Fluorinated Olefin Synthesis Techniques

Fluorinated olefins, characterised by one or more fluorine atoms on a carbon–carbon double bond, are prized motifs in pharmaceuticals, agrochemicals and advanced materials owing to fluorine’s unique electronic and steric effects. The synthesis of these motifs hinges on overcoming the inherent strength and inertness of C–F bonds while achieving precise control over regiochemistry and stereochemistry. Contemporary strategies encompass transition-metal-catalysed C–F bond activation, cross-coupling of pre-fluorinated building blocks, metal-free hydrodefluorination and radical-mediated defluorinative couplings under photochemical conditions. Advances in reagent design, mechanistic understanding and computational modelling have driven step-economical routes with broad functional-group tolerance. These innovations facilitate late-stage fluorination, diversify olefin architectures and open new avenues for bioisostere incorporation and functional material development.

Research from Nature Portfolio

Foundational work has demonstrated rhodium(III)-catalysed tandem C–H/C–F activation, converting gem-difluoroalkenes and (hetero)arenes into arylated monofluoroalkenes under oxidant-free, mild conditions, thus establishing a blueprint for selective C–F bond cleavage and forging C(sp2)–C(sp2) linkages. Building on metal-free catalysis, a diazaphospholene system enables chemoselective hydrodefluorination of trifluoromethylalkenes to afford mono- and gem-difluoroalkenes in near-quantitative yields by simple stoichiometric control. More recently, nickel-catalysed cross-coupling of 2,2-difluorovinyl benzoates with arylboronic acids or organozinc reagents has emerged as a modular platform for synthesising gem-difluoroenol ethers and gem-difluoroalkenes with high regioselectivity, excellent functional-group tolerance and amenability to late-stage functionalisation.

Fluorinated Olefin Synthesis Techniques publication trend

The graph below shows the total number of articles in fluorinated olefin synthesis techniques across all publications each year (not limited to Nature Index journals).

Technical terms

Fluorinated olefin: Alkene bearing one or more fluorine substituents affecting reactivity and properties.

Monofluoroalkene: Olefin with a single fluorine atom replacing a hydrogen on the double bond.

gem-Difluoroalkene: Olefin in which two fluorine atoms are attached to the same alkene carbon.

C–F bond activation: Process of cleaving or functionalising a carbon–fluorine bond through catalytic or radical pathways.

Hydrodefluorination: Reaction in which a fluorine atom is removed and replaced by hydrogen.

Electron donor–acceptor complex: Non-covalent assembly that facilitates photoinduced single-electron transfer.

References

1. Rhodium-catalysed C(sp2)–C(sp2) bond formation via C–H/C–F activation. Nature Communications (2015).
2. Chemoselective catalytic hydrodefluorination of trifluoromethylalkenes towards mono-/gem-di-fluoroalkenes under metal-free conditions. Nature Communications (2021).
3. 2,2-difluorovinyl benzoates for diverse synthesis of gem-difluoroenol ethers by Ni-catalyzed cross-coupling reactions. Nature Communications (2021).
4. Silver-Catalyzed (Z)‑β-Fluoro-vinyl Iodonium Salts from Alkynes: Efficient and Selective Syntheses of Z‑Monofluoroalkenes. Journal of the American Chemical Society (2024).
5. Photoinduced Triphenylphosphine and Iodide Salt Promoted Reductive Decarboxylative Coupling. Advanced Science (2024).
6. Au(I) Catalyzed HF Transfer: Tandem Alkyne Hydrofluorination and Perfluoroarene Functionalization. ACS Catalysis (2022).