Co (acac) 3/BMMImCl as a base-free catalyst system for clean syntheses of N, N′-disubstituted ureas from amines and CO2

J Li, XG Guo, LG Wang, XY Ma, QH Zhang, F Shi…

Index: Li, Jian; Guo, Xiaoguang; Wang, Liguo; Ma, Xiangyuan; Zhang, Qinghua; Shi, Feng; Deng, Youquan Science China Chemistry, 2010 , vol. 53, # 7 p. 1534 - 1540

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Citation Number: 10

Abstract

Abstract A base-free catalyst system Co (acac) 3/BMMImCl was developed for the carbonylation of amines with CO 2. 45%\ 2-81% isolated yields for N, N-dialkylureas and 6%\ 2-23% isolated yields for N, N-diarylureas were obtained. The catalyst system was recovered and reused without significant loss in activity. In this catalyst system, the base catalyst and chemical dehydrant were efficiently avoided. Different reaction conditions ...