One‐Pot Synthesis of Disubstituted Urea from Carbon Dioxide, Propylene Oxide, and Amines Catalyzed by Imidazolium‐Tetraiodoindate

Bulletin of the Korean Chemical Society

Guang Meang Son¹  Cong Chien Truong²  Vivek Mishra³  Dinesh Kumar Mishra⁴ 

[1] Department of Chemistry Yonsei University Seoul 120749 Korea;Department of Green Process and System Engineering Korea University of Science and Technology (UST) Cheonan 31056 Korea;Green Chemistry Network Centre, Department of Chemistry University of Delhi Delhi 110007 India;Green Material and Process R&D Group Korea Institute of Industrial Technology (KITECH) Cheonan 31056 Korea

关键词: Disubstituted urea;    Amines;    Carbon dioxide;    Propylene oxide;    Ionic liquid‐;    based catalyst;   

DOI  :  10.1002/bkcs.11363

学科分类：化学（综合）

来源: Korean Chemical Society

【 摘 要 】

In this article, synthesis of 1,3‐disubstituted urea (DSU) from three component reagent systems comprising amine, carbon dioxide, and propylene oxide is described. DSU is synthesized in the presence of a variety of ionic liquids (ILs) with/without promoters. Among used ILs, 1‐butyl‐3‐methylimidazolium tetraiodoindateIII (represented as [Bmim][InI4]) is found to give the highest DSU product. A serious experiment clearly indicates that the tetraiodoindate anion plays an important role for the selective production of the DSU. Based on the in situ infrared spectroscopic studies, a plausible reaction mechanism for producing dicyclohexylurea from cyclohexylamine is proposed. The synthesis and characterization of [Bmim][InI4] are given in details. Moreover, the effect of reaction variables such as time, temperature, pressure, and the molar ratio of substrate to catalyst is also studied.

【 授权许可】

Unknown