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Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

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Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
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Criteria for Aromaticity and the Hückel 4n + 2 Rule01:20

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Like benzene, cyclobutadiene and cyclooctatetraene are cyclic compounds with alternate single and double bonds. However, their chemical behavior differs from benzene, as they are unstable and not aromatic. So, what are the structural characteristics of unsaturated compounds categorized as aromatic?  
For the first time, Eric Hückel, a German chemical physicist, derived a set of structural features for a compound to be classified as aromatic. This is now known as...
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Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

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Neutral hydrocarbons like cyclopentadiene with an odd number of carbon atoms and one intervening CH2 group in the ring are not aromatic. Cyclopentadiene with 4 π electrons does not satisfy the 4n + 2 π electron rule. Additionally, the intervening CH2 group is sp3 hybridized and lacks a vacant p orbital, thereby interrupting the overlap of p orbitals in a continuous manner and preventing the delocalization of π electrons throughout the ring.
Due to the absence of continuous...
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Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry01:29

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Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.
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Naming Amides
The IUPAC and common names of amides are derived from the parent carboxylic acid, by replacing the suffix “oic acid” and “ic acid,” respectively, with “amide.” In the following example, the IUPAC name ethanamide is derived from ethanoic acid, and the common name, acetamide, is obtained from acetic acid.
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The Diels–Alder reaction is one of the robust methods for synthesizing unsaturated six-membered rings. The reaction involves a concerted cyclic movement of six π electrons: four π electrons from the diene and two π electrons from the dienophile.
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Tethered Helical Ladder-Type Aromatic Lactams.

Huidong Xie1,2, Zuo Xiao1,2, Yixiao Song1,2

  • 1Center for Excellence in Nanoscience, Key Laboratory of Nanosystem and Hierarchical Fabrication (CAS), National Center for Nanoscience and Technology, Beijing 100190, China.

Journal of the American Chemical Society
|April 16, 2024
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Summary

Researchers synthesized novel tethered aromatic lactams with unique helical structures. These compounds exhibit guest-adaptive hosting capabilities, particularly for fullerenes, and show potential as circularly polarized luminescence emitters.

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Area of Science:

  • Organic Chemistry
  • Supramolecular Chemistry
  • Materials Science

Background:

  • Tethered nonplanar aromatics (TNAs) are a significant class of compounds with unique properties, but their synthesis and characteristics are not fully understood.
  • Existing knowledge on the synthesis, structures, and properties of TNAs is limited, highlighting a need for further research.

Purpose of the Study:

  • To synthesize a new class of TNAs, specifically tethered aromatic lactams, using palladium-catalyzed reactions.
  • To investigate the structural, hosting, and chiroptical properties of these novel TNAs.
  • To demonstrate the guest-adaptive hosting capability of TNAs for the first time.

Main Methods:

  • Synthesis of tethered aromatic lactams via Pd-catalyzed consecutive intramolecular direct arylations.
  • Structural and host-guest interaction analysis using X-ray crystallography, theoretical calculations, fluorescence titration, and NMR titration.
  • Evaluation of chiroptical properties and circularly polarized luminescence (CPL) potential.

Main Results:

  • Successful synthesis of tethered aromatic lactams featuring helical ladder-type conjugated systems of up to 13 fused rings with overall yields of 3.4–4.3%.
  • The largest synthesized lactam, 6L-Bu-C, demonstrated unprecedented guest-adaptive hosting capabilities, with its cavity adapting to fullerene guests.
  • Stronger binding affinity of 6L-Bu-C for C70 over C60 was observed, attributed to enhanced convex-concave π-π interactions.
  • Distinct and persistent chiroptical properties were observed for both P and M enantiomers.

Conclusions:

  • Tethered aromatic lactams represent a novel and synthetically accessible class of TNAs with complex helical structures.
  • These compounds exhibit remarkable guest-adaptive hosting abilities, paving the way for new supramolecular applications.
  • The distinct chiroptical properties of enantiopure TNAs highlight their potential as efficient circularly polarized luminescence emitters.