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In 2015, chemists synthesized all-cis hexafluorocyclohexane, a six-carbon ring with all six carbon–fluorine bonds pointing to the same face. The molecule keeps a chair shape despite closely spaced fluorine atoms; its reported structure and large dipole make it an unusual example of facial polarity in a small organic molecule. The authors proposed that repulsive tension helps stabilize the chair, but that is an interpretation of the geometry, not a directly measured force.
What “all-cis” means in this molecule
Hexafluorocyclohexane has one fluorine attached to each carbon in a cyclohexane ring. “All-cis” means the six C–F bonds are oriented toward the same side of the ring. That arrangement gives the molecule a strongly differentiated fluorinated face and opposite face; it does not mean the ring is flat.
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Instead, the molecule adopts the familiar chair conformation of cyclohexane. In the reported structure, three fluorines occupy axial positions and align on one face, while the other three occupy equatorial positions. This combination of a chair-shaped ring and a single fluorinated face is central to the molecule’s unusual geometry.
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What the measurements show
Keddie and coauthors reported a molecular dipole of 6.2 D, unusually large for an aliphatic compound. The value is consistent with the molecule’s asymmetric distribution of fluorine atoms across the ring, which gives it a polarized, face-to-face character.
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X-ray analysis found close intramolecular fluorine separations: approximately 2.77 Å between axial fluorines and approximately 2.73 Å between neighboring axial and equatorial fluorines. The authors suggested that the geometry reflects repulsive tension that helps stabilize the observed chair conformation. The distances are structural measurements; “tension” is the authors’ interpretation, not a separately measured force.
The researchers also reported that the molecules’ orientation in the solid-state crystal packing was consistent with electrostatic ordering. This describes the observed packing in the crystal, not a demonstrated function in a device or material.
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How chemists made the ring
The synthesis began with myo-inositol, a six-carbon starting material. Researchers converted it into a cyclohexane precursor bearing oxygen substituents on one face, then replaced those substituents through sequential deoxyfluorination. Each substitution inverted the configuration at its carbon, producing the all-cis fluorinated target.
The paper describes a 12-step protocol. Chemistry World’s contemporaneous 2015 report gives an approximate overall yield of 10%; that figure is from the secondary report and should not be mistaken for a yield independently established here from the paper’s experimental data.
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What the result does—and does not—establish
The work established that chemists could prepare this highly fluorinated stereoisomer and characterize its dipole, chair conformation and close F···F contacts. The synthesis and structure were reported by Neil S. Keddie, Alexandra M. Z. Slawin, Tomas Lebl, Douglas Philp and David O’Hagan in Nature Chemistry, volume 7, pages 483–488. The article appeared online on 13 April 2015 and in the June 2015 issue.
The authors pointed to derivatives as possible motifs for functional molecules or supramolecular chemistry. Those possibilities are prospective: the cited sources do not establish a validated application, industrial adoption or consumer product based on the compound. The molecule is best understood as a synthetic chemistry achievement and a platform of potential interest for future molecular design.
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Sources
- Keddie et al., “All-cis-1,2,3,4,5,6-hexafluorocyclohexane,” Nature Chemistry (2015)
- University of St Andrews institutional repository record and manuscript
- PubMed bibliographic record and abstract
- Chemistry World’s contemporaneous 2015 report
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