A heterogenized chiral imino indanol complex of manganese as an efficient catalyst for aerobic epoxidation of olefins
作者:Vahideh Abbasi、Hassan Hosseini-Monfared、Seyed Majid Hosseini
DOI:10.1039/c7nj00670e
日期:——
selectivity in the epoxidation of olefins with oxygen in the presence of isobutyraldehyde under mild conditions (conversion 38–98%; selectivity 65–98%; and enantioselectivity 58–100%, except for alpha-methylstyrene). Furthermore, the synergistic effect of the reduced graphene oxide support was observed on the increasing activity, epoxide selectivity, and enantioselectivity. The catalyst can be recovered
在此,通过将复合物[Mn(L)(OH)]接枝到碳包覆的磁性Fe 3 O 4纳米粒子修饰的还原氧化石墨烯上,合成了一种新型的非均相手性催化剂,GFC- [Mn(L)(OH)]。胺键(L =(1R,2S)-1-(N-水杨亚氨基)-2-茚满醇)形成的薄板(GFC )。催化剂通过FT-IR,UV / vis,XRD,SEM和振动样品磁力计(VSM)技术。在温和的条件下,在异丁醛存在下,烯烃与氧气的环氧化反应中表现出出色的活性和选择性(转化率38-98%;选择性65-98%;对映选择性58-100%,α-甲基苯乙烯除外)。此外,观察到还原的氧化石墨烯载体对增加的活性,环氧化物选择性和对映选择性的协同作用。该催化剂可以回收通过从反应混合物中进行磁分离,并循环五次,而其活性没有任何重大损失。这种发展的优点是利用还原的氧化石墨烯和磁铁矿纳米颗粒的协同作用来获得易于回收的非均质绿色催化剂。另外,对配体的基于