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Related Concept Videos

Aromatic Compounds: Overview01:25

Aromatic Compounds: Overview

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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...
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Nomenclature of Aromatic Compounds with a Single Substituent01:23

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Benzene is the simplest aromatic hydrocarbon or arene. The IUPAC names for simple monosubstituted benzene derivatives are derived by adding the substituent's name as a prefix to the parent benzene. For example, halobenzene, where the halogen could be fluoro (F), chloro (Cl), bromo (Br), and iodo (I).
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Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation01:28

Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation

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Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...
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Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism01:18

Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism

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Birch reduction uses solvated electrons as reducing agents. The reaction converts benzene to 1,4-cyclohexadiene. The reaction proceeds by the transfer of a single electron to the ring to form a benzene radical anion. This anion is highly basic—it abstracts a proton from the alcohol to form a cyclohexadienyl radical. Another single electron transfer gives the cyclohexadienyl anion. A proton transfer from the alcohol forms 1,4-cyclohexadiene. Since this reduction occurs via radical anion...
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Frost Circles for Different Conjugated Systems01:18

Frost Circles for Different Conjugated Systems

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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.
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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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Related Experiment Video

Updated: Jun 12, 2025

Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer
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Benzenoid Aromatics from Renewable Resources.

Shasha Zheng1, Zhenlei Zhang2, Songbo He3

  • 1Leibniz Institut für Katalyse e.V., Albert-Einstein-Strasse 29a, 18059 Rostock, Germany.

Chemical Reviews
|September 17, 2024
PubMed
Summary
This summary is machine-generated.

This review summarizes chemical methods for converting renewable resources into benzenoid aromatics. Key pathways include catalytic fast pyrolysis and multistep conversions of platform chemicals, with notable success in lignocellulose to xylene production.

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Area of Science:

  • Chemical Engineering
  • Sustainable Chemistry
  • Biomass Conversion

Background:

  • Growing demand for sustainable chemical production.
  • Need for efficient conversion of diverse renewable feedstocks.
  • Limited availability of traditional aromatic sources.

Purpose of the Study:

  • To comprehensively review chemical methods for producing benzenoid aromatics from renewable resources.
  • To analyze different feedstock types and conversion strategies.
  • To highlight advancements and industrial applications.

Main Methods:

  • Catalytic fast pyrolysis at high temperatures (300–700 °C).
  • Multistep chemical conversion of platform chemicals derived from biomass (e.g., lignocellulose, sugars).
  • Focus on furanic compounds like furfural and 5-hydroxymethylfurfural.

Main Results:

  • Pyrolysis yields biochar, gases, and aromatic-rich oil; selectivity varies with feedstock.
  • Multistep routes show promise, particularly for lignocellulose conversion.
  • Successful industrial-scale production of xylene from lignocellulose via 5-chloromethylfurfural and dimethylfuran.

Conclusions:

  • Chemical conversion of renewables offers a viable route to benzenoid aromatics.
  • Catalytic fast pyrolysis and multistep synthesis are key strategies.
  • Industrial implementation demonstrates the feasibility of biomass-derived aromatics.