substitu相关论文
A highly efficient conformation from facile benzoylhydrazines was developed under electrochemical condition.A variety of......
Asymmetric hydrogenation of α-keto Weinreb amides has been realized with [Ru((S)-Sunphos)(benzene)Cl]Cl as the catalyst......
As one of the seaweed polysaccharide, agarose has received much attention because of its biocompatibility. However, its ......
Two novel and well-defined polyhedral oligomeric silsesquioxanes(POSS) with two same Si_8O_(12) cores and a reactive NH ......
Facile one-pot clean synthesis of benzimidazole motifs: Exploration on bismuth nitrate accelerated s
In the present letter, an efficient, clean and one-pot synthesis of 2-substituted benzimidazole and 1,2-disubstituted be......
(6-Amino-2-chloro-3-fluorophenyl)methanol is prepared through both traditional methods and palladium catalyzed iterative......
Efficient Syntheses of Permethylated Derivatives of Neolamellarin A,a Pyrrolic Marine Natural Produc
The pyrrole-derived alkaloids with marine origin, especially their permethyl derivatives, have unique structures and pro......
The MS fragmentation behaviors of semicarbazone and thiosemicarbazonewith different polar substituents R (R=N(CH_3)_2,O......
A modified spectrophotometric method for coordination nucleo-philic substitution reactions between two kinds of ligands......
Separation of Nine Metal Tetrekis (M-Bromic)phenylporphyrin Complexes by High-performance Liquid Chr
A series of compounds of meso-tetraphenylporphyrin (TPP) derivatives of fluorine, chlorine and bromine was synthesized.......
INTRODUCTION. The complexes of rare-earth metal with sulphoxides are a class of compounds that possess properties of ex......
The soluble poly-o-toluidine （POT） and poly-m-toluidine （PMT） have been success-fully prepared under controlled conditions o......
The peroxotitanium-substituted heteropolytungstate (-K7GaW11(TiO2)O39(11H2O has been synthesized and characterized by el......
The chemical composition and mineral structure of fluorgypsurn as well as its harm to application in cement were elabora......
We have prepared the Ho-substituted bismuth titanate (Bi3.4Ho0.6Ti3O12, BHT) thin films on Pt/Ti/SiO2/Si substrates usin......
Heterolytic and homolytic bond dissociation energies of the N-H bonds in Ylide precursors and proper
It is well known that the reaction pattern and reactivity of Ylides are related to thestabilities of the corresponding ......
Two new bromophenols were isolated from Rhodomela confervoides. Their structrues were elucidated as 2, 2’, 3-tribromo-......
The synthesis and mesomorphic properties of two series of novel -substituted -diketonates have been reported. All of the......
Synthesis of New Naphthaline-type Chromophores with Strong Green-emitting or the Blue-emitting in β-
Three new naphthaline-type chromophores end-capped with different (p-substituted amino) styryl groups on the both sides ......
(31)~P NMR and ESI-MS Studies on Some Intermediates of the Peptide Coupling Reagents Triphenyl-chlor
The intermediates of the Appel coupling reagents were studied in acetonitrile, dimethoxyethane and dioxane by P NMR, C N......
A New Process for Synthesis of Dimethyl Carbonate from Ethylene Carbonate and Methanol without any C
Dimethyl carbonate was synthesized by transesterification reaction between ethylene carbonate and methanol under supercr......
The first total synthesis of natural 6β-cinnamoyloxy-1α-hydroxy-5, 10-bis-epi- eudesm-4-en-3-one (1), a highly complex......
The reaction of p- and/ α-subtituted benzyl alcohols in CaY-zeolite produced the corresponding dibenzyl ethers and/or b......
Synthesis of methyl N-phenyl carbamate from dimethyl carbonate and 1,3-diphenyl urea under mild cond
Synthesis of methyl N-phenyl carbamate from dimethyl carbonate and 1,3-diphenyl urea was investigated under atmospheric ......
The equilibrium structures and electronic structure of LaNi_(5-x)Ga_x(x=0,0.5,1.0) compounds have been investigated by a......
A new class of metal phthalocyanines(MPcs) containing four 8-quinolinol(8-QH) derivative moieties were successfully synt......
The synthesis and molecular recognization of the polyamine transporter of hydrazine-modified diamine
A series of four novel hydrazine-modified diamine conjugates(7a-b,8a-b)were synthesized and evaluated for cytotoxicity a......
Synthesis,thermal property and hydrolytic degradation of a novel star-shaped hexa[p-(carbonylglycino
A novel star-shaped cyclotriphosphazene substituted by glycinomethylesterphenoxy and its intermediates are synthesized f......
Synthesis and Antiproliferative Activity of Novel [1,2,4]Triazolo[1,5-a]pyrimidine-7-amine Derivativ
A series of novel N-anilino-2-substituted-5-methyl-[1,2,4]triazolo[1,5-a]pyrimidine-7-amine derivatives was prepared and......
Chloroamidinium salts and α-amino alcohols derived from commercially available tetraalkyl ureas and α-amino acids, res......
Mgx Zn1–x O thin films with x = 0, 0.11, 0.28, 0.44, 0.51, and 0.65 were grown by plasma-assisted molecular beam epitax......
A series of pre-reduced LaMn1-xCuxO3 (0≤x...
Detection of QTL for Cold Tolerance at Bud Bursting Stage Using Chromosome Segment Substitution Line
该文从挂篮荷载计算、施工流程、支座及临时固结施工、挂篮安装及试验、合拢段施工、模板制作安装、钢筋安装、混凝土的浇筑及养生......
Hafnium (IV) bis(perfluorooctanesulfonyl)imide complex catalyzed direct amidomethylation for the syn
为探究吕家坨井田地质构造格局,根据钻孔勘探资料,采用分形理论和趋势面分析方法,研究了井田7......
Detection of QTL for Cold Tolerance at Bud Bursting Stage Using Chromosome Segment Substitution Line
The cold tolerance at the bud bursting stage (CTB) was evaluated at 5℃ by using a set of 95 chromosome segment substitu......
用溶胶-凝胶法制备BiFe1-xCoxO3样品,用X射线衍射仪、扫描电镜、能谱分析对样品的结构、微观形貌、元素组成进行了表征,用微波矢量......
用生物素（Biotin-6-dUTP)标记的大麦Betzes基因组DNA作探针，以普通小麦中国春总DNA作封阻进行基因组原位杂交（Genomeinsituhybridizat......
基于第一性原理,采用平面波赝势方法,计算并分析了CdSxSe1-x的晶体结构和电子结构及不同含量的S含量对CdSxSe1-x合金体系性质的影......
Hafnium (IV) bis(perfluorooctanesulfonyl)imide complex catalyzed direct amidomethylation for the syn
Hafnium (IV) bis(perfluorooctanesulfonyl)imide complex is found to be an efficient catalyst for the multicomponent conde......
在畜禽养殖规模化的大背景下,机械化成为蛋鸡产业提质增效、转型升级的关键,研究蛋鸡养殖机械化对劳动力的替代关系对于产业规模化......
采用液相非稳态共沉淀法制备了镁铝类水滑石（Mg-Al HTlc），并研究了邻、间和对甲基苯酚在Mg-A1HTlcL的吸附行为。结果表明，邻、间和对甲......
本文通过对反应时间、温度及乙酸钠的用量,制备出不同取代度的羧甲基魔芋葡甘聚糖,选取最接近取代度0.1、0.2、0.3、0.4、0.5的样......
采用水相法制备辛烯基琥珀酸甘薯淀粉酯，详细研究了淀粉乳质量分数、辛烯基琥珀酸酐用量、温度、pH、反应时间等因素对产品取代度的......
簇合物ＮＥｔ４ＲｕＣｏ３（ＣＯ）１２［１］分别与配体三苯基膦和二苯基膦反应，得到双取代产物ＮＥｔ４Ｃｏ３（ＣＯ）１０（ＰＰｈ３）２《３》和ＮＥｔ４Ｃｏ３（ＣＯ）１０（ＰＰｈ２Ｈ）２［５］。双取代产物进一步质子化，则得到具有相应结构的中性簇合物ＨＲｕＣｏ（ＣＯ）１０（ＰＰｈ３）２［４Ａ］和ＨＲｕＣｏ（ＣＯ）１０（ＰＰｈ２Ｈ）２。它们......
为了充分了解型钢再生混凝土梁的破坏特征,对4组型钢再生混凝土梁进行抗弯静载试验,了解型钢再生混凝土梁从开始加载直至破坏各个......
结合工作实践,针对几种液压支架控制系统普遍存在的问题,提出了改进建议。...
目的探讨脑脊液负流量置换联合鞘内注药治疗结核性脑膜炎的临床疗效。方法80例结脑患者随机分为治疗组和对照组，所有患者均采用3HRZ......
为了提高La-Mg-Ni系贮氢合金的循环稳定性，以Al部分替代Ni，采铸造及快淬工艺制备了La0．7Mg0．3Ni2．55-xCo0．45Alx（x=0，0．1，0．2，0．3，0．4）电极合金，研究......
基于元素的Allen电负性，原子成σ键的电子数，原子直接键连的氢原子数目和原子形成离域键时所提供的Pz电子数，建立了一种分子拓扑指数（^......
本报导了两种新化合物(3,7一二氯-8-喹啉甲醇-2,3,5—三碘苯甲酸酯及3.7一二氯-8-喹啉甲醇-3.5—二硝基苯甲酸酯)的合成,并对它们......
