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Phase II Reactions: Methylation Reactions01:17

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Methylation is a phase II biotransformation process involving the attachment of a methyl group to a substrate. Enzymes known as methyltransferases orchestrate this reaction.
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Multiply exo-Methylated Corannulenes.

Kazuhira Miwa1, Shinobu Aoyagi1, Toru Amaya1

  • 1Department of Information and Basic Science Graduate School of Science, Nagoya City University, Nagoya, 467-8501, Japan.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|June 11, 2023
PubMed
Summary

Researchers developed a new method to add multiple methyl groups to corannulene molecules. This controlled synthesis technique enables the creation of novel, functionalized fullerene derivatives for advanced applications.

Keywords:
alkylationcorannulenedimethyl sulfatemethylationsodium dispersion

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Area of Science:

  • Organic Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Corannulene, a bowl-shaped polycyclic aromatic hydrocarbon, possesses a unique curved π-conjugated surface.
  • Functionalization of corannulene is crucial for developing advanced materials and molecular devices.
  • Previous methods for methylating corannulene were limited in scope and efficiency.

Purpose of the Study:

  • To develop a novel in-situ iterative reduction/methylation sequence for multiply methylating corannulene.
  • To synthesize exo-di-, -tetra-, and -hexamethylated corannulenes.
  • To characterize the molecular structures and understand the sequence of multimethylation.

Main Methods:

  • In-situ iterative reduction/methylation sequences using sodium and dimethyl sulfate.
  • X-ray diffraction analysis for structural determination.
  • Nuclear Magnetic Resonance (NMR), Mass Spectrometry (MS), and UV-Vis spectroscopy for characterization.
  • Density Functional Theory (DFT) calculations for mechanistic insights.

Main Results:

  • Successful synthesis of exo-di-, -tetra-, and -hexamethylated corannulenes.
  • Elucidation of the molecular structures and the step-by-step methylation process.
  • Demonstration of a controlled method for achieving multiple substitutions on the corannulene surface.

Conclusions:

  • The developed in-situ iterative reduction/methylation sequence is effective for controlled multimethylation of corannulene.
  • This methodology provides a pathway for synthesizing structurally defined, multifunctionalized fullerene derivatives.
  • The findings contribute to the broader field of fullerene chemistry and the design of novel organic materials.