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Related Concept Videos

Aromatic Compounds: Overview01:25

Aromatic Compounds: Overview

11.0K
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...
11.0K
Criteria for Aromaticity and the Hückel 4n + 2 Rule01:20

Criteria for Aromaticity and the Hückel 4n + 2 Rule

10.9K
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...
10.9K
Aromatic Hydrocarbon Anions: Structural Overview01:18

Aromatic Hydrocarbon Anions: Structural Overview

2.8K
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...
2.8K
Frost Circles for Different Conjugated Systems01:18

Frost Circles for Different Conjugated Systems

2.8K
The inscribed polygon method is consistent with Hückel’s 4n + 2 rule and helps to learn whether the given cyclic compound is aromatic or not. The compound is stable and aromatic if every bonding molecular orbital (MO) is completely filled with a pair of electrons. However, if the non-bonding or antibonding orbitals are filled with electrons, the compound is unstable and not aromatic. Consider the Frost circle diagrams for cycloalkenes containing 4 to 8 carbons.
2.8K
NMR Spectroscopy of Aromatic Compounds01:14

NMR Spectroscopy of Aromatic Compounds

4.8K
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.
4.8K
Five-Membered Heterocyclic Aromatic Compounds: Overview01:13

Five-Membered Heterocyclic Aromatic Compounds: Overview

4.0K
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,...
4.0K

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Related Experiment Video

Updated: Jul 28, 2025

Author Spotlight: Exploring Tea Aroma Using Solvent-Assisted Flavor Evaporation Technique
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A focus on aromaticity: fuzzier than ever before?

Henrik Ottosson1

  • 1Department of Chemistry - Ångström, Uppsala University Box 523 Uppsala 751 20 Sweden henrik.ottosson@kemi.uu.se.

Chemical Science
|June 2, 2023
PubMed
Summary

Aromaticity research has expanded significantly, introducing new computational tools and molecular classes. This vital field prompts critical questions about who benefits from the evolving, broader concept of aromaticity.

Area of Science:

  • Organic Chemistry
  • Computational Chemistry
  • Chemical Bonding Theory

Background:

  • The field of aromaticity has experienced five-fold growth in the last two decades.
  • Numerous computational tools for aromaticity analysis have emerged.
  • Novel molecular classes with aromatic or antiaromatic features are being explored experimentally.

Purpose of the Study:

  • To examine the current state and future direction of aromaticity research.
  • To investigate the beneficiaries of the expanding and potentially "fuzzier" concept of aromaticity.
  • To foster a deeper understanding of the chemical-bonding phenomenon of aromaticity.

Main Methods:

  • Review of recent advancements in aromaticity research.
  • Analysis of the impact of new computational tools and experimental findings.

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  • Discussion of the philosophical and practical implications of aromaticity definitions.

    • Main Results:

    • The field of aromaticity is characterized by rapid growth and increased complexity.
    • The concept of aromaticity is broader and potentially less defined than ever before.
    • Ongoing debates highlight the vitality and productivity of aromaticity research.

    Conclusions:

    • The expanding nature of aromaticity necessitates a critical examination of its utility and beneficiaries.
    • Understanding who benefits from a "fuzzy" aromaticity concept is crucial.
    • The field is poised for a more refined comprehension of aromaticity as a chemical-bonding phenomenon.