Fluorine-Enabled Organic Synthesis Techniques

Fluorine incorporation has emerged as a cornerstone of modern organic synthesis owing to the unique electronic and structural attributes conferred by the C–F bond. Its high electronegativity and bond strength impart metabolic stability, novel bioactivity and enhanced material properties across pharmaceuticals, agrochemicals and advanced polymers. Contemporary methods span electrophilic and nucleophilic fluorination, photoredox-mediated radical fluorinations, selective C–F bond activation and defluorinative coupling, as well as catalytic perfluoroalkylation strategies. Advances include transition-metal‐catalysed cross-couplings enabling aryl–CF₃ and CF₂R motif construction, superacid-mediated carbonylations at C–F centres, and organocatalytic protocols for enantioselective C–F bond formation. Synergies between computational design and high-throughput experimentation have accelerated the discovery of tailored fluorinating reagents and catalysts. These techniques collectively underpin the creation of functional molecules with precisely tuned lipophilicity, electronic character and three-dimensional shape, showcasing global significance for drug discovery, agrochemical innovation and next-generation materials.

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Fluorine-Enabled Organic Synthesis Techniques publication trend

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

Technical terms

Electrophilic fluorination: Introduction of F⁺ species into a substrate using reagents that deliver fluorine electrophilically.
Nucleophilic fluorination: Substitution reaction involving F⁻ donors to replace leaving groups with fluorine.
C–F bond activation: Cleavage or functionalisation of a carbon–fluorine bond under catalytic or superacidic conditions.
Superacid: Acidic medium stronger than 100 % H₂SO₄, used to promote challenging reactions such as C–F activation.
Diels–Alder reaction: [4+2] cycloaddition between a conjugated diene and a dienophile, forming cyclohexene frameworks.
Conjugate addition: Nucleophilic attack at the β-carbon of an α,β-unsaturated system, often followed by elimination.

References

1. An Easy Synthesis of Monofluorinated Derivatives of Pyrroles from β-Fluoro-β-Nitrostyrenes. Molecules (2021).
2. Carbonylation of Polyfluorinated 1-Arylalkan-1-ols and Diols in Superacids. Molecules (2022).
3. Diels–Alder reaction of β-fluoro-β-nitrostyrenes with cyclic dienes. Beilstein Journal of Organic Chemistry (2021).