首页|CeO2-catalyzed transformation of various amine carbamates into organic urea derivatives in corresponding amine solvent
CeO2-catalyzed transformation of various amine carbamates into organic urea derivatives in corresponding amine solvent
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A new catalytic system for the direct conversion of various amine carbamates into urea derivatives was devised by combining corresponding amine solvents with CeO2 catalyst.The amine solvents suppressed undesired thermal decomposition of amine carbamates,resulting in the high-yielding production of urea derivatives with high turnover frequency(TOF).One of the reactions demonstrated here was the conversion of ethylenediamine carbamate(EDA-CA)in an ethylenediamine(EDA)solvent.This system produced 2-imidazolidinone(62% yield)and N,N'-bis(2-aminoethyl)urea(38% yield,including its related compounds).The TOF based on the catalyst amount for the EDA-CA transformation was 3.7 h,which was at least 6-fold higher than those in previously reported systems operated in different organic solvents at similar reaction temperatures.In the presence of water additive,this catalytic system relying on the CeO2 catalyst and EDA solvent became slower than the reaction without water additive but could still produce the urea derivatives in high yields.
Organic urea derivativeAmine carbamateCO2 capture and utilizationCeO2 catalystNon-reductive transformation
Jie Peng、Yingai Li、Mizuho Yabushita
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Department of Applied Chemistry,School of Engineering,Tohoku University,6-6-07 Aoba,Aramaki,Aoba-ku,Sendai,Miyagi 980-8579,Japan
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