Anchored [RuCl2(p-cymene)]2 in hybrid zirconium phosphate–phosphonate coated and pillared with double-stranded hydrophobic linear polystyrene as heterogeneous catalyst suitable for aqueous asymmetric transfer hydrogenation
作者:Rui Wang、Jingwei Wan、Xuebing Ma、Xiao Xu、Liu Liu
DOI:10.1039/c3dt33015j
日期:——
an N′-alkylated TsDPEN chiral ligand and double-stranded polystyrene chains were prepared for the first time using simple radical copolymerization of 1-phosphonate styrene with (R,R)-N′-4′-vinylbenzyl-N-4-vinylbenzenesulfonyl-1,2-diphenylethylene-1,2-diamine. Through the coprecipitation of their supported Ru polystyrene copolymers 2a–e and NaH2PO4 with ZrOCl2, pillared hybrid zirconium phosphate–phosphonate-anchored
一种新的类型的含膦酸盐的聚苯乙烯共聚物的1A-E轴承的Ñ '烷基化TsDPEN手性配体和用1 -膦酸酯的简单的自由基共聚首次制备双链聚苯乙烯链苯乙烯用(- [R ,- [R )- ñ '-4'-乙烯苄基Ñ -4-乙烯基苯-1,2-二苯基-1,2-二胺。通过它们的负载型Ru聚苯乙烯共聚物2a–e和NaH 2 PO 4与ZrOCl 2的共沉淀,形成柱状杂化体磷酸锆获得了作为膦酸酯锚定的Ru催化剂3a-e和4d 1 1-d 5 5,作为适用于水性不对称转移加氢的非均相催化剂。在芳族酮的水不对称转移加氢中,锚定的Ru催化剂表现出良好的催化活性,化学选择性(〜100%)和对映选择性(73.6%ee至95.6%ee)。钌催化剂甚至在第五次循环时间(92.2%转化率,92.1%ee)仍保持其催化性能。然而,由于在每个循环过程中钌的损失,相应的负载的Ru催化剂3d'导致令人失望的可重复使用性。芳族酮的转化