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cyclic
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    Study on Syntheses of Chiral Hydantoin& Cyclic Dipeptide and Their Effects on Asymmetric Cyanohydrination
    手性海因、二肽的合成及不对称氰醇化研究
短句来源
    Studies on Heterocyclic Compounds Containing Iodine Ⅵ Borohydride Reduction of Cyclic Iodonium Salts and Synthesis of 3,6-Diaminodibenzopyriodonium Salts
    碘杂化合物的研究Ⅵ几种碘杂化合物与硼氢化钠(钾)反应及3,6一二氨基二苯并碘六盐的合成
短句来源
    STUDIES ON HETEROCYCLIC COMPOUNDS CONTAINING IODINE Ⅵ. BOROHYDRIDE REDUCTION OF CYCLIC IODONIUM SALTS AND SYNTHESIS OF 3, 6-DIAMINODIBENZOPYRIODONIUM SALTB
    碘杂化合物的研究——Ⅵ.几种碘杂化合物与硼氢化钠(钾)反应以及3,6-二氨基二苯并碘六元盐的合成
短句来源
    Studies on Cyclic and Network-like Organoboron Compounds Ⅱ.Syntheses and Properties of some 1.2-Oxaborolanes
    状和网络状有机硼化合物的研究 Ⅱ.1,2-氧硼杂戊类化合物的合成与性质
短句来源
    ~(29)Si NMR STUDY OF LINEAR AND CYCLIC ORGANOSILICON COMPOUNDS
    线性和体有机硅化合物的~(29)Si NMR研究
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  环状
    Catalytic Synthesis of Cyclic Carbonates under Supercritical Conditions
    超临界条件下环状碳酸酯的催化合成
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    1,3-Dipolar Cycloaddition of Chiral Cyclic α-Alkoxycarbonylnitrones and Synthesis of N-terminal Amino Acid Component of Nikkomycin B
    环状手性α-烷氧羰基硝酮的1,3-偶极环加成反应研究和天然产物nikkomycin B的N-端氨基酸片断合成研究
短句来源
    Studies on Cyclic and Network-like Organoboron Compounds Ⅱ.Syntheses and Properties of some 1.2-Oxaborolanes
    环状和网络状有机硼化合物的研究 Ⅱ.1,2-氧硼杂戊环类化合物的合成与性质
短句来源
    CONFORMATIONS AND ELECTRONIC STRUCTURES OF CYCLIC 3',5'NUCLEOTIDES
    环状核苷酸的构象和电子结构(英文)
短句来源
    STUDIES ON CYCLIC AND NETWORK-LIKE ORGANOBORON COMPOUNDS Ⅶ. RAMAN SPECTRA AND STRUCTURES OF 2, 2′-ALKYLENEDIOXY-BIS-1, 2-OXABOROLANES
    环状和网络状有机硼化合物的研究 Ⅶ.2,2′-烷撑二氧基-双-(1,2-氧硼杂环戊烷)类的拉曼光谱及结构
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  “cyclic”译为未确定词的双语例句
    Studies on Design, Synthesis and Molecular Recognition of Cyclic Peptides Containing Polyamine, Disulfide or Thioether Structure
    含多胺、二硫键以及硫醚结构的环肽的设计合成及分子识别研究
短句来源
    Preparation of 2-Halo-2t-Iodo-Diphenyl Compounds by Thermal Decomposition of Cyclic iodonium halides
    由碘杂环卤化物热分解制备2-卤-2-碘-二苯基化合物
短句来源
    MICROCOMPUTER PROGRAN DESIGN AND APPLICATION IN STUDY ON BINARY CYCLIC COPOLYMERIZATION NETWORK
    计算机在二元环化共聚网络研究中的程序设计与应用
短句来源
    A CONVENIENT WAY OF ASSIGNING R/S CONFIGURATION IN CYCLIC COMPOUNDS
    环状化合物R/S构型标记的一种简便方法
短句来源
    Cyclic Voltammetric Study on the Transfer Mechanism of Alkali Metal Ions Across Liquid-Liquid Interface Facilitated by Triton X-100
    Triton X-100推动碱金属离子在液/液界面上转移的机制和伏安行为
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  cyclic
This family includes all modular representations of cyclic groups.
      
Universal Spectra and Tijdeman's Conjecture on Factorization of Cyclic Groups
      
Obviously every invariant subspace (under translation and modulation) is cyclic if it has a subspace WH frame.
      
Continuous Wavelet Transforms from Semidirect Products: Cyclic Representations and Plancherel Measure
      
Functions whose translates span Lp(R) are called Lp-cyclic functions.
      
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The Mannich bases derived from phenylacetone (Ⅰ,R=Me)and dibenzyl ke- tone (Ⅰ,R=CH_2Ph) prepared in our previous work gave expected semicarba- zones(Ⅱ) in neutral or slightly acidic media.Degradation of their methiodides gave vinyl ketone semicarbazones (Ⅲ).The structure of the latter was shown by their characteristic ultra-violet light absorption properties,and they gave in- tense absorption bands near 260 mμ.The pyrazolinecarboxamides (Ⅳ),if formed,would behave more like saturated semicarbazones such as Me·CO·CHMePh...

The Mannich bases derived from phenylacetone (Ⅰ,R=Me)and dibenzyl ke- tone (Ⅰ,R=CH_2Ph) prepared in our previous work gave expected semicarba- zones(Ⅱ) in neutral or slightly acidic media.Degradation of their methiodides gave vinyl ketone semicarbazones (Ⅲ).The structure of the latter was shown by their characteristic ultra-violet light absorption properties,and they gave in- tense absorption bands near 260 mμ.The pyrazolinecarboxamides (Ⅳ),if formed,would behave more like saturated semicarbazones such as Me·CO·CHMePh and CH_2Ph·CO·CHEtPh,which gave maxima located at about 230mμ.The vinyl ketone semicarbazones could not be converted to the cyclic compounds (Ⅳ) by treatment with concentrated sulphuric acid.It was recalled that Δ~2-isoxazolines,beside vinyl ketone oximes,were obtained by us previously from the degradation of Mannich base oxime methiodides. Both the dimethylamino(I:R=CH_2Ph,R'=Me) and the diethylamino(I: R=CH_2Ph,R'=Et) compounds gave the identical product (Ⅷ) on treatment with semicarbazide hydrochloride in the presence of excess sodium acetate.It was recalled that an abnormal compound,m.p.101-102,was formed by these two Mannich bases on treatment with hydroxylamine hydrochloride and sodium acetate.This product might be (Ⅶ),formed by elimination of a mole of hy- droxylamine from (Ⅸ),which is analogous to (Ⅷ). Treatment of the Mannich base (I,R=CH_2Ph,R'=Me) itself with sodium acetate gave dibenzyl ketone.This is the reverse change of the original Mannich reaction.However,its methiodide,on degradation with sodium hydroxide, gave a vinyl ketone which readily dimerised into a dihydropyran (Xa or Xb). Several expected pyrazolines were obtained from the Mannich bases and phenylhydrazine.Their ultra-violet light absorption characteristics were listed.

几个 Mannich 碱在中性或微酸性的情况下制成它们的缩氨基脲,其中一个Mannich 碱在碱性情况下形成一个含有两分子氨基脲的物质。那些 Mannich 碱缩氨基脲的季铵碱当在碱性情况下递降时生成乙稀酮的缩氨基脲,而不生成环状的化合物(Ⅳ)。从二苯甲基酮衍生的一个 Mannich 碱经醋酸钠作用后变为原来的1,3-二苯基丙酮,但这个 Mannich 碱的季铵盐经碱作用后成为乙稀酮,而这个乙烯酮迅速贰聚。几个4,5-二氢隣二氮杂茂自 Mannich 碱如预期地形成。上列许多产物的紫外线光谱曾经测定。

5,5-Dimethylhydantoin was prepared and allowed to react with an excess of acrylonitrile in dioxane in the presence of potassium hydroxideas a catalyst, giving 1,3-di-(β-cyanoethyl)-5,5- dimethylhydantoin, which on hydrolysis in hydrcchloric acid was converted to 1,3-di-(β-carboxy- ethyl)-5-dimethylhydantoin. Reactions of acrylonitrile with compounds structurally related to hydantoin, such as cyclic ureides, thiohydantoins and rhodanines, are now under investigation.

5,5-二甲基乙內醯脲和過量的丙烯腈在1,4-二氧六圜內及苛性鉀的催化作用下,發生反應,產生1,3-二(β-腈乙基)-5,5-二甲基乙內醯脲。後者經水解後,產生1,3-(β-羧乙基)-5,5-二甲基乙內醯脲。

The influence of 6-aminocaproic acid on the polymerization of caprolactam has been studied.Samples of five sets of different mole ratios of the catalyst and caprolactam were sealed inseparate tubes and heated at 230±1° in a specially designed tube furnace.They were takenout at various time intervals and analyzed for the contents of monomer,cyclic oligomer andhigh polymer.The average molecular weights of the polymer were also determined.Experimental results showed that the formation of the polymer and the...

The influence of 6-aminocaproic acid on the polymerization of caprolactam has been studied.Samples of five sets of different mole ratios of the catalyst and caprolactam were sealed inseparate tubes and heated at 230±1° in a specially designed tube furnace.They were takenout at various time intervals and analyzed for the contents of monomer,cyclic oligomer andhigh polymer.The average molecular weights of the polymer were also determined.Experimental results showed that the formation of the polymer and the consumption ofthe monomer were both rapid at the beginning of the reaction,then became slow,and finallyapproached a definite proportion.The contents of the cyclic oligomer remained nearly constantthroughout of the reaction course.The ratio of the polymer,monomer and cyclic oligomerapproached a definite value in all five sets of experiments.The number average molecularweights of the polymer raised also rapidly at the beginning,and became gradually slow duringthe course of the reaction.The molecular weights of the sets using smaller quantifies of catalystexceeded,after a certain time interval,those of the sets using larger quantities of the catalyst.At the final stage,the molecular weights of the different sets all approached to their appropriatevalues.It was suggested,in view of these results,that 6-aminocaproic acid acted as the center ofgrowing chain and at the same time as an initiator which induced the formation of new chainsfrom caprolactam.During the course of the reaction,addition polymerization,polycondensa-tion,chain splitting and chain interchange occurred concurrently.Addition polymerizationdominated at the earlier stage,and the polycondensation between macromolecules followed.Thesystem of ultimate equillibrium between monomer,cyclic oligomer,high polymer and waterwas finally established by chain splitting and chain interchange.

6-氨基己酸对已内醯胺聚合反应的影响曾进行了研究。分别以五种不同量的6-氨基己酸为催化剂于230±1°在封管中进行己内醯胺的聚合。测定其各组试样在各反应时间后所得聚合产物中的单体含量,低聚体含量和聚合体生成量,以及聚合体的数均分子量。实验结果显示,单体含量随反应时间而迅速减少,聚合体生成量则迅速增加,均随催化剂用量而有不同的速度。最后各组之单体含量及聚合体生成量均分别趋于一定的数值。低聚体在各反应时间内均大致保持一定的量。各组聚合体的数均分子量,开始时以催化剂用量最多者上升最快,催化剂用量较少者经若干时间以后逐渐超过催化剂用量较多者。最后,各组的数均分子量均各自分别达到一定的数值。我们推论,6-氨基己酸对己内醯胺具有引发和生链的作用,而各级聚合体亦有同样作用。在反应过程中,加聚、缩聚、降解和交换等反应均同时存在,在起始时以加聚为显著,伴之而起的即有大分子间的缩聚,最后通过链的降解和链的交换连到单体、圜型低聚体和各级聚合体与水之间的一个总平衡体系。

 
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