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Aromatic Compounds: Overview01:25

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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.
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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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Lipid Catabolism

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Triglycerides serve as crucial long-term energy storage molecules in microorganisms, providing a dense source of metabolic energy. Their breakdown is mediated by lipases, which hydrolyze triglycerides into glycerol and free fatty acids. Each of these components follows distinct metabolic pathways, ultimately contributing to ATP synthesis and cellular energy homeostasis.Glycerol MetabolismGlycerol, released from triglyceride hydrolysis, is phosphorylated by glycerol kinase to form...
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Introduction
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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
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Updated: Dec 29, 2025

Extraction of Lignin with High &#946;-O-4 Content by Mild Ethanol Extraction and Its Effect on the Depolymerization Yield
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Catalytic Lignin Depolymerization to Aromatic Chemicals.

Chaofeng Zhang1, Feng Wang1

  • 1State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy , Dalian Institute of Chemical Physics, Chinese Academy of Sciences , Dalian 116023 , China.

Accounts of Chemical Research
|January 31, 2020
PubMed
Summary
This summary is machine-generated.

Researchers developed a new strategy for lignin depolymerization, converting biomass into valuable aromatic chemicals. This method focuses on modifying adjacent functional groups to selectively break lignin bonds, offering a profitable alternative to fuel production.

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Area of Science:

  • Biomass Conversion and Valorization
  • Catalysis and Green Chemistry
  • Organic Chemistry and Polymer Science

Background:

  • Lignin, an abundant renewable resource, holds potential for producing valuable aromatic compounds.
  • Direct lignin depolymerization to monomers is challenging due to complex structure, stable bonds, and condensation reactions.
  • Producing high-value aromatic chemicals from lignin is more profitable than conversion to liquid fuels.

Purpose of the Study:

  • To present recent studies on the catalytic conversion of lignin into aromatic chemicals.
  • To introduce a novel adjacent functional group modification (AFGM) strategy for lignin model conversion.
  • To explore strategies for efficient lignin depolymerization, focusing on promoting conversion and preventing condensation.

Main Methods:

  • Investigated protolignin depolymerization using a fragmentation-hydrogenolysis process in alcohol solvents.
  • Developed and applied the adjacent functional group modification (AFGM) strategy to cleave lignin C-C and C-O bonds.
  • Analyzed the effects of lignin structure, catalyst properties, and reaction conditions on depolymerization efficiency.

Main Results:

  • Demonstrated the effectiveness of the AFGM strategy in decreasing bond dissociation enthalpy and facilitating targeted bond cleavage.
  • Highlighted the importance of promoting lignin conversion while simultaneously restraining condensation reactions for efficient aromatic production.
  • Showcased a bottom-up research approach using lignin models to clarify conversion mechanisms and develop methods for protolignin/technical lignin.

Conclusions:

  • The developed strategies offer a promising pathway for the selective depolymerization of lignin into valuable aromatic monomers.
  • Lignin-derived aromatic compounds can serve as monomers for artificial polymerization or as building blocks for high-value synthetic materials.
  • This research provides insights into efficient lignin valorization, contributing to a more sustainable chemical industry.