Synthesis 2022; 54(21): 4629-4645
DOI: 10.1055/a-1898-1816
review

Light-Driven Palladium-Radical Hybrid Species: Mechanistic Aspects and Recent Examples

Guilherme A. M. Jardim
,
Juliana A. Dantas
,
Amanda A. Barboza
,
Márcio W. Paixão
,
We gratefully acknowledge the financial support in the form of funding and fellowships provided by the Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) (2020/10246-0, 2020/01255-6 and 2021/06099-5), the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) (Finance Code 001), the Programa Nacional de Pós Doutorado/Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (PNPD/CAPES) and the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) (405052/2021-9).


Abstract

Visible-light-induced palladium-mediated reactions have become a novel and promising field in organic synthesis. This photocatalytic arsenal presents complementary features towards traditional Pd chemistry, allowing the achievement of new and unique reactivities by the generation of versatile Pd-radical hybrid species. These putative intermediates can be produced by direct excitation of Pd complexes, together with organic radical precursors. This review aims at describing recent advances regarding the combination of Pd-based photocatalytic manifolds and radical generation in the functionalization of important motifs in synthetic chemistry, encompassing detailed mechanistic descriptions and relevant examples.

1 Introduction

2 Homolytic Cleavage of C–X Bonds

3 Cyclizations, Desaturations and Atom Transfer Reactions

4 Homolytic Cleavage of N–O Bonds

5 Generation through Diazo Compounds

6 Generation of Acyl Radicals

7 Generation of Ketyl Radicals

8 Conclusions



Publication History

Received: 10 June 2022

Accepted after revision: 12 July 2022

Accepted Manuscript online:
12 July 2022

Article published online:
22 August 2022

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