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Novel Phosphonoacetic Acid *** of N-(Ethoxycarbonylmethylphosphonyl)-α-Amino Esters and-α-Amino Phosphonic Acid Esters and Their Bioactivities

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Chinese Chemical Letters 1997年第12期8卷 0-0,0-0页

作者： Hui Ying LI Kang Tai REN Ru Yu CHEN(institute of Elemento-Organic Chemistry, nankai university, tianjin 300071) Inst. of Elemento-Organic Chemistry Nankai University Tianjin 300071 China

A series of novel phosphonoacetic acid derivatives, N-(ethoxycarbonylmethy-ethoxyphosphonyl)-α-amino acid esters and α-amino phosphonates, were synthesized via the reaction of the corresponding phosphonyl chloride with amino acid ester hydrochlorides or amino phosphonates in the presence of a base. The preliminary bioassay shows that some compounds show significant anti-viral activity against tobacco mosaic virus (TMV)

关键词： Novel Phosphonoacetic Acid Derivatives.Synthesis of N cm PN Amino Phosphonic Acid Esters and Their Bioactivities Ethoxycarbonylmethylphosphonyl Amino Esters and

REINFORCEMENT OF CALCIUM PHOSPHATE CEMENTS WITH PHOSPHORYLATED CHITIN

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Chinese Journal of Polymer Science 2002年第4期20卷 325-332页

作者： Xiao-hong Wang Jian-biao Ma Yi-nong Wang Bin-ling He The State Key Laboratory of Functional Polymer Materials for Adsorption and Separation institute of Polymer Chemistry nankai university tianjin 300071, china institute of Polymer Chemistry Nankai University The State Key Laboratory of Functional Polymer Materials for Adsorption and Separation 天津 300071

Phosphorylated chitins (P-chitins) as the additives of calcium phosphate cements (CPCs) were prepared by the phosphorylation of chitin with phosphorus pentoxide in methanesulfonic acid. Their physical properties and effects on CPCs from monocalcium phosphate monohydrate (MCPM) and calcium oxide (CaO) or dicalcium phosphate dihydrate (DCPD) and calcium hydroxide [Ca(OH)(2)] were investigated. Addition of P-chitin (M-w = 2.60 x 10(4); degree of substitution, DS = 0.68) to the liquid phase in amounts up to 3 wt.% for MCPM and CaO cements or 1.5 wt.% for DCPD and Ca(OH)(2) cements could enhance the mechanical strength considerably, while little influence on the setting time was observed. However, further addition of P-chitin will cause no setting.

关键词： phosphorylated chitins calcium phosphate cements mechanical strength setting time

Syntheses　and　Herbicidal　Activity　of　New　Pyrimidinyl（triazinyl）oxy　Substituted　Carboxylic　Derivatives

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Chemical Research in Chinese Universities 1996年第4期12卷 360-367页

作者： LI Zheng-ming LIAO Yun WANG Ling-xiu and YANG Zhao(Research institute of Elemento-organic Chemistry,nankai university,tianjin,300071) nankai UNIV RES INST ELEMENTOORGAN CHEMTIANJIN 300071PEOPLES R CHINA

New compounds were synthesized,which belong to 3 types of pyrimidinyl(triazinyl)oxy substituted carboxylic derivatives *** bioassay,the effects of the structural factors on the herbicidal activity were investigated,in... 详细信息

关键词： s:Pyrimidinyl(triazinyl)oxy substituted carboxylic derivative Synthesis Herbicidal activity

Crystal Structure of N-Phenylisothiocyanatido-Phosphonamidothioate

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Chinese Journal of Structural Chemistry 1997年第3期16卷 200-202页

作者： HE Liang-Nian CHEN Ru-Yu(institute of Elemento-Organic Chemistry, nankai university, tianjin 300071)WANG Hong-Gen YAO Xin-Kan(Central Laboratory, nankai university, tianjin 300071) Inst. of Elemento-Organic Chemistry Nankai University Tianjin 300071 China Central Laboratory Nankai University Tianjin 300071 China

The crystal structure of the title compound, C14H13N2OPS2, has beendetermined by single crystal X-ray diffraction at 299(±1 )K. The crystal is monoclinicwith space group P21/n, a= 11. 310(2), b=8. 363(3), c= 16. 847(4) A, β= 105. 01(2)°, V= 1539(1) A3, Z=4, Dx= 1. 38g/cm3, μ(M0Ka) = 0. 43mm-1, Mr= 320. 7,F(000) = 644. The final R factor is 0. 051, and R. is 0.052. The result of X-raydiffraction analysis indicates that the atoms P.S(2) 1 N (2).C(11) and N (1) constitutea distorted tetrahedron with sp3 hybridized phosphorus atom in the center.

关键词： isothiocyanatidophosphonamidothioate crystal structure Lawesson's reagent

Insight into herbicide resistance of W574L mutant Arabidopsis thaliana acetohydroxyacid synthase:molecular dynamics simulations and binding free energy calculations

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Science china Chemistry 2010年第1期53卷 91-102页

作者： YU ZhiHong,WEN Xin & XI Zhen State Key Laboratory of Elemento-Organic Chemistry Department of Chemical Biology,nankai university,tianjin 300071,china State Key Laboratory of Elemento-Organic Chemistry Department of Chemical Biology Nankai University Tianjin China

Acetohydroxyacid synthase(AHAS) is the target enzyme of several classes of herbicides,such as sulfonylureas and *** many mutant AHASs with herbicide resistance have emerged along with extensive use of herbicides,therefore it is imperative to understand the detailed interaction mechanism and resistance mechanism so as to develop new potent inhibitors for wild-type or resistant *** the aid of available crystal structures of the Arabidopsis thaliana(At) AHAS-inhibitor complex,molecular dynamics(MD) simulations were used to investigate the interaction and resistance mechanism directly and dynamically at the atomic ***-level MD simulations were performed on six systems consisting of wild-type or W574L mutant AtAHAS in the complex with three sulfonylurea inhibitors,separately,and binding free energy was calculated for each system using the MM-GBSA *** analyses from structural and energetic aspects confirmed the importance of residue W574,and also indicated that W574L mutation might alert the structural charactersistic of the substrate access channel and decrease the binding affinity of inhibitors,which cooperatively weaken the effective channel-blocked effect and finally result in weaker inhibitory effect of inhibitor and corresponding herbicide resistance of W574L *** our knowledge,it is the first report about MD simulations study on the AHAS-related system,which will pave the way to study the interactions between herbicides and wild-type or mutant AHAS dynamically,and decipher the resistance mechanism at the atomic level for better designing new potent anti-resistance herbicides.

关键词： sulfonylurea herbicides,acetohydroxyacid synthase,W574L mutant,herbicide resistance,molecular dynamics simulations,binding free energy calculation MM-GBSA

Allyltin tribromide: A versatile reagent involved in the ring-opening of epoxides

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中国科学：化学英文版 2010年第6期53卷 1294-1301页

作者： CHEN GuoHong,WANG Xin,JIN XiaoQian,LIU LingYan,CHANG WeiXing & LI Jing State Key Laboratory and Research institute of Elemento-organic Chemistry,nankai university,tianjin 300071,china State Key Laboratory and Research institute of Elemento-organic Chemistry Nankai University Tianjin China

This paper presents a versatile reagent for epoxide *** allyltin tribromide could act as a novel and easily prepared allylation reagent and halide atom donor to convert epoxides to the corresponding homoallyl alcohols and halohydrins in high yields with excellent regioselectivities under mild reaction conditions,*** could also act as a Lewis acid to catalyze the ring opening reactions of epoxides with alcohols.

关键词： versatile reagent allyltin tribromide ring opening of epoxides room temperature

Synthesis and Moessbauer Spectra of Four-Coordinated Tin Compounds Containing Tin-Copper Bonds

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Chinese Chemical Letters 1998年第5期9卷 491-494页

作者： Jin Shan LI and (institute of Elemento-Organic Chemistry, nankai university, Tianin 300071)Jing Kun ZANG (Central Laboratory, nankai university, Tanjin 300071) Inst. of Elemento-Organic Chemistry Nankai University Tianjin 300071 China Central Laboratory Nankai University Tianjin 300071 China

Seven compounds containing tin-copper bonds, namely [Ph2P(CH2)(n)PPh2](CuSnPh3)(2) (n=1-4) and (Ph2PR)CuSnPh3 (R=Ph, Bu, Am), have been synthesized. Tin-119 Moessbauer spectra for these compounds were determined. The results have shown that the QS values for these compounds are all zero, the IS values are between 1.32 and 1.38 mm/s, and the oxidation state of tin is +4.

关键词： Moessbauer spectrum oxidation state electron density

A NEW METHOD FOR PBEPARATION OF IBON(Ⅲ) PORPHYRIN OXYANION OMPLEXES -SYNTHESIS OF PERCHLORATE(PORPHYINATO) IRON(Ⅲ)

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Chinese Chemical Letters 1996年第2期7卷 187-188页

作者： Xin Hua ZHONG Yao Yu FENG Jie Sheng HUANG and Pan Wen SHEN(Departemt ot Chemistry. nankai university, tianjin 300071)(institute of Chemical Engineering,tianjin university, tianjin 300072) Department of Chemistry Nankai University Tianjin 300071 institute of Chemical Engineering Tianjin University Tianjin 300072

A new method for preparetion of iron(III) porphyrin oxyanion complexes was reported. By this method perchiorate complex of iron(III) tetraphenylporphyrin [FeTPP(OClO3)] was prepared from i-butylamine complex of iron(I...

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Study of D^0-D^0 mixing at a giga-Z linear collider

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Science china(Physics,Mechanics & Astronomy) 2010年第11期53卷 1953-1956页

作者： LI HaiBo 1 & YANG MaoZhi 2 1 institute of High Energy Physics,P.O.Box 918,Beijing 100049,china 2 School of Physics,nankai university,tianjin 300071,china institute of High Energy Physics Beijing China School of Physics Nankai University Tianjin China

The possibility of studying D 0-D 0 mixing at a giga-Z linear collider "Z factory" where 10 9 hadronic Z 0 decays can be accumulated is *** discuss the sensitivity for the measurements of neutral D mixing *** results are compared to those attainable at B *** find that the typical decay length of the neutral D mesons at Z factory is about 10 times larger than that at B *** addition,the resolution of the vertex detector of a giga-Z factory is 2-3 times better than that of B *** proper time resolution at Z factory is about 20-30 times better than that at B *** the determination of the mixing parameters at a giga-Z factory is more precise.

关键词： Z factory D0 mesons mixing B factory