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Adolf von Baeyer attempted to explain the instabilities of small and large cycloalkane rings using the concept of angle strain — the strain caused by the deviation of bond angles from the ideal 109.5° tetrahedral value for sp3  hybridized carbons. However, while cyclopropane and cyclobutane are strained, as expected from their highly compressed bond angles, cyclopentane is more strained than predicted, and cyclohexane is virtually strain-free. Hence, Baeyer’s theory that...
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Solution-phase stabilization of a cyclocarbon by catenane formation.

Yueze Gao1, Prakhar Gupta1, Igor Rončević2

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Researchers synthesized a stable cyclo[48]carbon catenane, a ring of 48 carbon atoms, enabling room-temperature study. This breakthrough overcomes the high reactivity typically limiting cyclo[N]carbon research.

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Area of Science:

  • Organic Chemistry
  • Materials Science

Background:

  • Cyclo[N]carbons are molecular rings of N carbon atoms.
  • Previously, these compounds were limited to gas-phase or cryogenic studies due to high reactivity.
  • Ambient laboratory study of cyclo[N]carbons was considered unfeasible.

Purpose of the Study:

  • To synthesize and characterize a cyclo[48]carbon molecule stable under ambient conditions.
  • To overcome the inherent reactivity limitations of cyclo[N]carbons.
  • To explore the potential for studying these unique carbon structures in solution.

Main Methods:

  • Synthesis of a cyclo[48]carbon [4]catenane, where the C48 ring is protected by three interlocked macrocycles.
  • Spectroscopic characterization in solution at room temperature.
  • Analysis using mass spectrometry, 13C nuclear magnetic resonance (NMR), and Raman spectroscopy.

Main Results:

  • Successful synthesis of a cyclo[48]carbon [4]catenane.
  • Demonstrated stability of the cyclo[48]carbon catenane in solution at room temperature.
  • Spectroscopic data (mass, 13C NMR, Raman) confirmed the structure and properties of the C48 ring, showing a single 13C NMR resonance at 72.9 ppm and a Raman peak at 1890 cm-1.

Conclusions:

  • The development of a protected cyclo[48]carbon catenane enables its study under ambient laboratory conditions.
  • This work significantly expands the accessibility and research potential of cyclo[N]carbon molecules.
  • The findings suggest that macrocyclic protection strategies can stabilize highly reactive carbon allotropes.