Mesoporous silica KIT-6 supported superparamagnetic CuFe2O4 nanoparticles for catalytic asymmetric hydrosilylation of ketones in air
Mesoporous silica KIT-6 supported superparamagnetic CuFe2O4 nanoparticles for catalytic asymmetric hydrosilylation of ketones in air
复制标题
介孔二氧化硅 KIT-6 负载的超顺磁性 CuFe2O4 纳米颗粒用于空气中酮的催化不对称氢化硅烷化
DOI：
10.1039/c3gc42638f
复制
发表时间：
2014-01-01
期刊：
影响因子：
9.8
通讯作者：
Shi, Yifeng
中科院分区：
文献类型：
--
作者：
Li, Min;Li, Bin;Shi, Yifeng
在非均相催化体系的存在下，多种前手性酮在空气中被还原，产率高，对映体选择性高(高达97%ee)，该非均相催化体系由负载在介孔二氧化硅KIT-6和非外消旋的联吡啶配体上的超顺磁性CuFe2O4纳米粒子、化学计量比的聚甲基硅氧烷(PMHS)以及一定量的添加剂原位形成。磁分离催化剂可重复使用4次，活性和对映体选择性均无明显损失。
A diverse range of prochiral ketones were reduced in air with high yields and good-to-excellent enantioselectivities (up to 97% ee) in the presence of a heterogeneous catalyst system, which was in situ formed from catalytic amounts of superparamagnetic CuFe2O4 nanoparticles supported on mesoporous silica KIT-6 and non-racemic dipyridylphosphine ligand, the stoichiometric hydride donor polymethylhydrosiloxane (PMHS) as well as certain amounts of additives. The magnetically separable catalysts could be efficiently reused 4 times without apparent loss of both the activity and enantioselectivity.