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Regular Claisen condensation involves the synthesis of β-ketoesters by combining identical ester molecules bearing two α hydrogens in the presence of an alkoxide base. The reaction commences with the deprotonation of the acidic α hydrogen by the base to form a resonance stabilized ester enolate. This nucleophilic ion then attacks the carbonyl center of another ester molecule to generate a tetrahedral alkoxide intermediate. Next, the expulsion of the alkoxide group from the...
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Copper-Mediated Conversion of Complex Ethers to Esters: Enabling Biopolymer Depolymerisation under Mild Conditions.

Ganyuan Xiao1, James R D Montgomery1, Christopher S Lancefield1

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Chemistry (Weinheim an Der Bergstrasse, Germany)
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Summary

Researchers developed a new method to modify lignin's β-O-4 units into esters. This enables mild depolymerization conditions, yielding valuable aryl acid monomers for biorefineries.

Keywords:
TEMPO oxidationbiomasscopperligninmild depolymerization

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Area of Science:

  • Biomass Conversion
  • Polymer Chemistry
  • Organic Synthesis

Background:

  • Lignin depolymerization is key for biorefineries.
  • Selective cleavage of the β-O-4 linkage is crucial.
  • Current methods often require harsh conditions.

Purpose of the Study:

  • To develop a mild method for lignin depolymerization.
  • To modify the β-O-4 unit to facilitate cleavage.
  • To produce valuable aryl acid monomers.

Main Methods:

  • Modification of β-O-4 units to carboxylic esters.
  • Utilizing a Cu/TEMPO/O2 catalytic system.
  • Application to dimeric and oligomeric lignin model compounds.
  • Analysis using 2D NMR spectroscopy.

Main Results:

  • High yield of β-O-4 containing esters from model compounds.
  • Successful analogous chemistry on oligomeric lignin models.
  • Mild depolymerization of ester-containing oligomers.
  • Isolation of aryl acid monomers.

Conclusions:

  • The developed esterification strategy enables mild lignin depolymerization.
  • This approach is effective for both dimeric and oligomeric lignin models.
  • The method provides a pathway to valuable aryl acid monomers for biorefineries.