Journal
CATALYSIS COMMUNICATIONS
Volume 81, Issue -, Pages 50-53Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.catcom.2016.04.006
Keywords
Asymmetric cycloaddition; Chiral oligomer catalyst; Carbon dioxide; Epoxide; Kinetic resolution
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Funding
- National Natural Science Foundation of China [NSFC 20973086, 21173106, 21401091]
- Foundation of State Key Laboratory of Coal Conversion [J16-17-913]
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Several new chiral oligomers of spiro-salenCo(III)X (spiro =1.1'-spirobiindane-7.7'-diol) complexes have been designed, synthesized, and characterized by nuclear magnetic resonance (NMR), infrared (IR), and elemental analyses, in which, the chiral spiro moieties are first introduced into a scaffold of chiral salenCo catalysts. They were used to catalyze the asymmetric cycloaddition of epoxides with carbon dioxide. Under very mild reaction conditions, a kinetic resolution of racemic epoxides with CO2 was smoothly initiated by these chiral oligomer catalysts with good enantioselectivities, which can be attributed to the match effect between chiral backbones of salen and spiro. High stability and easy recyclability are their major advantages. (C) 2016 Elsevier B.V. All rights reserved.
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