Aromatic ring-opening metathesis

Valeriia Hutskalova and Christof Sparr ()
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Valeriia Hutskalova: University of Basel
Christof Sparr: University of Basel

Nature, 2025, vol. 638, issue 8051, 697-703

Abstract: Abstract Aromatic compounds are used across chemistry and materials science as a result of their stability, characteristic interactions, defined molecular shape and the numerous approaches for their synthesis by a diversity of cyclization reactions1. By contrast, the cleavage of inert aromatic carbon–carbon bonds remained largely unfeasible owing to the unfavourable energetics of disrupting aromaticity on ring opening. For non-aromatic structures, alkene metathesis catalysed by transition-metal alkylidenes is established as one of the most versatile carbon–carbon bond-forming and -breaking reactions2,3. However, despite remarkable advancements, strategies to open aromatic compounds by metathesis remain elusive4. Here we report aromatic ring-opening metathesis (ArROM) for the cleavage of aromatic rings, including tetraphene, naphthalene, indole, benzofuran and phenanthrenes, by using Schrock–Hoveyda molybdenum catalysts. The reactions for each ring system proceed through unique alkylidene intermediates. We further show the possibility for stereoselective ArROM with exquisite catalyst control over the configuration of atropisomers. ArROM is, therefore, a viable and efficient approach to catalytically transform and interconvert various aromatics without the requirement for any reagents or photoexcitation.

Date: 2025
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DOI: 10.1038/s41586-024-08472-z

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