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Comprehensive Mapping of Compositional Dynamics in the Formose Reaction Network.

Hiroaki Nishijima1, Hiro Tabata1,2, Yoko Hase3

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This study visualizes the complex products of the formose reaction, a key chemical reaction network. Understanding product composition aids in controlling reactions and improving yields of desired monosaccharides.

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Area of Science:

  • Chemistry
  • Chemical Engineering
  • Organic Chemistry

Background:

  • The formose reaction, a non-enzymatic chemical reaction network (CRN), synthesizes monosaccharides from formaldehyde.
  • A significant portion of formaldehyde is converted into non-target products, known as "tar," with unexplored compositional evolution.
  • Understanding the complex product landscape is crucial for optimizing CRNs.

Purpose of the Study:

  • To visualize the compositional landscape of target and non-target products in the formose reaction.
  • To analyze the influence of different catalysts (NaOH and Ca(OH)2) on product distribution.
  • To develop a framework for understanding and controlling complex CRNs.

Main Methods:

  • Utilized high-resolution mass spectrometry to analyze reaction products.
  • Applied van Krevelen (VK) diagrams and Kendrick mass defect (KMD) plots for compositional visualization.
  • Compared product distributions under NaOH and Ca(OH)2 catalysis.

Main Results:

  • NaOH catalysis resulted in low selectivity and a wide variety of non-target products.
  • Ca(OH)2 catalysis showed predominant dehydration-type side reactions in later stages.
  • Product distribution was found to be highly dependent on the catalyst and reaction stage.

Conclusions:

  • The developed visualization framework effectively characterizes complex CRN product compositions.
  • Catalyst and stage-dependent product distribution offers insights for reaction control strategies.
  • Suppressing dehydration can potentially improve target monosaccharide yield with Ca(OH)2 catalysis.