Binaphthyl sulfonimides have been developed to catalyze the asymmetric Michael addition of ketone to alky- lidene malonates, affording the corresponding Michael products in good to high yields （up to 98%） with good ...Binaphthyl sulfonimides have been developed to catalyze the asymmetric Michael addition of ketone to alky- lidene malonates, affording the corresponding Michael products in good to high yields （up to 98%） with good to excellent diastereoselectivity （up to 99 ; 1 dr） and enantioselectivity （up to 92% ee） under mild conditions using environmentally benign water as the solvent.展开更多
The novel perfluorinated vinyl ether containing sulfonimide functionality CF2 = CFORfSO2NHSO2CF3 was synthesized by multiple reaction steps. It could be copolymerized with tetraflu-oroethylene by radox initiator to gi...The novel perfluorinated vinyl ether containing sulfonimide functionality CF2 = CFORfSO2NHSO2CF3 was synthesized by multiple reaction steps. It could be copolymerized with tetraflu-oroethylene by radox initiator to give a novel perfluorinated ionomer polymer. Its physical and chemical properties were studied.展开更多
The novel perfluorinated vinyl ether containing sulfonimide and phosphonic acid functionalities, CF2 = CFOCF2CF(CF3)-OCF2CF2SO2NHSO2(CF2)2P(O)(OH)2, has been synthesized by multiple reaction steps. It is a very strong...The novel perfluorinated vinyl ether containing sulfonimide and phosphonic acid functionalities, CF2 = CFOCF2CF(CF3)-OCF2CF2SO2NHSO2(CF2)2P(O)(OH)2, has been synthesized by multiple reaction steps. It is a very strong bi-functional acid and exhibits a high degree of stability in aqueous solution at an elevated temperature. These properties make it an attractive monomer for the preparation of the co-polymer with TFE to obtain the high quality ionomer membrane and proton conductor.展开更多
基金Acknowledgment We are grateful for financial support from the National Natural Science Foundation of China （No. 21072020）, the Science and Technology Innovation Program of Beijing Institute of Technology （No. 2011CX01008） and the Development Program for Distinguished Young and Middle-aged Teachers of Beijing Institute of Technology.
文摘Binaphthyl sulfonimides have been developed to catalyze the asymmetric Michael addition of ketone to alky- lidene malonates, affording the corresponding Michael products in good to high yields （up to 98%） with good to excellent diastereoselectivity （up to 99 ; 1 dr） and enantioselectivity （up to 92% ee） under mild conditions using environmentally benign water as the solvent.
基金Project supported by the National Natural Science Foundation of China(Nos.20032010,20072049).
文摘The novel perfluorinated vinyl ether containing sulfonimide functionality CF2 = CFORfSO2NHSO2CF3 was synthesized by multiple reaction steps. It could be copolymerized with tetraflu-oroethylene by radox initiator to give a novel perfluorinated ionomer polymer. Its physical and chemical properties were studied.
文摘The novel perfluorinated vinyl ether containing sulfonimide and phosphonic acid functionalities, CF2 = CFOCF2CF(CF3)-OCF2CF2SO2NHSO2(CF2)2P(O)(OH)2, has been synthesized by multiple reaction steps. It is a very strong bi-functional acid and exhibits a high degree of stability in aqueous solution at an elevated temperature. These properties make it an attractive monomer for the preparation of the co-polymer with TFE to obtain the high quality ionomer membrane and proton conductor.
