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Catalysis Organic Chemistry

  • Makoto Tokunaga, Professor
  • Haruno Murayama, Associate Professor
  • Eiji Yamamoto, Assistant Professor
Our group studies both on homogeneous and heterogeneous catalysis. Particularly, as homogeneous catalysts, we have applied chiral quaternary ammonium salts for asymmetric ester hydrolysis for the first time. On the other hand, supported noble metal nanoparticles are investigated for heterogeneous catalysis. We are developing a novel preparation method of supported Au nanoparticles, reactions for bulk chemical transformation and fine chemical syntheses. In addition, adsorptive desulfurization from beverages and fuels have been investigated.

Chiral quaternary ammonium salts for asymmetric hydrolysis catalysts

Figure 1

Under biphasic conditions consists of an organic solvent and an aqueous basic solution, asymmetric hydrolysis of esters proceeds with chiral quaternary ammonium salts. This catalyst provides chiral OH– like species to distinguish enantioface and enantiomers.

Novel preparation method of supported Au nanoparticles

Figure 2

Au nanoparticles are important materials for nanotechnology. However, acidic oxides including SiO2 were difficult support to deposit Au nanoparticles. We have developed a novel preparation method using Au-amino acid complexes as a precursor for impregnation method.

Equation 1