N,N′-ethidenedi(2-hydroxy 4 methoxy benzophenone imine acetal)was synthesized and characterized by the melting point,elemental analysis,UV,IR,MS and 1H NMR.The result of XRD proved that it belonged to the monoclinic ...N,N′-ethidenedi(2-hydroxy 4 methoxy benzophenone imine acetal)was synthesized and characterized by the melting point,elemental analysis,UV,IR,MS and 1H NMR.The result of XRD proved that it belonged to the monoclinic system.Its lattice parameters were:a=1.1018nm,b=1.5730nm,c=1.8858nm,β=93.50°.The schiff base has a strong absorption ability to absorb the UV-A and UV-B,and bears antibacterial activity of many bacterial.展开更多
The reaction of anhydrous YbCl3 with lithium b-diketiminate, LLi (L = N,N- diphenyl-2,4-pentanediimine anion), in 1:1 molar ratio in THF gave rise to the title complex LYbCl2(THF)2 1 which has been characterized by si...The reaction of anhydrous YbCl3 with lithium b-diketiminate, LLi (L = N,N- diphenyl-2,4-pentanediimine anion), in 1:1 molar ratio in THF gave rise to the title complex LYbCl2(THF)2 1 which has been characterized by single-crystal X-ray diffraction. It crystallizes in the orthorhombic system, space group Pna21(#33) with a = 19.657(8), b = 9.581(4), c = 14.107(6) ? V = 2656.8(18) 3, Z = 4, C25H33N2O2Cl2Yb, Mr = 637.49, Dc = 1.594 g/cm3, F(000) = 1268.00 and m(MoKa) = 3.744mm-1. The final R and wR are 0.031 and 0.073 for 2596 observed reflections with I > 2s(I), respectively. The X-ray crystal structure analysis revealed that the center ytterbium(III) is bonded to two chloride anions, two oxygen atoms from two tetrahydrofuran molecules and one chelate ligand b-diketiminate to form a six-coordinate distorted octahedral geometry.展开更多
This paper designed and synthesized a series of different chain length of phthalonitrile-terminated oligo （phthalazinone imide）, it has good water solubility, and can be under normal atmospheric pressure to form the...This paper designed and synthesized a series of different chain length of phthalonitrile-terminated oligo （phthalazinone imide）, it has good water solubility, and can be under normal atmospheric pressure to form the s-triazine rings-containing thermosetting oligo （phthalazine imide）. Compared with the traditional thermosetting resin, the resin has the advantages of high temperature resistance, high strength, flame retardant, resistance to chemical corrosion.展开更多
The selectivities, including peri-, regio-, and diastereoselectivities, in the Staudinger reaction involving vicinal diimines and ketenes were investigated theoretically via the density functional theory （DFT） calcu...The selectivities, including peri-, regio-, and diastereoselectivities, in the Staudinger reaction involving vicinal diimines and ketenes were investigated theoretically via the density functional theory （DFT） calculation. The results indicate that vicinal diimines prefer stepwise [2＋2] cycloaddition rather than [2＋4] cycloaddition to generate cis-4-imino-β-lactams. The diimines attack the less sterically hindered exo-side of ketenes to generate zwitterionic intermediates, which directly undergo a conrota- tory ring closure to produce cis-4-imino-β-lactams whatever diimines with less or more bulky N-substituents. For unsymmetric vicinal ketoaldehyde-derived diimines, their ketimines attack the exo-side of ketenes and undergo a conrotatory ring closure to produce cis-4-aldimino-β-lactams due to less steric effect. The current theoretical studies provide very important information for in-depth understanding of the selective formation of mono-cis-β-lactams from vicinal diimines and ketenes.展开更多
文摘N,N′-ethidenedi(2-hydroxy 4 methoxy benzophenone imine acetal)was synthesized and characterized by the melting point,elemental analysis,UV,IR,MS and 1H NMR.The result of XRD proved that it belonged to the monoclinic system.Its lattice parameters were:a=1.1018nm,b=1.5730nm,c=1.8858nm,β=93.50°.The schiff base has a strong absorption ability to absorb the UV-A and UV-B,and bears antibacterial activity of many bacterial.
基金Supported by the National Natural Science Foundation of China (20072027) Department of Education of Jiangsu province and the Key Laboratory of Organic Synthesis of Jiangsu province
文摘The reaction of anhydrous YbCl3 with lithium b-diketiminate, LLi (L = N,N- diphenyl-2,4-pentanediimine anion), in 1:1 molar ratio in THF gave rise to the title complex LYbCl2(THF)2 1 which has been characterized by single-crystal X-ray diffraction. It crystallizes in the orthorhombic system, space group Pna21(#33) with a = 19.657(8), b = 9.581(4), c = 14.107(6) ? V = 2656.8(18) 3, Z = 4, C25H33N2O2Cl2Yb, Mr = 637.49, Dc = 1.594 g/cm3, F(000) = 1268.00 and m(MoKa) = 3.744mm-1. The final R and wR are 0.031 and 0.073 for 2596 observed reflections with I > 2s(I), respectively. The X-ray crystal structure analysis revealed that the center ytterbium(III) is bonded to two chloride anions, two oxygen atoms from two tetrahydrofuran molecules and one chelate ligand b-diketiminate to form a six-coordinate distorted octahedral geometry.
文摘This paper designed and synthesized a series of different chain length of phthalonitrile-terminated oligo （phthalazinone imide）, it has good water solubility, and can be under normal atmospheric pressure to form the s-triazine rings-containing thermosetting oligo （phthalazine imide）. Compared with the traditional thermosetting resin, the resin has the advantages of high temperature resistance, high strength, flame retardant, resistance to chemical corrosion.
文摘The selectivities, including peri-, regio-, and diastereoselectivities, in the Staudinger reaction involving vicinal diimines and ketenes were investigated theoretically via the density functional theory （DFT） calculation. The results indicate that vicinal diimines prefer stepwise [2＋2] cycloaddition rather than [2＋4] cycloaddition to generate cis-4-imino-β-lactams. The diimines attack the less sterically hindered exo-side of ketenes to generate zwitterionic intermediates, which directly undergo a conrota- tory ring closure to produce cis-4-imino-β-lactams whatever diimines with less or more bulky N-substituents. For unsymmetric vicinal ketoaldehyde-derived diimines, their ketimines attack the exo-side of ketenes and undergo a conrotatory ring closure to produce cis-4-aldimino-β-lactams due to less steric effect. The current theoretical studies provide very important information for in-depth understanding of the selective formation of mono-cis-β-lactams from vicinal diimines and ketenes.
