A number of salen-metal complexes were prepared and their enantioselective catalytic properties toward the asymmetric iodolactonization of （E）- and （Z）-5-substituted-4-pentenoic acid derivatives were investigated....A number of salen-metal complexes were prepared and their enantioselective catalytic properties toward the asymmetric iodolactonization of （E）- and （Z）-5-substituted-4-pentenoic acid derivatives were investigated. The catalyst system based on salen-Co（II） complex exhibited moderate to good enantioselectivity with the e.e. value ranging from 53% to 74%, as well as high regioselectivity of δ- vs. γ-iodolactones. The salen-Co（II） complex showed the highest enantioselectivity on the asymmetric iodolactonizations of （Z）-5-substituted-4-pentenoic acid derivatives among these reagent-controlled iodolactonization protocols known so far.展开更多
The reaction kinetics of hydrolysis resolution of racemic epichlorohydrin to chiral chloropropandiol and optically active epichlorohydrin, catalyzed by chiral salen metal complexes, was studied by using gas chromatogr...The reaction kinetics of hydrolysis resolution of racemic epichlorohydrin to chiral chloropropandiol and optically active epichlorohydrin, catalyzed by chiral salen metal complexes, was studied by using gas chromatography. The effects of temperature, catalyst type and catalyst concentration on the reaction rate were explored. On the experimental results, some kinetic regularity for the reaction has been obtained.展开更多
Schiff base was synthesized by using salicylaldehyde and ethylenediamine as raw materials,and then Co(Salen)complex was synthesized by using Schiff base and Co.The structure and purity of the samples were tested by ma...Schiff base was synthesized by using salicylaldehyde and ethylenediamine as raw materials,and then Co(Salen)complex was synthesized by using Schiff base and Co.The structure and purity of the samples were tested by mass spectrum.Then the orthogonal test method was used to study the catalytic performance of the complex in the reaction of benzil produced from benzoin,and the optimal reaction conditions were obtained finally.The results showed when the reaction temperature was 80℃,and the reaction time was 2h,the yield of benzil produced from benzoin by using Co(Salen)as catalyst reached the maximum 37.28%.展开更多
文摘A number of salen-metal complexes were prepared and their enantioselective catalytic properties toward the asymmetric iodolactonization of （E）- and （Z）-5-substituted-4-pentenoic acid derivatives were investigated. The catalyst system based on salen-Co（II） complex exhibited moderate to good enantioselectivity with the e.e. value ranging from 53% to 74%, as well as high regioselectivity of δ- vs. γ-iodolactones. The salen-Co（II） complex showed the highest enantioselectivity on the asymmetric iodolactonizations of （Z）-5-substituted-4-pentenoic acid derivatives among these reagent-controlled iodolactonization protocols known so far.
文摘The reaction kinetics of hydrolysis resolution of racemic epichlorohydrin to chiral chloropropandiol and optically active epichlorohydrin, catalyzed by chiral salen metal complexes, was studied by using gas chromatography. The effects of temperature, catalyst type and catalyst concentration on the reaction rate were explored. On the experimental results, some kinetic regularity for the reaction has been obtained.
文摘Schiff base was synthesized by using salicylaldehyde and ethylenediamine as raw materials,and then Co(Salen)complex was synthesized by using Schiff base and Co.The structure and purity of the samples were tested by mass spectrum.Then the orthogonal test method was used to study the catalytic performance of the complex in the reaction of benzil produced from benzoin,and the optimal reaction conditions were obtained finally.The results showed when the reaction temperature was 80℃,and the reaction time was 2h,the yield of benzil produced from benzoin by using Co(Salen)as catalyst reached the maximum 37.28%.
