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Related Concept Videos

Aromatic Compounds: Overview01:25

Aromatic Compounds: Overview

12.4K
In general, the term ‘aromatic’ indicates a pleasant smell or fragrance from fresh flowers, freshly prepared coffee, etc. In the early history of organic chemistry, many benzene derivatives were isolated from the pleasant odor oils of the plants. For example, vanillin was isolated from the oil of vanilla, methyl salicylate from the oil of wintergreen, and cinnamaldehyde from the oil of cinnamon. They all had a pleasant odor; hence the name aromatic was given.
In 1825, Faraday isolated...
12.4K
NMR Spectroscopy of Aromatic Compounds01:14

NMR Spectroscopy of Aromatic Compounds

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Aromatic compounds can be identified or analyzed using proton NMR and carbon‐13 NMR. Typically, aromatic hydrogens or hydrogens directly bonded to the aromatic rings are strongly deshielded by the aromatic ring current. Therefore, they absorb in the range of 6.5–8.0 ppm in proton NMR spectra. For instance, aromatic hydrogens directly bonded to the benzene ring absorb at 7.3 ppm. However, aromatic hydrogens of larger rings absorb farther upfield or downfield than the ideal range.
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Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

3.3K
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...
3.3K
IR Frequency Region: X–H Stretching01:24

IR Frequency Region: X–H Stretching

1.2K
In IR spectroscopy, signals produced by the X−H bonds (such as C−H, O−H, or N−H) can be observed in the frequency range of  2700–4000 cm–1. The C−H stretching vibration forms sharp bands in the region 2850–3000 cm–1. The presence of the O−H stretching vibration leads to the forming of an absorption band in the frequency range 3650–3200 cm−1. At the same time, N−H stretching can be confirmed by absorption bands in...
1.2K
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

3.4K
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.
Removing one hydrogen from the intervening CH2 group...
3.4K
Five-Membered Heterocyclic Aromatic Compounds: Overview01:13

Five-Membered Heterocyclic Aromatic Compounds: Overview

4.7K
Heterocyclic aromatic compounds are cyclic compounds that are aromatic and have one or more heteroatoms—atoms other than carbon, in the ring. Depending upon the number of atoms present in the ring, they can be either five or six-membered. Examples of five-membered heterocyclic aromatic compounds include pyrrole, furan, thiophene, and imidazole. Pyrrole consists of one nitrogen atom having one lone pair of electrons. Furan and thiophene have one oxygen and one sulfur heteroatom,...
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Isolation, Propagation, and Identification of Bacterial Species with Hydrocarbon Metabolizing Properties from Aquatic Habitats
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Aromatic hydrocarbon belts.

Qing-Hui Guo1,2, Yunyan Qiu1, Mei-Xiang Wang3

  • 1Department of Chemistry, Northwestern University, Evanston, IL, USA.

Nature Chemistry
|April 16, 2021
PubMed
Summary
This summary is machine-generated.

Synthesizing strained aromatic hydrocarbon belts (AHCBs) is challenging. Recent breakthroughs offer templates for uniform single-walled carbon nanotubes, advancing carbon nanotechnology.

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Area of Science:

  • Organic Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Aromatic hydrocarbon belts (AHCBs) have been of interest for over 50 years due to their unique structures and potential in carbon nanotechnology.
  • A key challenge in AHCB synthesis is managing the energy buildup in strained molecular architectures.
  • Successful synthesis of AHCBs could provide templates for creating uniform single-walled carbon nanotubes.

Purpose of the Study:

  • To review the historical development of rational design and synthesis strategies for AHCBs.
  • To highlight recent breakthroughs in constructing curved and fused benzenoid rings into molecular belts.
  • To discuss current scientific challenges and future prospects in AHCB research.

Main Methods:

  • Review of historical literature on AHCB synthesis.
  • Analysis of various synthetic strategies for building strained aromatic structures.
  • Discussion of potential applications and future research directions.

Main Results:

  • The review details the evolution of AHCB synthesis, from early concepts to modern approaches.
  • It highlights diverse strategies employed to assemble curved and fused aromatic systems into belts.
  • Recent advancements demonstrate progress in overcoming synthetic challenges.

Conclusions:

  • AHCB synthesis remains a complex but rewarding area of research.
  • The development of AHCBs is crucial for advancing nanocarbon science, particularly in nanotube fabrication.
  • Continued innovation in synthetic methodologies will drive future progress in this field.