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chemical constitution     
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  化学结构
     The effects of reaction medium,reaction time and amounts of acid acceptor pyridine on the yield of the product CDESA were studied and its chemical constitution was proved by elementary analysis,ester value,hydroxyl value and IR spectrum. Thus,the reaction was conducted with n(CMESA)∶n(stearyl chloride)∶n(pyridine)=1∶1∶1 in 1,4-dioxan under reflux for 3 h to give CDESA in 93.1% yield.
     研究了反应介质、反应时间和缚酸剂吡啶的用量对生成物CDESA收率的影响,通过元素分析、官能团分析和红外光谱确证其化学结构,最佳合成条件为:n(CMESA)∶n(硬脂酰氯)∶n(吡啶)=1∶1∶1,1,4-二氧六环为反应介质,回流加热反应3h,CDESA收率为93.1%。
短句来源
     Nicolaus et al suggested melanins that can be classified into three clusters according to the chemical constitution: eumelanins、phaeomelanins and allomelanins.
     Nicolaus等人提出,按其化学结构差异,可将其分成三类:真黑素(eumelanins)、棕黑素(phaeomelanins)和异黑素(allomelanins)。
短句来源
     different maceral have different chemical constitution. Exinite has the lightest carbon isotopic composition. Inertinite with the heaviest carbon isotopic composition has highest aromatization degree.
     指出不同显微组分具有不同的化学结构组成,壳质组具有最轻的碳同位素组成,芳构化程度最高的惰质组具有最重的碳同位素组成,因此产物甲烷的碳同位素组成具有半丝质组>丝质组>镜质组>壳质组的规律。
短句来源
     Utilize the infrared analysis instrument to measure the spectrum to absorb the situation, has analyzed the micro chemical constitution of SiC/PI resin base composite;
     利用红外分析仪测量了光谱吸收情况,分析了SiC/PI树脂基复合材料的微观化学结构
短句来源
     A Study on the Change of Chemical Constitution of Acrylonitrile/Diacetone Acrylamide/Methyl Acrylate Copolymers during Thermal Stabilization by In-situ Infrared Spectroscopic Method
     原位红外光谱法研究丙烯腈/二丙酮丙烯酰胺/丙烯酸甲酯共聚物热稳定化期间化学结构的变化
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  化学成分
     OPTIMIZING CHEMICAL CONSTITUTION AND ITS PRODUCTION OF AWSER70S-6 WELDING-WIRE STEEL
     AWSER70S-6焊丝钢的化学成分优化及生产实践
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     Results of the study show that chemical constitution in sediment from the coastal zone of Liaoning Province exists mainly as RCO3, Fe2O3, MgO, CaO, MnO, Corg and Nt.
     研究结果表明,辽宁省海岸带沉积物中的化学成分主要是以RCO_3、Fe_2O_3、MgO、CaO、MnO、C_(ong)和N_t的形式存在。
短句来源
     The basic glass batches were designed mainly by the chemical constitution of the steel slag, then different points were selected in CaO— Al_2O_3 — SiO_2 phase diagram.
     基础玻璃配方的制定主要是根据钢渣的化学成分,在CaO—Al_2O_3—SiO_2系统相图辉石初晶区中选择不同的成分点制定不同的配方。 在基础玻璃配方中引入晶核剂,通过正交试验拟定微晶玻璃配方。
短句来源
     Introduce the chemical constitution, properties and the producing technology of 30Cr2Ni4MoV steel used for bit shank The resultsshow that the service life of the bit shank made from the steel 30Cr2Ni4MoV is more longer
     介绍了钎尾用钢 30 Cr2 Ni4Mo V的化学成分、生产制造工艺及性能。 结果表明 ,该钢用作钎尾 ,其使用寿命明显提高。
短句来源
     It is found that major chemical constitution of fly ash is CaO,SiO_2 and Al_2O_3,featuring an SiO_2-Al_2O_3-metal oxides system,which can be used as the raw material of glazed tile.
     结果表明:飞灰主要化学成分是CaO、SiO2、Al2O3,构成SiO2-Al22O3-金属氧化物体系,可用作饰面砖的原材料;
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  化学组成
     The structure and the thermal properties of ultra-high molecular weight polyacrylonitrile (UHMW-PAN) prepared by suspension polymerization were measured by FTIR, viscosity method, GPC, 13 C-NMR, X-ray diffraction and TGA. The chemical constitution and molecular weight of UHMW-PAN were determined. It was found that the tacticity, crystallinity and thermal stability of UHMW-PAN are higher than ones of nomal PAN, therefore UHMW-PAN is a good membrane materials.
     本文采用 FTIR、粘度法、GPC、1 3C- NMR、X-射线衍射和 TGA等方法 ,对通过悬浮聚合制备的超高分子量聚丙烯腈 (UHMW- PAN)的结构和热性能进行了测定 ,确定了其化学组成和分子量 ,发现其立体规整度、结晶度和热稳定性高于常规聚丙烯腈 (PAN) ,是制备中空纤维膜的较理想材料。
短句来源
     Theoritical analysis, laboratory experiments and industrial tests show that the features like high reactivity, high ash fusion temperature, low content of ash and sulphur, stable chemical constitution and physical properties are the basic demands for direct reduction in rotary kiln.
     理论分析、试验研究及工业试验表明对回转窑直接还原用煤的要求是反应性高,灰熔点高、硫含量低,化学组成和物理性能要适应于工艺要求并力求稳定。
短句来源
     The structure and chemical constitution,and the influ-ence of beating degree,pH value and alum on their electrokinetic characteristics were discussed in detail.
     本文从纤维和细小纤维的结构和化学组成入手,主要论述了纤维和细小纤维的湿部化学特性,并重点探讨了打浆度、pH值和铝盐对纤维素纤维动电特性的影响。
短句来源
     Chemical constitution and microscopic pattern of the inorganic filler in a corona resistant magnetic wire insulating coating was tested and analyzed.
     测试和分析了某型耐电晕电磁线绝缘漆中无机填料的化学组成和微观形貌 ,并测试该电磁线绝缘漆的紫外 可见光吸收谱。
短句来源
     The final properties of polymer materials are not only related with the chemical constitution and structure ,but also depend on the formation and change of morphosis in preparation process mostly.
     高分子材料的最终性能不仅与高分子的化学组成和结构有关,在很大程度上还取决于制备过程中其形态结构的形成与变化。
短句来源
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  化学形态
     HIGH-TEMPERATURE DESULPHURIZATION OF COAL GAS Ⅱ. CHEMICAL CONSTITUTION OF Zn/Fe-BASED SORBENT
     高温煤气脱硫——Ⅱ.锌铁基脱硫剂的化学形态
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  chemical constitution
The very lowQ can be explained by changes in the chemical constitution taking place in the uppermost mantle.
      
Since the properties of insulators are so strongly dependent on their crystallographic and chemical constitution the methods of film preparation determine to a considerable extend their characteristics.
      
The model is used to predict the effects of changes of bed voidage, physical properties, and chemical constitution of the sinter and the effects of gas and solids flow maldistribution on the operation of the furnace.
      
The chemical constitution of tribofilms, generated from zinc dialkyldithiophosphate (ZDDP) and ashless dialkyldithiophosphate (DDP), has been examined by X-ray Absorption Near Edge Structure (XANES) spectroscopy.
      
Chemical constitution of 3d complexes and rate constants of ortho-para positronium conversion reactions
      
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This paper deals with the synthesis of 3-[o-dichloro (or monochloro-) acetamino-p-nitro-plenyl]-propanol (Ⅱ or Ⅱa),structurally varying from chloramphenicol on the one hand by shif-ting the dichloroacetamino group from the aliphatic side-chain to aromatic ring and replacing thesecondary hydroxyl group by hydrogen on the other,for the purpose of investigating the relationbetween biological action and chemical constitution of the antibiotic.The resulting compoundsshowed no inhibiting effect against E.coli,S.thphosa,S.paratyphi...

This paper deals with the synthesis of 3-[o-dichloro (or monochloro-) acetamino-p-nitro-plenyl]-propanol (Ⅱ or Ⅱa),structurally varying from chloramphenicol on the one hand by shif-ting the dichloroacetamino group from the aliphatic side-chain to aromatic ring and replacing thesecondary hydroxyl group by hydrogen on the other,for the purpose of investigating the relationbetween biological action and chemical constitution of the antibiotic.The resulting compoundsshowed no inhibiting effect against E.coli,S.thphosa,S.paratyphi A and B.staphylococcusaureus,and B.subtilis.The compounds Ⅱ and Ⅱa were prepared by a 4-step synthesis starting from o-nitrocin-namyl alcohol (Ⅵ),which upon hydrogenation in the presence of Raney-nickel catalyst led tothe formation of 3-(o-aminophenyl)-propanol (Ⅶ),m.p.65°.By nitrating the latter with amixture of HNO_3 and H_2SO_4,there was formed 3-(o-amino-p-nitrophenyl)-propyl hydrogen sul-phate (Ⅷ),m.p.203°(decomp.); which on subsequent hydrolysis with dilute mineral acidgave the desired product 3-(o-amino-p-nitrophenyl)-propanol (Ⅸ),m.p.90°.In order toestablish the orientation of the nitro group,this compound was converted into its N,O-diacetylderivative (Ⅹ),m.p.128°,which on oxidation with potassium permanganate gave the knowno-acetamino-p-nitrobenzoic acid (Ⅺ).Finally,the compounds Ⅱ,m.p.132°,and Ⅱa,m.p.118°,were obtained by chloroacetylation with an appropriate acid chloride.Direct hydrogenation of o-nitrocinnamaldehyde (Ⅻ) in the presence of Raney-nickel catalystgave rise to 1,2,3,4-tetrahydroquinoline (ⅩⅢ).

本文报告合成氯霉素相似化合物3-[隣二氯(或一氯)乙醯氨基-对硝基苯基]-丙醇。此等化合物对大肠杆菌,伤寒杆菌,副伤寒甲及乙杆菌,金色葡萄球菌及枯草杆菌等细菌均不现抑制作用。说明氯霉素分子上的二氯乙醯氨基从脂肪炼上移至芳香环的相邻位置上,以及仲醇羟基以氢代替后则原有的抗生作用即消失。

A series of α,ω-bis-(p-aminophenoxy)-alkanes was found to show high schi- stomicidal activity in experimental animals but have toxic effects on the eyes. This precluded the clinical use of these compounds on human beings. For this reason, we prepared a series of N, N'-disubstituted derivatives of α,ω-bis-(p-methylamino- phenoxy)-pentane (Ⅰ) and -heptane (Ⅱ) for the purpose to find the most active and least toxic compound, and at the same time, to study the relationship between their chemical constitution...

A series of α,ω-bis-(p-aminophenoxy)-alkanes was found to show high schi- stomicidal activity in experimental animals but have toxic effects on the eyes. This precluded the clinical use of these compounds on human beings. For this reason, we prepared a series of N, N'-disubstituted derivatives of α,ω-bis-(p-methylamino- phenoxy)-pentane (Ⅰ) and -heptane (Ⅱ) for the purpose to find the most active and least toxic compound, and at the same time, to study the relationship between their chemical constitution and schistomicidal activity. R=-CH_2SO·ONa, -CH_2SO_2·ONa, -CH_2COONa, -CH_2CONH_2, -CH_2CN, -CONH_2, -COCH_3, -COOC_2H_5, -CH_2CH_2OH The sodium salts of N, N'-di-methanesulfonic acid (R=-CH_2SO_2·ONa) and N, N'-di-methanesulfinic acid (R=-CH_2SO·ONa) derivatives were prepared by the condensation of sodium formaldehyde bisulfite and sodium formaldehyde sulfo- xylate with the corresponding amines in methanolic alkaline solution respectively. N, N'-di-methanesulfonate derivatives were treated with potassium cyanide to give the corresponding N, N'-di-acetonitril (R=-CH_2CN) derivatives, from which N, N'-di-sodium acetate (R=-CH_2COONa) derivatives were obtained by alkaline hydrolysis. The latter could also be resulted from the hydrolysis of N, N'-di-acet- amide (R =-CH_2CONH_2) derivatives by using the same reagent. Ⅱ was treated with ethyl chloroformate, to give the N, N'-di-ethyl formate (R=-COOC_2H_s) derivative. By the condensation of p-(N-Carbamylmethyl-N-methyl)-aminophenol, p-(N- carbamyl-N-methyl)-aminophenol and p-(N-β-hydroxyethyl-N-methyl)-aminophenol with α,ω-di-bromoalkanes, the corresponding N, N'-di-acetamide, N, N'-di-carbamide (R=-CONH_2) and N, N'-di-β-hydroxyethyl (R=-CH_2CH_2OH) derivatives were obtained respectively. N, N'-di-carbamide derivatives could also be obtained by direct reaction of Ⅰand Ⅱ with potassium cyanate. Tests of these compounds against Schistosonaes japonicum in experimentally infected animals are still in progress and will be reported elsewhere.

α,ω-双-[对-氨基苯氧基]-烷类对感染日本血吸虫病的实驗动物具有显著疗效,惟毒性较大.本文叙述了α,ω-双-[对-甲氨基苯氧基]-戊烷及-庚烷-N,N′双取代衍生物的合成,希望这些衍生物的毒性减低,而疗效增大.n=5或7.R=-CH_2SO·ONa,-CH_2SO_2·ONa,-CH_2COONa, -CH_2CONH_2,-CH_2CN,-CONH_2,-COCH_3,-CH_2CONH_2,-COOC_2H_5.N,N′-双甲亚磺酸鈉及N,N′-双甲磺酸鈉衍生物系以α,ω-双-[对-甲氨基苯氧基]-戊烷Ⅰ及庚烷Ⅱ分別与烴甲亚磺酸鈉及烴甲磺酸鈉在碱性甲醇中作用生成.N,N′-双甲磺酸鈉衍生物与氰化鉀反应得N,N′-双乙腈衍生物,再行水解則得N,N′-双乙酸鈉衍生物.由对-N-氨基碳酰甲基-N-甲氨基苯酚、对-N-氨基碳酰-N-甲氨基苯酚,以及对-N-β-羥乙基-N-甲氨基苯酚分別与α,ω-二溴烷类縮合,得N,N′-双乙酰胺、N,N′-双碳酰胺、以及N,N′-双-β-羥乙基衍生物.N,N′-双碳酰胺亦由Ⅰ及Ⅱ直接与氰酸鉀反应制得。N,N′-双甲酸乙酯衍生物系以Ⅱ与氯代甲酸乙酯作用合成,而N,N′-双乙酰衍...

α,ω-双-[对-氨基苯氧基]-烷类对感染日本血吸虫病的实驗动物具有显著疗效,惟毒性较大.本文叙述了α,ω-双-[对-甲氨基苯氧基]-戊烷及-庚烷-N,N′双取代衍生物的合成,希望这些衍生物的毒性减低,而疗效增大.n=5或7.R=-CH_2SO·ONa,-CH_2SO_2·ONa,-CH_2COONa, -CH_2CONH_2,-CH_2CN,-CONH_2,-COCH_3,-CH_2CONH_2,-COOC_2H_5.N,N′-双甲亚磺酸鈉及N,N′-双甲磺酸鈉衍生物系以α,ω-双-[对-甲氨基苯氧基]-戊烷Ⅰ及庚烷Ⅱ分別与烴甲亚磺酸鈉及烴甲磺酸鈉在碱性甲醇中作用生成.N,N′-双甲磺酸鈉衍生物与氰化鉀反应得N,N′-双乙腈衍生物,再行水解則得N,N′-双乙酸鈉衍生物.由对-N-氨基碳酰甲基-N-甲氨基苯酚、对-N-氨基碳酰-N-甲氨基苯酚,以及对-N-β-羥乙基-N-甲氨基苯酚分別与α,ω-二溴烷类縮合,得N,N′-双乙酰胺、N,N′-双碳酰胺、以及N,N′-双-β-羥乙基衍生物.N,N′-双碳酰胺亦由Ⅰ及Ⅱ直接与氰酸鉀反应制得。N,N′-双甲酸乙酯衍生物系以Ⅱ与氯代甲酸乙酯作用合成,而N,N′-双乙酰衍生物則按常法制取之。

The chemical method of organic qualitive analysis is rather time consuming. This paper presents a simple method of identification, utilizing the data obtained chiefly from a few physical measurements. The method is also suitable for identifying new compounds and compounds whose derivation is unknown.Physical properties, such as density, refractive index, boiling point and viscosity are related to the molecular weight and to the chemical constitution of a molecule. The system presented, based on these correlations,...

The chemical method of organic qualitive analysis is rather time consuming. This paper presents a simple method of identification, utilizing the data obtained chiefly from a few physical measurements. The method is also suitable for identifying new compounds and compounds whose derivation is unknown.Physical properties, such as density, refractive index, boiling point and viscosity are related to the molecular weight and to the chemical constitution of a molecule. The system presented, based on these correlations, enables one to tell the kind as well as the number of functional groups, to detect the presence and the nature of a ring be it saturated or unsaturated, cyclic or heterocyclic, and to construct the empirical formula of the compound. With the empirical formula, and the kind and number of functional groups established, it is possible by the use of references, such as Beilstein and Chemical Abstracts, to list the physical properties of all possible known isomers. Often the detail structure of nknown can be reasonably ascertained by comparing the physical properties of the unknown with those of the known compounds.The method presented covers liquid substances containing carbon, hydrogen and oxygen only, but the same principle is applicable to those compounds containing sulfur, nitrogen, phosphorus and halogens.

本文提出一有机定性分析的简单方法,主要是根据几种物理常数。这法亦适用于鉴定新的或不知来源的化合物。物理性质,如密度、折射率、沸点及粘度,与分子量及化学结构有关。根据此关系可测定官能团的种类及数目;检验有无环;并求得化合物的实验式。知道实验式及官能团的种类、数目后,可从参考书中查出所有可能异构体的物理性质。比较未知物与已知物的物理性质后,通常即能推定未知物的结构式。本文所述方法只可用于含碳、氢及氧的液态化合物,但同样原理应可用于含硫、氮、磷及卤素的化合物。

 
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