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An Ion‐Pair Immobilization Strategy in Rhodium‐Catalyzed Asymmetric Transfer Hydrogenation of Aromatic Ketones
Author(s) -
Xu Yulong,
Cheng Tanyu,
Long Jie,
Liu Ketang,
Qian Qingqian,
Gao Fei,
Liu Guohua,
Li Hexing
Publication year - 2012
Publication title -
advanced synthesis and catalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.541
H-Index - 155
eISSN - 1615-4169
pISSN - 1615-4150
DOI - 10.1002/adsc.201200320
Subject(s) - rhodium , cationic polymerization , chemistry , catalysis , homogeneous , transfer hydrogenation , homogeneous catalysis , asymmetric hydrogenation , heterogeneous catalysis , organic chemistry , polymer chemistry , combinatorial chemistry , enantioselective synthesis , ruthenium , physics , thermodynamics
A chiral diamine‐based homogeneous cationic rhodium catalyst was developed and two heterogeneous cationic rhodium catalysts were obtained via the encapsulation of the homogeneous cationic rhodium catalyst within Me‐SBA‐15 and Me‐SBA‐16. All these catalysts presented excellent catalytic activities and high enantioselectivities in ultrasound‐promoted asymmetric transfer hydrogenation of aromatic ketones and represent a successful use of the ion‐pair immobilization strategy. More importantly, the encapsulation of the cationic rhodium functionality within Me‐SBA‐16 had an obvious high recyclability, in which the recycled catalyst could be reused nine times without significantly affecting its enantioselectivity, showing good potential in industrial application.