摘要
在超临界二氧化碳中,利用马来酸锌催化二氧化碳与环氧化物反应合成环状碳酸酯.单独使用马来酸锌作为催化剂时,对二氧化碳与环氧丙烷反应的催化活性较低,而在DBU、DMAP、三乙胺、吡啶、咪唑或4-氨基吡啶等有机碱的存在下,反应活性较高,产物的收率得到明显提高.有机碱作用的强弱顺序为DBU>Et3N>咪唑>4-氨基吡啶>DMAP>吡啶.在压力为8MPa,温度110℃,反应时间48h条件下,马来酸锌与DBU组成的二元催化系统可以催化二氧化碳与环氧丙烷反应,得到83·4%产率的碳酸丙烯酯.该二元系统也能催化其它环氧化物高产率地转化为相应的环状碳酸酯.
Under supercritical carbon dioxide conditions, the reaction of carbon dioxide and epoxides oc- curred with zinc maleate as the catalyst. Zinc maleate as a sole catalyst showed a low catalytic activity. The coexistence of organic bases, such as DBU, trietbylamine （Et3N）, imidazole, pyridin-4-ylamine, DMAP or pyridine, could promote this reaction, and the yields of the product were increased obviously. The activity or-der of organic bases as a function of cocatalyst was DBU 〉 Et3N 〉 imidazole 〉 4-aminopyridine 〉 DMAP 〉 pyri-dine. Propylene carbonate could be obtained in 83.4% yield at 110℃ under 8 MPa of carbon dioxide pres-sure for 48 h in the presence of the binary catalyst system of zinc maleate and DBU. A verity of epoxides could also be transformed to the corresponding cyclic carbonates with a high yield in the presence of the binary cata-lyst system.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2007年第6期1084-1087,共4页
Chemical Journal of Chinese Universities
基金
国家自然科学基金(批准号:20332030
20572027和20625205)资助
关键词
马来酸锌
环氧化物
超临界二氧化碳
环状碳酸酯
合成
Zinc maleate ： Epoxides
Supercritical carbon dioxide
Cyclic carbonate
Synthesis
