Design of task-specific ionic liquids for catalytic conversion of CO2 with aziridines under mild conditions
作者:Ya-Nan Zhao、Zhen-Zhen Yang、Si-Hang Luo、Liang-Nian He
DOI:10.1016/j.cattod.2012.04.006
日期:2013.2
were developed as recyclable and efficient catalysts for selective synthesis of 5-aryl-2-oxazolidinones from aziridines and CO2 without addition of any organic solvents or additives. In particular, high yields, chemo- and regio-selectivities of oxazolidinones were attained when BrDBNPEG150DBNBr (DBN: 1,5-diazabicyclo[4.3.0]non-5-ene) was used as the catalyst, presumably due to activation of CO2 by the
开发了一系列聚乙二醇(PEG)-官能化的离子液体(IL),作为可回收和有效的催化剂,用于从氮丙啶和CO 2选择性合成5-芳基-2-恶唑烷酮,而无需添加任何有机溶剂或添加剂。特别地,当使用BrDBNPEG 150 DBNBr(DBN:1,5-二氮杂双环[4.3.0] non-5-ene)作为催化剂时,恶唑烷酮的产率高,化学选择性和区域选择性高,这可能是由于活化了通过PEG主链中的醚键产生CO 2,并通过离域阳离子BrDBNPEG 150 DBN +稳定氮丙啶的开环物质。此外,该催化剂可以重复使用超过四个连续周期,而不会明显丧失催化活性和选择性。还详细研究了催化剂结构和各种反应参数对催化剂性能的影响。结果表明,该催化剂对各种氮丙啶均能很好地产生相应的恶唑烷酮,并具有良好的产率和极好的区域选择性。因此,这种无溶剂的方法因此可以代表将IL 2催化的CO 2转化为增值化学品的环保方法。