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Five-Membered Heterocyclic Aromatic Compounds: Overview

Five-Membered Heterocyclic Aromatic Compounds: Overview

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, respectively.

Aromatic Hydrocarbon Cations: Structural Overview

Aromatic Hydrocarbon Cations: Structural Overview

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 with both...

Aromatic Hydrocarbon Anions: Structural Overview

Aromatic Hydrocarbon Anions: Structural Overview

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 overlap of p...

Aromatic Compounds: Overview

Aromatic Compounds: Overview

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 benzene...

Criteria for Aromaticity and the Hückel 4n + 2 Rule

Criteria for Aromaticity and the Hückel 4n + 2 Rule

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 Hückel’s rule or the 4n + 2 rule.

NMR Spectroscopy of Aromatic Compounds

NMR Spectroscopy of Aromatic Compounds

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. Consider...

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Characterization, Quantification and Compound-specific Isotopic Analysis of Pyrogenic Carbon Using Benzene Polycarboxylic Acids (BPCA)

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A convergent approach to polycyclic aromatic hydrocarbons.

Raphaël F Guignard¹, Samir Z Zard

¹Laboratoire de Synthèse Organique, CNRS UMR 7652, Ecole Polytechnique, F-91128 Palaiseau, France.

Chemical Communications (Cambridge, England)

|October 15, 2011

Summary

Researchers developed a new, short method for synthesizing Polycyclic Aromatic Hydrocarbons (PAHs). This approach utilizes radical addition and cyclization reactions involving xanthates, offering an efficient pathway to these important compounds.

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Area of Science:

Organic Chemistry
Synthetic Chemistry

Background:

Polycyclic Aromatic Hydrocarbons (PAHs) are crucial in materials science and medicinal chemistry.
Existing synthetic routes to PAHs can be lengthy and inefficient.

Purpose of the Study:

To develop a novel and concise synthetic strategy for accessing Polycyclic Aromatic Hydrocarbons (PAHs).
To explore the utility of xanthate chemistry in constructing PAH frameworks.

Main Methods:

Radical addition reactions involving xanthate precursors.
Intramolecular cyclization to form polycyclic systems.
Optimization of reaction conditions for yield and purity.

Main Results:

A new, streamlined synthetic route to various PAHs was established.
The method demonstrated efficiency and good yields for target PAH synthesis.
The radical cyclization of xanthates proved effective for constructing complex PAH structures.

Conclusions:

The described method provides a concise and effective approach for PAH synthesis.
This xanthate-based strategy offers a valuable alternative to existing synthetic methodologies.
The developed route has potential for broader applications in organic synthesis.