scholarly journals A novel thermoregulated phase-transfer catalysis system for chiral nano-Pt-catalyzed asymmetric hydrogenation

2021 ◽  
pp. 174751982110391
Author(s):  
Pu Chen ◽  
Yanhua Wang
Keyword(s):  
Ionic Liquid ◽  
Cloud Point ◽  
Phase Transfer Catalysis ◽  
Phase Transfer ◽  
Enantiomeric Excess ◽  
Asymmetric Hydrogenation ◽  
Biphasic System ◽  
Pt Catalyst ◽  
Chiral Ionic Liquid ◽  
Pt Catalyzed

The chiral ionic liquid CILTPT-MS [CH3(OCH2CH2)16CD]+[CH3SO3]− (CD = cinchonidine) is found to exhibit cloud point character. Due to this cloud point character, a CILTPT-MS-stabilized chiral nano-Pt catalyst is prepared and utilized to realize transfer in a H2O–1-pentanol biphasic system by simply changing the temperature. Therefore, a fluorine-free, thermoregulated phase-transfer catalysis system is developed and applied to the asymmetric hydrogenation of α-ketoesters with enantiomeric excess of >99% and excellent conversion. In addition, the chiral nano-Pt catalyst can be easily separated and reused efficiently.

Thermoregulated phase transfer catalysis in aqueous/organic biphasic system: facile and highly efficient ATRP catalyst separation and recycling in situ using typical alkyl halide as initiator

2015 ◽  
Vol 6 (35) ◽  
pp. 6394-6401 ◽  
Author(s):  
Xiaowu Jiang ◽  
Yanjing Luo ◽  
Zhen Li ◽  
Lifen Zhang ◽  
Zhenping Cheng ◽  
...  
Keyword(s):  
Phase Transfer Catalysis ◽  
Phase Transfer ◽  
Alkyl Halide ◽  
Biphasic System ◽  
Metal Catalyst ◽  
Highly Efficient ◽  
Important Development ◽  
Catalyst Separation ◽  
First Time

An important development of TRPTC-based ICAR ATRP for metal catalyst separation and recycling in an aqueous/organic biphasic system was achieved with alkyl halide as the initiator for the first time.

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