科研之友
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摘要
Asymmetric electrochemical carboxylation is the direct and effective method to fix and utilize CO2, and the selection of chiral catalysts is crucial. In this paper, a series of chiral metal salen complexes are prepared as chiral catalysts to achieve enantioselective conversion of acetophenone with CO2 to synthesis chiral 2-hydroxy-2-phenylpropionic acid under electrochemical conditions. Under the catalysis of Ni(II)L1, the enantiomeric excess (ee) value of 90 % and yield of 59 % are obtained. By cyclic voltammetry and potentiostatic electrolysis, the effects of metal centers and tert-butyl groups in ligand structures on the catalytic results are studied and the possible reaction mechanism is proposed.
