123rd General Meeting of the KCS

Type Oral Presentation
Area Oral Presentation of Young Inorganic Chemists
Room No. Room 401+402
Time THU 09:40-09:50
Code INOR.O-5
Subject A New Class of Bifunctional One–component Catalysts for the Synthesis of Cyclic Carbonates
Authors Yoseph Kim, Seol Ryu1, Youngjo Kim*
Department of Chemistry, Chungbuk Natioanl University, Korea
1Department of Chemistry, Chosun University, Korea
Abstract At this seminar, I want to talk about a new class of halide–free and bifunctional one–component catalysts for the coupling of CO2 with epoxides. These catalysts do not need halide–based additives or tethered salts attached to ligand when used for this coupling reaction. As the halide–free and bifunctional one–component catalysts, nonionic and monomeric tetracarbonylchromium(0), tetracarbonylmolybdenum(0), and tetracarbonyltungsten(0) complexes chelated by modified ethylenediamines were chosen. In addition, we will directly compare the catalytic activity of simple mixture of M(CO)6 (M = Cr, Mo, and W) and the modified ethylenediamines with the catalytic activity of the synthesized tetracarbonyl metal complexes precoordinated to the corresponding modified ethylenediamines. We found that increasing the number of methyl substituents on the nitrogen atoms of the ethylenediamine derivatives as well as the chromium metal center in the metal carbonyl complex significantly enhanced the catalytic activity. Furthermore, we will show that various terminal and internal epoxides were easily converted into the corresponding cyclic carbonates using our system. Finally, calculations based on density functional theory were also carried out to elucidate the mechanism of the coupling reaction.
E-mail armadajo@chungbuk.ac.kr