversion of allylic alcohols into epoxides using the chiral catalyst was discovered by K. Barry Sharpless and is known as Sharpless epoxidation. The use of a chiral catalyst enables the formation of one enantiomer of the product in excess. This chiral catalyst is mainly a chiral complex of titanium tetraisopropoxide and tartrate ester (specific stereoisomer). The stereoisomer used in the chiral catalyst dictates the formation of the enantiomer of the product. In other words, the use of...

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Updated: Aug 5, 2025

Light-driven Enzymatic Decarboxylation

Light-driven Enzymatic Decarboxylation

Published on: May 22, 2016

Visible-Light-Mediated Photocatalytic Deracemization.

Jiahao Wang¹, Xinxin Lv¹, Zhiyong Jiang^1,2

¹Pingyuan Laboratory NMPA Key Laboratory for Research and Evaluation of Innovative Drug Henan Key Laboratory of Organic Functional Molecules and Drug Innovation School of Chemistry and Chemical Engineering, Henan Normal University Xinxiang, Henan, 453007, P. R. China.

Chemistry (Weinheim an Der Bergstrasse, Germany)

|March 27, 2023

Summary

This summary is machine-generated.

Visible-light photocatalysis enables efficient deracemization, converting racemic mixtures into single enantiomers with 100% atom economy. This review summarizes recent advances in this powerful green chemistry approach.

Keywords:

deracemization energy transfer photocatalysis radical single electron transfer

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Area of Science:

Organic Chemistry
Green Chemistry
Photocatalysis

Background:

Asymmetric catalysis is vital for synthesizing enantiomerically pure compounds.
High atom economy is essential for practical and sustainable chemical synthesis.
Deracemization offers 100% atom efficiency by converting racemic mixtures to single enantiomers.

Purpose of the Study:

To review recent advancements in visible-light photocatalysis for deracemization.
To discuss the mechanisms of energy and single-electron transfer in photocatalytic deracemization.
To highlight the advantages of photocatalysis in overcoming kinetic and thermodynamic challenges.

Main Methods:

Systematic summary and discussion of published research on photocatalytic deracemization.
Organization of examples based on photocatalytic mechanisms (energy transfer, single-electron transfer).

Main Results:

Visible-light photocatalysis is a powerful platform for achieving efficient deracemization.
Photocatalysis effectively addresses kinetic and thermodynamic limitations in deracemization reactions.
This approach avoids stoichiometric reagents, enhancing sustainability.

Conclusions:

Visible-light-driven photocatalysis represents a significant breakthrough in deracemization.
The methodology offers a sustainable and atom-economical route to enantiopure compounds.
Further exploration of energy and single-electron transfer mechanisms will drive future innovation.