Visible-Light-Induced Decarboxylative Cross-Coupling Reactions: Transition-Metal and Metal-Free Approaches

Area of Science:

• Coordination Chemistry
• Organic Synthesis
• Photocatalysis

Background:

• Photocatalysis offers a sustainable route for organic synthesis using visible light.
• Transition-metal complexes are vital for electron-transfer and energy-transfer (EnT) in photocatalysis.
• Decarboxylative cross-coupling reactions efficiently form C-C and C-heteroatom bonds using carboxylic acids.

Purpose of the Study:

• To review recent advances in visible-light-induced decarboxylative cross-coupling reactions.
• To examine these reactions from a coordination chemistry perspective.
• To highlight mechanistic pathways and catalyst design strategies.

Main Methods:

• Review of literature on visible-light photocatalysis and decarboxylative cross-coupling.
• Analysis of transition-metal complexes (Ru, Ir, Cu, Ni) as photocatalysts.
• Discussion of cooperative dual-catalytic, metallaphotoredox, and metal-free systems.

Main Results:

• Exploration of various photocatalyst classes and their roles in electron and energy transfer.
• Detailed examination of mechanistic pathways, including SET, LMCT, and EnT.
• Identification of key challenges and opportunities in catalyst development and reaction scalability.

Conclusions:

• Coordination chemistry is central to developing efficient and sustainable photocatalytic methods.
• Visible-light decarboxylative cross-coupling offers a versatile approach to bond formation.
• Future directions involve catalyst design, sustainability, and scalability for greener synthesis.