Zining Cui  Li Zhang  Juan Huang  Xinling Yang  Yun Ling 《中国化学》2010,28(7):1257-1266

42 novel diacylhydrazine derivatives containing furan were synthesized by the reaction of 5‐substituted phenyl‐2‐furoyl chloride with substituted benzohydrazide in anhydrous dichloromethane under reflux. Their structures were confirmed by IR, ¹H NMR, MS and elemental analysis. Insecticidal and antitumor activity of these new compounds was evaluated. The preliminary bioassays showed that the target compounds exhibited larvicidal activity to the Mythimna separate, some of them exhibited good or moderate larvicidal activity. At the concentration of 0.1%, compounds I2 , I4 , I5 , and III1 showed 95.0%, 90.0%, 95.0% and 95.0% larvicidal activity to Mythimna separate respectively. Some compounds such as I2 , I4 , I5 and III1 showed the typical IGRs' activity, which could induce the larvae premature, abnormal, and lethal larval molt. Results of anticancer activity indicated that some compounds exhibited potential activity against some human cancer cell lines, for example, I1 and IV showed good activity to the BGC‐823 and the inhibitory rates were 60.86% and 61.94% respectively at 10 µmol/L.  相似文献   

    

Kang‐Zhen Xu  Ji‐Rong Song  Feng‐Qi Zhao  Shu‐Yun Heng  Li Ding  Yao‐Yu Wang  Rong‐Zu Hu 《中国化学会会志》2009,56(3):524-531

A novel high energy material, 1‐amino‐1‐methylamino‐2,2‐dinitroethlyene (AMFOX‐7), was synthesized by the reaction of 1,1‐diamino‐2,2‐dinitroethylene (FOX‐7) and methylamine aqueous solution in N‐methyl pyrrolidone at 80°C. The thermal behavior and non‐isothermal decomposition kinetics of AMFOX‐7 were studied with DSC and TG/DTG methods. The kinetic equation of thermal decomposition reaction can be expressed as: $ {rm dalpha /d}T = frac{{10^{21.03}}}{{rm beta}}frac{3}{2}left({1 - {rm alpha}} right)left[{- 1{rm n}left({{rm 1} - {rm alpha}} right)} right]^{frac{1}{3}} exp left({- 2.292 times 10^5 {rm /}RT} right) A novel high energy material, 1‐amino‐1‐methylamino‐2,2‐dinitroethlyene (AMFOX‐7), was synthesized by the reaction of 1,1‐diamino‐2,2‐dinitroethylene (FOX‐7) and methylamine aqueous solution in N‐methyl pyrrolidone at 80°C. The thermal behavior and non‐isothermal decomposition kinetics of AMFOX‐7 were studied with DSC and TG/DTG methods. The kinetic equation of thermal decomposition reaction can be expressed as: $ {rm dalpha /d}T = frac{{10^{21.03}}}{{rm beta}}frac{3}{2}left({1 - {rm alpha}} right)left[{- 1{rm n}left({{rm 1} - {rm alpha}} right)} right]^{frac{1}{3}} exp left({- 2.292 times 10^5 {rm /}RT} right) $. The critical temperature of thermal explosion of AMFOX‐7 is 244.89°C. The specific heat capacity of AMFOX‐7 was determined with micro‐DSC method and theoretical calculation method, and the standard molar specific heat capacity is 199.39 J·mol^?1·K^?1 at 298.15 K. Adiabatic time‐to‐explosion of AMFOX‐7 was also calculated to be 215.41 s. AMFOX‐7 has higher thermal stability than FOX‐7.  相似文献   

    

Chein‐I Wu  Jiann‐Wen Huang  Ya‐Lan Wen  Shaw‐Bing Wen  Yun‐Hwei Shen  Mou‐Yung Yeh 《中国化学会会志》2009,56(6):1231-1235

Stable aqueous dispersions of silver (Ag) nanoparticles were prepared by reducing silver nitrate solutions with sodium borohydride (NaBH₄) in the presence of waterborne polyurethane as a stabilizing agent. WPU/Ag nanocomposites were obtained after evaporating water. Transmission electron microscope (TEM) shows nanoscale Ag particles are well dispersed in WPU matrix at a lower concentration, while particles exhibit a little aggregation at a higher concentration. UV‐visible spectra, X‐ray powder diffraction, and energy dispersive X‐ray spectrometer (EDS) confirm the existence of Ag particle in WPU matrix. The WPU/Ag composite films show good antibiotic ability.  相似文献   

    

Guo Hong  Matthew Zhou  Ruoxing Zhang  Prof. Dr. Shimin Hou  Dr. Wonmook Choi  Dr. Yun Sung Woo  Dr. Jae‐Young Choi  Prof. Dr. Zhongfan Liu  Prof. Dr. Jin Zhang 《Angewandte Chemie (International ed. in English)》2011,50(30):6674-6674

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Yue‐Hu Wang  Qian‐Yun Sun  Fu‐Mei Yang  Chun‐Lin Long  Fu‐Wei Zhao  Gui‐Hua Tang  Hong‐Mei Niu  Huan Wang  Qiao‐Qin Huang  Jin‐Jin Xu  Li‐Juan Ma 《Helvetica chimica acta》2010,93(12):2467-2477

Ten new phenolic compounds including the six neolignans 1 – 3 and 6 – 8 and four caffeoyl derivatives, i.e., myo‐inositol 1‐caffeate ( 9 ), myo‐inositol 6‐caffeate ( 10 ), myo‐inositol 5‐caffeate ( 11 ), and paucine 3′‐β‐D ‐glucopyranoside ( 12 ) were isolated from the whole plants of Selaginella moellendorffii (caffeic acid=3‐(3,4‐dihydroxyphenyl)prop‐2‐enoic acid). Their structures were established by spectroscopic and chemical methods.  相似文献   

    

Nai‐Yun Ji  Xiao‐Ming Li  Bin‐Gui Wang 《Helvetica chimica acta》2010,93(11):2281-2286

Two new halogenated sesquiterpenes, (8β)‐10‐bromo‐3‐chloro‐2,7‐epoxychamigr‐9‐en‐8‐ol ( 1 ) and 2‐bromo‐3‐chlorobisabola‐7(14),11‐diene‐6,10‐diol ( 3 ), and one new phytol‐derived diterpene, 2,3‐epoxyphytyl acetate ( 4 ), along with cis‐ and trans‐1‐methylcyclohexane‐1,4‐diol ( 5 and 6 ) which were isolated from a natural source for the first time but have been previously synthesized, were isolated from the marine red alga Laurencia composita and characterized. In addition, a known sesquiterpene, pacifenediol ( 2 ), and the known furanone derivative 7 were also identified. Their structures were established by NMR and mass spectroscopic methods.  相似文献   

    

Jiang Yongmei  Liu Yang  Ma Yun  Liu Xiaoli  Qin Zongyi  Zhu Meifang  H. J. Adler 《Macromolecular Symposia》2008,264(1):95-99

Novel interpenetrating networks (IPNs) hydrogels responsive to temperature were prepared in situ by liquid-phase photopolymerization. The first network of the IPNs (poly isopropyl acrylamide) were formed with a special kind of hectorite (Laponite XLS) modified by tetrasodium pyrophosphate as cross-linker and 2-oxogultaric acid as photoinitiator. The samples were subsequently immersed in an acrylamide (AAm) aqueous solution for at least one day for preparing IPNs hydrogels, in which acrylamide aqueous solution containing N,N′-Dimetyl acrylamide (MBAA) as cross-linker and 2-oxogultaric acid as photoinitiator. Then the second networks were in situ formed by introducing ultraviolet light irradiated PNIPAAm gels. The swelling/deswelling behaviors of IPNs hydrogels were measured. Compared with the corresponding nanocomposite PNIPAAm hydroges(NC hydrogels), chemically cross-linked PNIPAAm and PAAm IPNs hydrogels, the results indicate that the new IPN hydrogel has a faster deswelling rate above its LCST (≈32 °C). The effect was explained as being an additional contribution of the PAAm chains in IPN hydrogels, which may act as a water-releasing channel when the hydrophobic aggregation of PNIPA takes place.  相似文献   

    

Li‐Ping Wang  Yun‐Pu Wang  Kun Yuan  Zi‐Qiang Lei 《先进技术聚合物》2008,19(4):285-290

Polymer brushes were prepared by using the reversible addition fragmentation chain transfer (RAFT) technique. The silicon substrates (Si (111) surface) were modified with ethyl xanthate groups which were introduced by the treatment of Si (111) surface with sodium ethyl xanthate. The polymer brushes were then prepared under RAFT conditions from the Si (111) wafer. Its “living” characteristics were determined by a series of characterizations including gel permeation chromatography (GPC), ellipsometry, and contact angle measurements. The results showed a well‐defined graft layer consisting of polymer brushes with low‐polydispersity could be prepared directly on Si (111)‐X surface (where X represents an ethyl xanthate groups). The structure of the polymer brushes was characterized and confirmed with the surface sensitive techniques such as X‐ray photoelectron spectroscopy (XPS) and scanning probe microscopy (SPM). Copyright © 2007 John Wiley & Sons, Ltd.  相似文献   

    

Mugford PF  Wagner UG  Jiang Y  Faber K  Kazlauskas RJ 《Angewandte Chemie (International ed. in English)》2008,47(46):8782-8793

One often-cited weakness of biocatalysis is the lack of mirror-image enzymes for the formation of either enantiomer of a product in asymmetric synthesis. Enantiocomplementary enzymes exist as the solution to this problem in nature. These enzyme pairs, which catalyze the same reaction but favor opposite enantiomers, are not mirror-image molecules; however, they contain active sites that are functionally mirror images of one another. To create mirror-image active sites, nature can change the location of the binding site and/or the location of key catalytic groups. In this Minireview, X-ray crystal structures of enantiocomplementary enzymes are surveyed and classified into four groups according to how the mirror-image active sites are formed.  相似文献   

    

Yan Y  Martens AA  Besseling NA  de Wolf FA  de Keizer A  Drechsler M  Cohen Stuart MA 《Angewandte Chemie (International ed. in English)》2008,47(22):4192-4195

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