Catalytic Strategies in Diene Hydrovinylation Reactions

Diene hydrovinylation, the addition of ethylene across a conjugated diene framework to yield 1,4-dienes, has emerged as a cornerstone transformation for the efficient construction of complex hydrocarbon scaffolds. Central to this field is the design of transition-metal catalysts that orchestrate a sequence of ligand-assisted coordination, oxidative cyclisation and migratory insertion steps to form metallacyclic intermediates, followed by reductive elimination to release the hydrovinylated product. Fine-tuning of the metal centre, ligand architecture and ancillary additives enables precise control over regioselectivity (linear versus branched addition), stereoselectivity (E/Z alkene geometry) and enantioselectivity. Recent advances exploit earth-abundant metals—such as iron and cobalt—bearing pincer or diimine ligands, as well as classical noble-metal systems based on ruthenium, palladium and nickel. Developments in chiral ligand scaffolds have delivered enantiomerically enriched dienes suitable for downstream asymmetric synthesis. Beyond mechanistic innovation, these strategies address sustainability by using simple feedstocks and minimising by-products. Applications range from the synthesis of fine chemicals and fragrance ingredients to monomers for specialty polymers, underscoring the global relevance of highly selective hydrovinylation processes.

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Catalytic Strategies in Diene Hydrovinylation Reactions publication trend

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Technical terms

Metallacycle: A cyclic intermediate in which a metal centre is bound to two or more atoms of an organic substrate, facilitating bond formation.

Oxidative cyclisation: A step in which a π-bonded substrate undergoes simultaneous coordination and bond formation at a metal centre, raising its oxidation state.

Migratory insertion: The intramolecular shift of a ligand (e.g. an alkene or hydride) into a coordinated unsaturated fragment, forming a new carbon–carbon bond.

Reductive elimination: The process by which two ligands on a metal centre couple and dissociate as a neutral product, reducing the metal’s oxidation state.

Regioselectivity: The preference for bond formation at one position over other possible sites on a substrate.

Enantioselectivity: The preferential formation of one enantiomer over its mirror image in a chiral reaction.

References

1. C S‑Symmetric Pyridine(diimine) Iron Methyl Complexes for Catalytic [2+2] Cycloaddition and Hydrovinylation: Metallacycle Geometry Determines Selectivity. JACS Au (2023).
2. Cobalt-catalysed asymmetric hydrovinylation of 1,3-dienes. Chemical Science (2015).