Strain-release Pentafluorosulfanylation and Tetrafluoro(aryl)sulfanylation of [1.1.1]Propellane: Reactivity and Structural Insight

11 August 2022, Version 1
This content is a preprint and has not undergone peer review at the time of posting.


We leveraged the recent increase in synthetic accessibility of SF5Cl and Ar-SF4Cl compounds to combine chemistry of the SF5 and SF4Ar groups with strain-release functionalization. By effectively adding SF5 and SF4Ar radicals across [1.1.1]propellane, we accessed structurally unique bicyclopentanes, bearing two distinct elements of bioisosterism. Upon evaluating these “hybrid isostere” motifs in the solid state, we measured exceptionally short transannular distances; in one case, the distance rivals the shortest nonbonding C···C contact reported to date. This prompted SC-XRD and DFT analyses that support the notion that a donor-acceptor interaction involving the “wing” C–C bonds is playing an important role in stabilization. Thus, these heretofore unknown structures expand the palette for highly coveted three-dimensional fluorinated building blocks and provide insight to a more general effect observed in bicyclopentanes.


Main Group Chemistry
Strained Molecules
X-ray Crystallography
Fluorine Chemistry


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