Synthesis 2023; 55(02): 193-231
DOI: 10.1055/a-1946-0512
review
Special Issue dedicated to Prof. Alain Krief

Emerging Activation Modes and Techniques in Visible-Light-Photocatalyzed Organic Synthesis

Dries De Vos
,
Karthik Gadde
,
This work was supported by the Universiteit Antwerpen (BOF), the Fonds Wetenschappelijk Onderzoek Vlaanderen (Fund for Scientific Research Flanders (FWO) (project G0F1420N and scholarship to D.D.V., 11G6621N). B.U.W.M. is a Collen-Francqui research professor of the Francqui foundation.


Dedicated to Professor Alain Krief on the occasion of his 80th birthday

Abstract

Visible light photocatalysis has evolved into a promising mild and sustainable strategy to access radicals. This field unlocks formerly challenging or even previously inaccessible organic transformations. In this review, an overview of some lesser-known modes of photochemical activation of organic molecules and several emerging techniques within the versatile field of visible light photocatalysis are discussed. These are illustrated by selected photocatalytic reactions, with particular attention given to the reaction mechanism.

1 Introduction

2 Advanced Photoactivation Modes

2.1 Photoinduced Hydrogen-Atom Transfer

2.2 Proton-Coupled Electron Transfer

2.3 Electron Donor-Acceptor Photoactivation of Organic Substrates

2.4 Excited-State Transition Metal Catalysis

3 Emerging Techniques

3.1 Dual Catalysis

3.2 Excited Radical Ion Photocatalysis

3.3 Upconversion Strategies and Other Two-Photon Mechanisms

3.4 Red and Near-Infrared Photocatalysis

4 Conclusions and Outlook



Publication History

Received: 16 July 2022

Accepted after revision: 16 September 2022

Accepted Manuscript online:
16 September 2022

Article published online:
29 November 2022

© 2022. Thieme. All rights reserved

Georg Thieme Verlag KG
Rüdigerstraße 14, 70469 Stuttgart, Germany