Owing to its two unsymmetrical-NH2 groups sited on different terminals, 2, 6-diaminocaproic acid (lysine) was used as a reactant for synthesizing a novel unsymmetrical Schiff base with salicylaldehyde on one side and ...Owing to its two unsymmetrical-NH2 groups sited on different terminals, 2, 6-diaminocaproic acid (lysine) was used as a reactant for synthesizing a novel unsymmetrical Schiff base with salicylaldehyde on one side and ovanillin on the other for the first time. It is a new way to synthesize such a special unsymmetrical Schiff base. It is named “hetero bis-Schiff base” for distinguishing it from others. The synthesis method, formation mechanism as well as twelve new lanthaniHe complexes with the above ligand are reported and discussed herein. They were characterized by elementary analysis, molar conductivity, IR-spectra and especially by1H and13C NMR spectra. The results obtained may provide a new promising method for synthesizing similar unsymmetrical Schiff bases and their complexes.展开更多
Chiral sulfonamides derived from(d)-10-camphorsulfonyl chloride and chiral amines were prepared and used in the copper-catalyzed conjugate addition of organometallic reagents to enones.The chiral sulfonamides/CuCN cat...Chiral sulfonamides derived from(d)-10-camphorsulfonyl chloride and chiral amines were prepared and used in the copper-catalyzed conjugate addition of organometallic reagents to enones.The chiral sulfonamides/CuCN catalysts provided high catalytic activity and moderate enantioselectivity in the conjugate addition of diethylzinc to 2-cyclohexenone and 2-cyclohepteneone,but low enantioselectivity to the 2-cyclopentenone and acyclic enones.展开更多
A novel Schiff base (TAMET) was synthesized by the condensation of tetraglycol aldehyde with methionine and a mild oxidant CrO3. (C5H5N)2 was selected for the reaction. Seven new rare earth complexes with this Schiff ...A novel Schiff base (TAMET) was synthesized by the condensation of tetraglycol aldehyde with methionine and a mild oxidant CrO3. (C5H5N)2 was selected for the reaction. Seven new rare earth complexes with this Schiff base have been synthesized and characterized by elemental analysis, TG-DTA, molar Conductivity, magnetic susceptibility and IR, especially 1H NMR spectra. Information was obtained from reflectance spectra and the coordination of sulfur atom to rare earths was discussed. The experimental results show that these compounds have some biological activity and could dispose of O2?-.展开更多
基金Project supported by the National Natural Science Foundation of China (Grant No. 29671026)the Natural Science Foundation of Zhejiang Province (Grant No. 296062)the Laboratory of MRAMP (Grant No. 971502)
文摘Owing to its two unsymmetrical-NH2 groups sited on different terminals, 2, 6-diaminocaproic acid (lysine) was used as a reactant for synthesizing a novel unsymmetrical Schiff base with salicylaldehyde on one side and ovanillin on the other for the first time. It is a new way to synthesize such a special unsymmetrical Schiff base. It is named “hetero bis-Schiff base” for distinguishing it from others. The synthesis method, formation mechanism as well as twelve new lanthaniHe complexes with the above ligand are reported and discussed herein. They were characterized by elementary analysis, molar conductivity, IR-spectra and especially by1H and13C NMR spectra. The results obtained may provide a new promising method for synthesizing similar unsymmetrical Schiff bases and their complexes.
文摘Chiral sulfonamides derived from(d)-10-camphorsulfonyl chloride and chiral amines were prepared and used in the copper-catalyzed conjugate addition of organometallic reagents to enones.The chiral sulfonamides/CuCN catalysts provided high catalytic activity and moderate enantioselectivity in the conjugate addition of diethylzinc to 2-cyclohexenone and 2-cyclohepteneone,but low enantioselectivity to the 2-cyclopentenone and acyclic enones.
基金Project supported by the National Natural Science Foundation of China (No. 29671026)the Natural Science Foundation of Zhejiang Province (No. 296062)the State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics (No. 971502)
文摘A novel Schiff base (TAMET) was synthesized by the condensation of tetraglycol aldehyde with methionine and a mild oxidant CrO3. (C5H5N)2 was selected for the reaction. Seven new rare earth complexes with this Schiff base have been synthesized and characterized by elemental analysis, TG-DTA, molar Conductivity, magnetic susceptibility and IR, especially 1H NMR spectra. Information was obtained from reflectance spectra and the coordination of sulfur atom to rare earths was discussed. The experimental results show that these compounds have some biological activity and could dispose of O2?-.
