Pentafluorosulfanyl Compound Chemistry

The pentafluorosulfanyl (SF5) group has emerged as a privileged motif in modern synthetic chemistry, combining high electronegativity, pronounced steric demand and remarkable metabolic stability. These attributes render SF5 a “super-trifluoromethyl” substitute that modulates lipophilicity, electronic distribution and three-dimensionality of organic frameworks. Synthetic access to SF5-containing compounds has advanced through strategies such as direct halide exchange from SF5Cl or SF5Br precursors, activation of sulfur hexafluoride under photoredox or nucleophilic conditions, and radical additions to unsaturated substrates. More recent developments exploit transition-metal catalysis and strain-release functionalisation to install SF5 groups into complex scaffolds. Collectively, these methods have widened the palette of fluorinated building blocks available for applications in drug discovery, agrochemical development and materials science, while also offering routes to neutralise the potent greenhouse gas SF6. The interdisciplinary impact of SF5 chemistry spans the design of novel bioisosteres, the creation of fluorinated heterocycles and the assembly of supramolecular architectures, underscoring its global significance across chemical and environmental research.

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Pentafluorosulfanyl Compound Chemistry publication trend

The graph below shows the total number of articles in pentafluorosulfanyl compound chemistry across all publications each year (not limited to Nature Index journals).

Technical terms

Pentafluorosulfanyl (SF5): A substituent featuring a central sulfur atom bonded to five fluorine atoms, notable for high electronegativity, steric bulk and metabolic stability.

Bioisostere: A functional group replacement designed to mimic the physicochemical properties of another group, often employed in drug design to improve potency, selectivity or pharmacokinetics.

Csp–Csp3 coupling: A carbon–carbon bond-forming reaction between an sp-hybridised carbon (alkyne) and an sp3-hybridised carbon, typically mediated by transition-metal catalysis.

Hydroelementation: A reaction that adds a hydrogen and another element (such as oxygen, nitrogen or sulphur) across a multiple bond, enabling formation of functionalised alkenes.

References

1. Activation and Catalytic Degradation of SF6 and PhSF5 at a Bismuth Center. Journal of the American Chemical Society (2024).
2. Expanding the Frontier of Linear Drug Design: Cu‐Catalyzed Csp–Csp3‐Coupling of Electron‐Deficient SF4‐Alkynes with Alkyl Iodides. Advanced Science (2023).
3. Discovery of practical production processes for arylsulfur pentafluorides and their higher homologues, bis- and tris(sulfur pentafluorides): Beginning of a new era of “super-trifluoromethyl” arene chemistry and its industry. Beilstein Journal of Organic Chemistry (2012).
4. Strain‐Release Pentafluorosulfanylation and Tetrafluoro(aryl)sulfanylation of [1.1.1]Propellane: Reactivity and Structural Insight**. Angewandte Chemie International Edition (2022).
5. Photoredox Catalytic Pentafluorosulfanylative Domino Cyclization of α‐Substituted Alkenes to Oxaheterocycles by Using SF6. Chemistry - A European Journal (2021).
6. Amine–borane complex-initiated SF5Cl radical addition on alkenes and alkynes. Beilstein Journal of Organic Chemistry (2020).
7. Regio‐ and Stereoselective Hydroelementation of SF5‐Alkynes and Further Functionalizations.. Angewandte Chemie International Edition (2023).
8. Synthesis of SF5-containing benzisoxazoles, quinolines, and quinazolines by the Davis reaction of nitro-(pentafluorosulfanyl)benzenes. Beilstein Journal of Organic Chemistry (2013).
9. Non‐Coordinated Phenolate Anions and Their Application in SF6 Activation. Chemistry - A European Journal (2020).