N-substituted carbamates syntheses with alkyl carbamates as carbonyl source over Ni-promoted Fe3O4 catalyst
作者:Jianpeng Shang、Xiaoguang Guo、Feng Shi、Yubo Ma、Feng Zhou、Youquan Deng
DOI:10.1016/j.jcat.2011.01.030
日期:2011.4
magnetic iron oxide containing Ni with different nickel content were prepared with co-precipitation method and tested in the syntheses of N-substituted carbamates from various amines and alkyl carbamates. Under the optimized reaction conditions, various N-substituted carbamates were successfully synthesized with 90–98% isolated yield. The catalyst could be recovered based on the magnetic property of the catalyst
用共沉淀法制备了一系列含镍量不同的镍的磁性氧化铁催化剂,并在由各种胺和氨基甲酸烷基酯合成N-取代的氨基甲酸酯中进行了测试。在优化的反应条件下,成功合成了各种N-取代的氨基甲酸酯,分离产率为90-98%。可以基于催化剂的磁性来回收催化剂,并在不失活的情况下重复使用五次。通过X射线光电子能谱,X射线衍射,程序升温还原,程序升温脱附和Mössbauer光谱分析对催化剂进行了表征。结果表明,催化活性可能源于镍和铁物种之间细微的协同作用,导致特定的碱性位点。