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moderate yield
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  中等产率
     Three mono-substituted p-tert-calix[6]arenes (2a~2c) with terminal halogen groups have been synthesized by treating p-tert-calix[6]arene with Br(CH2)4Br, Br(CH2)6Br or ClCH2C≡CCH2Cl in THF us- ing K2CO3 as base in moderate yield, respectively.
     用THF作为反应溶剂,K2CO3作碱,对-叔丁基杯[6]芳烃与二溴丁烷、二溴己烷和1,4-二氯丁炔-2反应以中等产率选择性地合成了含有卤素端基的单取代对-叔丁基杯[6]芳烃2a~2c.
短句来源
     Reaction of ketones with sodium diselenide and sodium hydrogen selenide under the catalysis of n-BuNH2 gave a moderate yield of diselenides in a "one-pot" fashion.
     在正丁胺的催化下,酮与硒氢化钠、二硒化钠乙醇溶液通过“一锅”法反应得到了中等产率的二硒醚。
短句来源
     A new kind of chiral alkylaminobenzylphenol/naphthol was enantioselectively synthesized with moderate yield for the first time through Mannich reaction.
     利用Mannich反应,高对映选择性地以中等产率合成了三个新型烷基氨基苯酚类配体及6个具有C2对称轴的烷基氨基萘酚类配体.
短句来源
  “moderate yield”译为未确定词的双语例句
     The optimal combination of agronomic measures for high quality and moderate yield (2250~2625 kg/ha) is.
     产量在2250~2625kg/ha适产范围的最佳农艺措施组合为:每公顷施氮200.79~204.72kg.
短句来源
     Under the optimized conditions,the cycloadduct was obtained in moderate yield (40%) with highenantioselectivity (90%).
     在优化条件下,产率达到 40%,对映选择性达到 90%ee。
短句来源
     This paper reviews plant cell cultivation solution as biotransformation system in the asymmetric synthesis of chiral hydroxy compounds and natural products, This simplicity of the method, the mildness of the reaction conditions, the high stereoselectivity and the moderate yield provide a new approach to the synthesis of chiral compounds.
     综述了植物细胞培养液作为生物转化系统,以前手性酮类为底物,不对称合成手性羟基化合物.该合成方法新颖独特,操作简便,反应条件温和,产物高度立体选择性,产率适中.此方法还适用于某些难以得到的天然产物的合成.此方法为手性羟基化合物及某些天然产物的合成提供了一条新的途径.
短句来源
     The reaction of diethylamine with triphosgene gave tetraethylurea 1,which was treated with phosphorus pentachloride followed by t-butylamine toafford 1 ,1,3,3-tetraethyl-2-t-butyl guanidine 2. In the presence of 5-10 mol %of 2, a series of terminal epoxides were reacted with phthalimide to form thering-opening products, which, on treating with hydrazine to give 13 ? aminoalcohols in moderate yield.
     以二乙胺和三光气为原料合成四乙基脲1,1进一步与五氯化磷及叔丁胺作用得到1,1,3,3-四乙基-2-叔丁基胍2,以5-10mol%2为催化剂,可实现邻苯二甲酸亚胺对一系列末端环氧化合物的开环,所得产物肼解后得β—氨基醇,产率适中。
短句来源
     A careful exploration of it's reaction conditions using talatisamine as starting material showed that imine 17 was prepared in a moderate yield (65%) by treating talatisamine (16) with DMSO at 100-130℃ for 3h.
     本文以塔拉萨敏为原料在不同条件下与DMSO的反应情况进行考察,发现塔拉萨敏16与无水DMSO于100-130℃反应3h,可较高收率(65%)制得亚胺化合物17,同时得到亚胺季铵盐18(收率33%)。
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     and high water and N,moderate yield.
     高水高氮配合,产量也仅在中产水平徘徊;
短句来源
     The reaction has moderate condition,high selectivity and high yield.
     反应具有条件温和,选择性和收率高等优点。 关键词2-氨基-5-氯吡啶,合成2一氨基一5一氯.
短句来源
     3 : moderate;
     中度,为3级;
短句来源
     On Moderate Marketing
     论适度营销——入世后我国企业竞争谋略的理性思考
短句来源
     10 yield.
     结果表明,复合肥不同施用量对油研10号的产量产生显著影响。
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  moderate yield
It was established that softening in creep of steel with a moderate yield strength is caused primarily by aging and with a high yield strength by pore formation.
      
5,5-Dimethoxy-1,2,3,4-tetrachlorocyclopentadiene reacts with disodium (Z)-butene 1,4-diolate to give spiroketal in moderate yield.
      
Their electrophilic cyclization under the action of the complex Hg(OSO2CF3)2·PhNMe2 led to a moderate yield of a mixture of monocyclic olefins.
      
Methyl α-methylene-Β-hydroxypentanoate was obtained with a moderate yield by the condensation of propionaldehyde with methyl acrylate catalyzed by triphenylphosphine or 1,4-diazabicyclo[2.2.2]octane and initiated by high pressure.
      
Organotin polyethers containing the synthetic estrogen diethylstilbestrol have been made in moderate yield with chain lengths ranging from 20 to 200 repeat units employing the interfacial polycondensation procedure.
      
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Ginsberg et al. reported the failure of obtaining the p-nitrophenylvinylketone (II_a)from the corresponding Mannich base by usual degradation means. In the present, communication, a modified method of degradation of Mannich bases to compounds of vinylketone type has been devised. With the aid of a vacuum distillation apparatus similar to the vacuum sublimation type (Fig. 1) to prevent the product from polymerization by condensing the vapor as soon as it begins to distill over, we were able to decompose the Mannich...

Ginsberg et al. reported the failure of obtaining the p-nitrophenylvinylketone (II_a)from the corresponding Mannich base by usual degradation means. In the present, communication, a modified method of degradation of Mannich bases to compounds of vinylketone type has been devised. With the aid of a vacuum distillation apparatus similar to the vacuum sublimation type (Fig. 1) to prevent the product from polymerization by condensing the vapor as soon as it begins to distill over, we were able to decompose the Mannich base, β-dimethyl (or ethyl) amino-p-(or o-, or m-)-nitropropiophenone, to p-(or o-, or m-) nitrophenylvinylketone (II_a. R= p-NO_2, m. p. 92—93°; II_b, R=o-NO_2, b. p. 124—126°/1—2mm; II_c,R=m-NO_2, m. p. 102—103°) in a moderate yield. The corresponding dibromide, α, β-dibromonitropropiophenone (III_a, R=p—NO_2, m. p. 90—92°; III_b, R=o—NO_2, m. p. 52—54°; III_c, R=m—NO_2, m. p. 58—59°) could be prepared by treating II_a, II_b, II_c with bromine respectively.The authors ve also reported a new method of synthesizing the compounds of the type IV, 1-methoxy-p-(or o-, or m-) nitropropiophenone (IV_a R=p—NO_2, m. p. 67—69°; IV_b, R=o-NO_2, b. p. 142—144°/2—3mm, Oxime, m. p. 160— 162°; IV_C, R=m-NO_2, b. p. 158—161°/2—3mm), by direct treatment of the corresponding bases with methyl alcohol containing a trace of hydrochloric acid in bomb tube at the temperature of little below the melting point of the Mannich bases. This is a simpler method in comparison with the usual 2 or 3-step synthesis starting from Mannich base; that is, to treat the nitrophenylvinylketone with methyl alcohol in the presence of hydrochloric acid or sodium alcoholate, or the dibromide of nitrophenylvinylketone with potassium iodide and methyl alcohol.β-Dimethylamino-o-nitropropiophenone shows weak anti B. smegmatis action, 500γ/ml.

(1)从Mannich碱β-二甲(或二乙)氨基-对(间或隣)-苯丙酮经过改良的真空降解法获得了对(或间或隣)-硝基苯乙烯酮。 (2)对(或间或隣)-硝基苯乙烯酮与溴作用均生成其相应的双溴化合物。 (3)直接从Mannich硷,β-二甲氨基-硝基-(对,间,隣)苯丙酮,与甲醇及微量盐酸在封管中加热,可以获得β-甲氧基-(对,间,隣)苯丙酮,此法此文献上记载的一般方法为简便。

The reduction of the o-aromatic hydroxy carbonyl compounds by the modified Kishner-Wolff method was studied and the mechanism of these reactions was discussed.The reduction of the carbonyl compounds 5 and 6 (R=H or phenyl, i. e. 5a, 6a, 6b) in the naphthol series gave the normal reduction products in good yield. When R is benzyl or phenylethyl (Sb, 5c, 6c), both the normal reduction products and the indazole derivatives were obtained. Reduction of the compounds 5d~g m which R is methyl, ethyl, propyl and isopropyl...

The reduction of the o-aromatic hydroxy carbonyl compounds by the modified Kishner-Wolff method was studied and the mechanism of these reactions was discussed.The reduction of the carbonyl compounds 5 and 6 (R=H or phenyl, i. e. 5a, 6a, 6b) in the naphthol series gave the normal reduction products in good yield. When R is benzyl or phenylethyl (Sb, 5c, 6c), both the normal reduction products and the indazole derivatives were obtained. Reduction of the compounds 5d~g m which R is methyl, ethyl, propyl and isopropyl afforded also both the normal reduction products and the indazole derivatives. It seemed that the increase of the carbon atom in R caused the decrease in the yield of the normal reduction products and the increase in the yield of the indazole derivatives. When R is heptyl (5h), the reaction gave only the indazole derivative in moderate yield.Reductions of the carbonyl compounds in the phenol series all yielded the normal products in good yield no matter R is alkyl or aromatic nucleus.

研究了邻芳族羟基羰基化合物的Kishner-Wolff改良法还原,并讨论了它们的反应机制。萘酚系羰基化合物5与6中的R为H或C_6H_5(5a、6a、6b)时,还原后得高得率的正常还原物;如R为C_6H_5CH_2,C_6H_6CH_2CH_2(5b、5c、6c),则除得正常还原物外,还得含氮环化物;如R为CH_3、CH_3CH_2、CH_3CH_2CH_2、(CH_3)_2CH(5d~g),则同时得正常还原物及含氮环化物,增加R中碳原子数,似乎使正常还原物减少,而含氮环化物增加。当R为CH_3(CH_2)_6(5h),则仅得含氮环化物。苯酚系羰基化合物7中的R为烷烃基或芳族基时,均得高得率的正常还原物。

Maoyancaosu (m-su), a new coumarinolignoid, was isolated from the seeds of Euphorbia lunulata Bge. and Euphorbia esula L. which are two co-occurring species with no conspicuous morphological differences. Biogenetic considerations and spectroscopic analysis (NMR, MS, IR) led to the revision of the original structure (A) of m-su to (B_1). The new structure (B_1) was confirmed by synthesis and comparison of relevant data (mp, Rf, IR). The two substituents at C-1' and C-2' of the dioxane ring in m-su were found...

Maoyancaosu (m-su), a new coumarinolignoid, was isolated from the seeds of Euphorbia lunulata Bge. and Euphorbia esula L. which are two co-occurring species with no conspicuous morphological differences. Biogenetic considerations and spectroscopic analysis (NMR, MS, IR) led to the revision of the original structure (A) of m-su to (B_1). The new structure (B_1) was confirmed by synthesis and comparison of relevant data (mp, Rf, IR). The two substituents at C-1' and C-2' of the dioxane ring in m-su were found to be equatorial and trans to each other from the coupling constant (8Hz)of the two axial hydrogens. It is devoid of any optical activity (589—365 nm) and hence a racemic mixture (R,R+S,S).In our hands the silver oxide for the coupling of Ⅰ and Ⅱ was used in ten-fold excess in order to achieve a moderate yield, in contrast with the equimolar quantity reported in the literature. It is of interest to note that the unnatural isomer (Ⅲ_2, 32%) was actually obtained in much higher yield in the biomimetic synthesis at the expense of the natural one (Ⅲ_1, 10%), apparently because of the reluctance of the electron-poor 7-OH (as compared with 6-OH) of esuletin (Ⅱ) in parting with an electron to form the required free radical. In the plant, esculin (6-glucoside of Ⅱ) or its equivalent is probably involved in the biogenetic pathway, where blocking of the 6-OH will account for the occurrence of m-su (B_1) as the exclusive isomer.

根据生源学说、光谱分析及化学合成,将猫眼草素的原定结构A式修改为B_1式。分子中氧杂环上的两个取代基互为反式,并以外消旋体(R,R+S,S)的形式存在。

 
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