A base-free catalyst system Co(acac)3/BMMImCl was developed for the carbonylation of amines with CO2. 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 were also discussed and a postulated mechanism was proposed.
一种无碱催化剂系统Co(acac)3/BMMImCl被开发用于
二氧化碳与胺的羰基化反应。N,N-二烷基
尿素的分离产率为45%\至81%,N,N-二芳基
尿素的分离产率为6%\至23%。该催化剂系统可以回收再用,活性损失不显著。在这个催化剂系统中,有效避免了碱催化剂和
化学脱
水剂。还讨论了不同的反应条件,并提出了一个假设的机制。