| 研究実績の概要 |
1) During several attempts to synthesize active and stable catalyst for CO2 insertion reaction, we successfully synthesized pyridine stabilized heterogenous Ag catalyst on functionalized hydrotalcite. The catalyst prepared was quite stable and could be stored without the need of protective atmosphere. The catalytic system performed the cyclization of propargyl amines with CO2 forming a wide variety of oxazolidinones in atmospheric pressure of CO2 and room temperature.
2) More importantly, we could synthesize heterogenous bifunctional SiO2 based catalyst through functionalization of cheap silica with imidazole based ligand. The imidazolinium salt acted as ligand for metal and activator for substrate and CO2. With this bifunctional system, cyclic carbonates were prepared using propargyl alcohols under mild reaction condition. Our system provided green route for this reaction without any additive such as organic and inorganic bases.
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