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[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement01:21

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The Cope rearrangement is classified as a [3,3] sigmatropic shift in 1,5-dienes, leading to a more stable, isomeric 1,5-diene. The reaction involves a concerted movement of six electrons, four from two π bonds and two from a σ bond, via an energetically favorable chair-like transition state.
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This lesson discusses the stability of substituted cyclohexanes with a focus on energies of various conformers and the effect of 1,3-diaxial interactions.
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For example, in...
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Selection Rules: Thermal Activation
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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Engineering solid-state morphologies in carbazole-ethynylene macrocycles.

Aaron D Finke1, Dustin E Gross, Amy Han

  • 1Department of Chemistry, University of Illinois at Urbana-Champaign, 61801, United States.

Journal of the American Chemical Society
|July 22, 2011
PubMed
Summary
This summary is machine-generated.

The length of n-alkyl side chains significantly impacts crystal packing in macrocycles. Longer chains can lead to novel intercalation motifs and solvent channels, influencing structural stability.

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Area of Science:

  • Supramolecular Chemistry
  • Crystallography
  • Materials Science

Background:

  • Shape-persistent macrocycles are crucial in supramolecular chemistry.
  • Controlling solid-state packing is key for material properties.
  • The influence of side-chain length on macrocycle assembly is not fully understood.

Purpose of the Study:

  • To systematically investigate how n-alkyl side-chain length affects crystal packing in carbazole-ethynylene macrocycles.
  • To elucidate the relationship between side-chain length and intermolecular interactions in the solid state.
  • To characterize novel packing motifs induced by specific alkyl chain lengths.

Main Methods:

  • Single-crystal X-ray diffraction analysis.
  • Systematic variation of n-alkyl side-chain lengths (up to C11).
  • Powder X-ray diffraction (PXRD) for bulk material analysis.
  • Solvent-bathing experiments to study guest exchange and structural response.

Main Results:

  • Crystal packing is highly sensitive to n-alkyl side-chain length.
  • Face-on aromatic π interactions dominate for shorter chains (up to C9).
  • A novel intercalation packing motif emerges with C10 and C11 chains, forming solvent channels.
  • C10 macrocycles exhibit solvent-molecule exchange and adaptive alkyl chain disorder while maintaining crystallinity.
  • PXRD data suggest longer alkyl chains can mimic π-stacking distances.

Conclusions:

  • N-alkyl side-chain length is a critical determinant of crystal packing in these macrocycles.
  • Longer alkyl chains can direct unique solid-state architectures, including solvent-filled channels.
  • The observed adaptive behavior in C10 macrocycles highlights dynamic structural responses to guest environments.
  • Careful consideration of alkyl-macrocycle interactions is necessary when interpreting solid-state structural data.