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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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Benzene to Phenol via Cumene: Hock Process01:27

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The synthesis of phenol from benzene via cumene and cumene hydroperoxide is called the Hock process. First, a Friedel–Crafts alkylation reaction of benzene with propene gives cumene. Then cumene forms cumene hydroperoxide via a radical chain reaction. In the chain initiation step, the benzylic hydrogen is abstracted to give a benzylic radical. In the chain propagation step, the benzylic radical reacts with an oxygen diradical to form a cumene hydroperoxide radical. The cumene...
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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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Nomenclature of Aromatic Compounds with a Single Substituent01:23

Nomenclature of Aromatic Compounds with a Single Substituent

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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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NMR Spectroscopy of Benzene Derivatives01:34

NMR Spectroscopy of Benzene Derivatives

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Simple unsubstituted benzene has six aromatic protons, all chemically equivalent. Therefore, benzene exhibits only a singlet peak at δ 7.3 ppm in the 1H NMR spectrum. The observed shift is far downfield because the aromatic ring current strongly deshields the protons. Any substitution on the benzene ring makes the aromatic protons nonequivalent, and the protons split each other. The peak is, therefore, no longer a singlet and the splitting pattern and their associated coupling...
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Hydrolysis of Chlorobenzene to Phenol: Dow Process01:10

Hydrolysis of Chlorobenzene to Phenol: Dow Process

2.9K
Simple aryl halides do not react with nucleophiles under normal conditions. However, the reaction can proceed under drastic conditions involving high temperatures and high pressure to give the substituted products. For example, chlorobenzene is converted to phenol using aqueous sodium hydroxide at 350 °C under high pressure by the Dow process. The reaction follows an elimination-addition mechanism involving a benzyne intermediate. Here, the chloride ion is...
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Hydroxycinnamaldehyde-derived benzofuran components in lignins.

Koichi Yoshioka1,2, Hoon Kim1,2, Fachuang Lu1,2

  • 1The US Department of Energy's Great Lakes Bioenergy Research Center, University of Wisconsin, Madison, WI 53726, USA.

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|September 29, 2023
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Researchers identified previously overlooked hydroxycinnamaldehyde-derived benzofuran structures in lignin using NMR. These findings offer new insights into lignin composition and biosynthesis.

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Area of Science:

  • Plant Biology
  • Polymer Chemistry
  • Biochemistry

Background:

  • Lignin, a major plant polymer, is primarily formed from monolignols via radical coupling.
  • Hydroxycinnamaldehyde units are minor lignin components, with elevated levels observed in specific plant mutants.
  • Nuclear Magnetic Resonance (NMR) spectroscopy is crucial for analyzing lignin structure.

Purpose of the Study:

  • To identify and characterize previously unrecognized structural units within lignin.
  • To investigate the formation and detection of hydroxycinnamaldehyde-derived moieties in lignin.
  • To leverage advanced NMR techniques for detailed lignin structural analysis.

Main Methods:

  • Utilized 2D 1H-13C-correlated NMR spectroscopy to analyze lignin.
  • Performed biomimetic radical coupling reactions with coniferaldehyde.
  • Isolated and characterized low-molecular-weight lignin oligomers.

Main Results:

  • Identified distinct and dispersed NMR correlation peaks corresponding to hydroxycinnamaldehyde-derived benzofuran moieties.
  • Demonstrated that coniferaldehyde coupling preferentially leads to disproportionation, forming benzofurans instead of extending the polymer chain.
  • Showed that these benzofuran structures are readily detectable in various lignin types via NMR.

Conclusions:

  • Hydroxycinnamaldehyde-derived benzofurans are significant, previously overlooked components of lignin.
  • NMR spectroscopy provides a powerful tool for their detection and quantification.
  • These findings enhance our understanding of lignin biosynthesis and structural diversity.