Metal-Mediated Hydrodehalogenation Reactions in Organic Synthesis

Hydrodehalogenation, the selective replacement of carbon–halogen bonds with hydrogen, stands as a cornerstone transformation in modern organic synthesis. Transition-metal catalysts such as palladium, nickel, molybdenum and indium complexes have been developed to activate aryl and alkyl halides under mild conditions, offering high selectivity and functional-group tolerance. Mechanistically, these processes may proceed via oxidative addition and reductive elimination cycles, hydride-transfer pathways or radical-chain sequences, depending on the metal centre, ligand environment and hydrogen source. Recent efforts have focused on ligand design to tune electronic and steric properties, the use of non-traditional hydrogen donors and the development of heterogeneous or immobilised catalysts for enhanced recyclability. Advances in electrochemical and photochemical strategies have further broadened substrate scope and improved sustainability by minimising external reductants. Collectively, these developments underscore the global significance of metal-mediated hydrodehalogenation for fine-chemical manufacture, pharmaceutical synthesis and environmental remediation, linking fundamental organometallic chemistry to real-world applications.

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Metal-Mediated Hydrodehalogenation Reactions in Organic Synthesis publication trend

The graph below shows the total number of articles in metal-mediated hydrodehalogenation reactions in organic synthesis across all publications each year (not limited to Nature Index journals).

Technical terms

Hydrodehalogenation: the removal of a halogen atom from an organic substrate by addition of hydrogen.

Transition-metal catalyst: a metal complex that facilitates bond activation and transformation without being consumed.

Hydride transfer: the movement of a hydrogen anion (H−) from one species to another in reduction processes.

Radical chain process: a reaction sequence involving radical initiation, propagation and termination steps.

Paddlewheel complex: a dinuclear metal assembly bridged by ligands that enables multi-electron redox reactivity.

References

1. Mixed-ligand complexes of paddlewheel dinuclear molybdenum as hydrodehalogenation catalysts for polyhaloalkanes. Chemical Science (2015).
2. Efficient Indium-Mediated Dehalogenation of Aromatics in Ionic Liquid Media. Molecules (2012).
3. An efficient debromination technique using PMHS with a number of ligands containing different functional groups.. Arkivoc (2021).