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硝基苯甲酸     
相关语句
  nitrobenzoic acid
     The best condition is n(nitrobenzoic acid)∶n(alcohol)=1∶4, the quantity of catalyst is 1.2 g, the reaction time is 4 hours, the reaction temperature is 78~82°C, the yield is 98.6%, all is based on 0.025 mol nitrobenzoic acid.
     最佳反应条件 :以 0 .0 2 5 mol对硝基苯甲酸为准 ,n(对硝基苯甲酸 )∶ n(乙醇 ) =1∶ 4,催化剂用量为 1 .2 g反应 4h,反应温度 78~ 82°C,产率达 98.6 %。
短句来源
     pNitrobenzoic acid was prepared by oxidation of pnitrotoluene with dioxygen in thepresence of cobaltous acetate and manganous acetate and bromide,under pressure of0 .5~ 0 .8MPa and at temperature of1 2 5~ 1 35℃ . The yield of p nitrobenzoic acid was reached to90 .4 % .
     由乙酸钴、乙酸锰、溴化物催化氧气氧化对硝基甲苯制备对硝基苯甲酸 ,反应压力 0 .5~ 0 .8MPa,温度1 3 0~ 1 3 5℃ ,产率 90 .4%。
短句来源
     It was discovered that oxidation of 4 nitrotoluene by using C 6H 6/MeOH( V/V =5/1)as a solvent at 50℃,2 0MPa O 2 pressure could give 4 nitrobenzoic acid in 66.4% yield and in 99.6% purity
     发现用苯/甲醇混合溶剂(V/V=5/1)在50℃、2.0MPa氧压下反应12h可获得66.4%收率和99.6%纯度的对硝基苯甲酸粗品。
短句来源
     Catalytic synthesis of nitrobenzoic acid with quaternary ammonium salt A-1
     季铵盐A-1催化合成邻硝基苯甲酸
短句来源
     The optimal conditions were found as follows:n(nitro benzoic acid):n(alcohol)=1:6,0·1g Nd_2O_3,reaction time 3 h,reaction temperature 79-81℃,2.5 g nitrobenzoic acid,under these conditions,the yield of the product was 89%.
     对催化剂用量、反应时间、酸醇比、带水剂等因素进行了考察,最佳反应条件为:0.015 mol对硝基苯甲酸,n(对硝基苯甲酸):n(乙醇)=1:6,催化剂用量0.1 g,反应时间3 h,反应温度79~81℃,收率大于89%。
短句来源
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  nitro-benzoic acid
     p-Nitro-ethybenzoate was synthesized from nitro-benzoic acid and alcohol by using Nd_2O_3 as catalyst.
     以三氧化二钕为催化剂、对硝基苯甲酸和乙醇为原料合成了对硝基苯甲酸乙酯。
短句来源
  4 nitrobenzoic acid
     It was discovered that oxidation of 4 nitrotoluene by using C 6H 6/MeOH( V/V =5/1)as a solvent at 50℃,2 0MPa O 2 pressure could give 4 nitrobenzoic acid in 66.4% yield and in 99.6% purity
     发现用苯/甲醇混合溶剂(V/V=5/1)在50℃、2.0MPa氧压下反应12h可获得66.4%收率和99.6%纯度的对硝基苯甲酸粗品。
短句来源
     Study on Oxygen Oxidation of 4 Nitrotoluene to 4 Nitrobenzoic Acid I Effect of Solvents on Yields of 4 Nitrobenzoic Acid
     氧气氧化对硝基甲苯合成对硝基苯甲酸的研究 Ⅰ.溶剂对对硝基苯甲酸收率的影响
短句来源
     Effect of various solvents on yields of 4 nitrobenzoic acid synthesized by oxygen oxidation of 4 nitrotoluene was investigated.
     研究了几种溶剂对氧气液相氧化对硝基甲苯合成对硝基苯甲酸收率的影响。
短句来源
     METHODS: Tyrosine and 4nitrobenzoic acid were used as the major reactants to obtain the target compounds by multistep synthesis.
     方法:以酪氨酸及对硝基苯甲酸等为主要原料经多步合成,对所得化合物用比浊法测定在1×10-6mol·L-1时对体外血小板聚集的抑制率。
短句来源
     In chlorobenzene,4 nitrobenzoic acid and sulfuryl chloride was refluxed at 131℃ for 7 h. Then acylation was carried out in the presence of anhydrous alchlor at 80℃ for 2 h that gave 4 nitro 4′ chlorobenzophone in 65.18% yield.
     对硝基苯甲酸和二氯亚砜在氯苯中回流数小时氯化后 ,在无水三氯化铝作用下酰化 ,得到 4-硝基 -4′-氯二苯甲酮。
短句来源
  “硝基苯甲酸”译为未确定词的双语例句
     Study on Synthesis of Ethyl p-Nitrobenzoate With the Composite Solid Superacid TiO_2/SO_4~2-Al_2O_3 Catalyst
     TiO_2/SO_4~2-Al_2O_3催化合成对硝基苯甲酸乙酯的研究
短句来源
     The solubilities of ο-nitrobenzoic acid in aqueous solutions of NaCl, KCl, LiBr, NaBr, KBr, KNO_3, KSCN, NaClO_4 and (CH_3)_4NBr were determined at 25℃.
     在25°,作者测定邻硝基苯甲酸在九种盐(NaCl,KCl,LiBr,NaBr,KBr,KNO_3,KSCN,NaClO_4和(CH_3)_4NBr)溶液中的溶度。
短句来源
     L-1 HClO4 or pyridine (Py) in 0.1 mol?
     L-1HClO4中对硝基苯甲酸(PNBA)和0.1mol?
短句来源
     Synthesis of 2,3,4,5-Tetrafluorobenzoic Acid
     2,3,4,5-四氟-6-硝基苯甲酸的合成
短句来源
     n(Ⅱ):n (Ac2O)=1:2, in excess acetyl anhydride after adding concentrated nitric acid in ice-water bath, re-fluxing 3 min and under microwave irradiation in high grade, 3-nitro-4-acetamidobenzoic acid (Ⅲ) was obtained in 85. 3% yield;
     n(Ⅱ):n(Ac2O)=1:2,使用过量乙酸酐,在冰水浴中滴完浓硝酸后,在微波功率800 W,回流3 min后,4-乙酰氨基-3-硝基苯甲酸(Ⅲ)的收率为85.3%;
短句来源
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  nitrobenzoic acid
This conclusion was verified by 5,5'-dithiobis(2-nitrobenzoic acid) modification.
      
This conclusion was verified by 5,5'-dithiobis(2-nitrobenzoic acid) modification.
      
Isomer-selective carbon-paste electrodes for the determination of nitrophenol, nitroaniline, and nitrobenzoic acid by adsorption
      
Conditions for the isomer-selective determination ofo- andp-isomers of nitrophenol, nitroaniline, and nitrobenzoic acid in aqueous solutions were optimized.
      
Under these conditions, 4-nitrobenzoic acid was the main reaction product (96.6%).
      
更多          
  nitro-benzoic acid
Baicalin and the internal standard, 4-nitro-benzoic acid, were extracted twice from the homogenized solution with acetonitrile and after centrifugation the combined extracts were evaporated.
      
Diethylpyrocarbonate (DEP), dithiothreitol (DTT), 5,5'-dithio-bis-(2-nitro-benzoic acid) (DTNB), or N-ethylmaleimide (NEM) did not affect enhancement of ATP-activated current by protons.
      
A continuous spectrophotometric assay for CBAH activity was developed using a conjugate of cholic acid and the chromophore, 5-amino-2-nitro-benzoic acid.
      
Seventy-five compounds, derivatives of 4-nitro-benzoic acid and of 4-amino-benzoic acid, were investigated for their tuberculostatic activity.
      
A number of 4-nitro-benzoic acid esters of branched alcohols, which proved to be active on the synthetic medium, showed a considerably lower activity on the protein-containing Beeuwkes medium.
      
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  其他


A new iodine heterocycle, 3,6-dinitro-dibenzopyriodonium bisulfate (Ⅲa), prisms, m.p. 217.5° (dec.), was found to be readily prepared in 86% yield by treating 4,4'-dinitrodiphenylmethane with iodosyl sulfate, which was conveniently obtained by stirring a stoichiometric mixture of iodine and sodium iodate in concentrated sulfuric acid. The iodonium compound (Ⅲa) could be converted to the chloride (Ⅲb), colorless needles, m.p. 211.5° (dec), bromide (Ⅲc), yellowish needles. m.p. 217.5° (dec.), iodide (Ⅲd), yellow...

A new iodine heterocycle, 3,6-dinitro-dibenzopyriodonium bisulfate (Ⅲa), prisms, m.p. 217.5° (dec.), was found to be readily prepared in 86% yield by treating 4,4'-dinitrodiphenylmethane with iodosyl sulfate, which was conveniently obtained by stirring a stoichiometric mixture of iodine and sodium iodate in concentrated sulfuric acid. The iodonium compound (Ⅲa) could be converted to the chloride (Ⅲb), colorless needles, m.p. 211.5° (dec), bromide (Ⅲc), yellowish needles. m.p. 217.5° (dec.), iodide (Ⅲd), yellow powder, m.p. 164° (dec.) and picrate (Ⅲe), yellow needles, m.p. 183-184° (dec.) by treating its solution in formic acid with a 50% formic acid solution of sodium chloride, sodium bromide or potassium iodide or with an alcoholic solution of picric acid respectively. The structural formula (Ⅲ) of the new iodonium compounds was derived by means of potassium permanganate oxidation of the bisulfate (Ⅲa) to 2-iodo-4-nitrobenzoic acid, and by thermal decomposition of the iodide (Ⅲd) to 2,2'-diiodo-4, 4'-dinitro-diphenyl-methane (Ⅵ) (60% yield), m.p. 158-159°, the structure of which was shown by analysis and by comparison with what is known about the behavior of other iodonium iodides, e.g., 4,4'-dicarboethoxy-diphenylene iodonium iodide (Ⅷ), which decomposes on heating yielding 2,2'-diiodo-4,4'-dicarboethoxydiphenyl (Ⅸ). Compound (Ⅵ) could be reduced with tin and hydrochloric acid to a diamino compound (Ⅶ).The iodonium salt (Ⅲa) possessed the interesting property that when it was treated with dilute sodium hydroxide solution at room temperature with the addition of ethyl acetate or pyridine, a beautiful bluish-green color gradually developed in the organic layer. When it was heated with dry pyridine, the same color developed. The colored ethyl acetate solution changed to brownish yellow on acidification with dilute sulfuric acid and regained its bluish-green color when the acidified solution was made alkaline.Under similar conditions as described above, reaction between diphenylmethane and iodosyl sulfate gave a grayish substance, m.p. 210-212°, which was insoluble in common solvents. This substance was possibly a polymeric compound of formula (Ⅺ).

1.4,4'-二硝基二苯甲烷(Ⅰ)與硫酸亚碘醯(Ⅱ)作用,生成一种新型的含碘杂環化合物(Ⅲ_a)。 2.化合物Ⅲ_a與氯化鈉、溴化鈉、碘化鉀或苦味酸作用,置换成为相應的鹵化物(Ⅲ_(b-d))或苦味酸盐(Ⅲ_e)。 3.用鹼性高錳酸鉀溶液氧化化合物Ⅲ_a得2-碘代-4-硝基苯甲酸。 4.碘化物(Ⅲ_d)在它的熔點温度进行熱解,得2,2'-二碘代-4,4'-二硝基二苯甲烷。继还原,得相應的二氨基化合物。二者均为新化合物。 5.化合物Ⅲ_a用氢氧化鈉溶液处理,得到蓝绿色物質,溶於乙酸乙酯、丙酮、吡啶中成鲜明的蓝绿色溶液。乙酸乙酯溶液酸化後变成黄棕色,再鹼化復现蓝绿色。将化合物Ⅲ_a在无水吡啶中加熱,亦呈现蓝绿色。 6.在类似的条件下,二苯甲烷與硫酸亚碘醯起作用。

Recently, Funke and Kornmann synthesized chloramphenicol from 4-aryl-5-halo-dioxane-1,3 which was obtained by the addition of hypobromous acid to cinnamyl alcohol and followed by cyclization with benzaldehyde. Similar compound of this type should be prepared by the addition of formaldehyde and β-halostyrene, the general formula of which may be represented as follows:■ The above reaction was studied by Beets but he failed to isolate the desired product and the starting material was almost quantitatively recovered....

Recently, Funke and Kornmann synthesized chloramphenicol from 4-aryl-5-halo-dioxane-1,3 which was obtained by the addition of hypobromous acid to cinnamyl alcohol and followed by cyclization with benzaldehyde. Similar compound of this type should be prepared by the addition of formaldehyde and β-halostyrene, the general formula of which may be represented as follows:■ The above reaction was studied by Beets but he failed to isolate the desired product and the starting material was almost quantitatively recovered. After a careful study of his method, we found that his failure is probably due to the use of an insufficient amount of acid.Further, he carried out the reaction in heterogenous phases. Either by raising the acid concentration (50% of Sulfuric acid in contrast to 5% as used by Beet's) or by carrying out the reaction in acetic acid, a fairly good yield (60%-90%) of 4-aryl-5-halo-dioxane-1,3 was obtained. It is very interesting that we could isolated two products having the same elementary cmposition, either by running the reaction in aqueons medium or in acetic acid. Probably we are dealing with two diasteroisomers as the addition of formaldehyde to bromo or chlorostyrene may proceed either according to the cis or trans mood. The dioxanes obtained above were nitrated and the para nitrophenyl-dioxanes were isolated.The latter compounds all yield para-nitrobenzoic acid on oxidation: ■ The present authors succeded for the first time in isolating two diasteroisomers from the Prins reaction.The nature of these two isomers as well as their utilization for the synthesis of chloramphenicol and related compounds are now under investigation in this laboratory.

Beets在进行β-溴苯乙烯舆甲醛的反应时遭受到了失败,我们考虑其失败的原因在于进行反应时,应用了浓度过低的酸,而且是在多相下进行,因而影响到反应速度.在增加反应的酸度时,或将反应在均相下进行,皆以极好的产率得到了β-溴苯乙烯或氯苯乙烯奥甲醛的反应产物4-芳-5-卤-1,3-二氧六环,后者对于提供氯霉素的新合成法是一个有趣的化合物. 我们在Prins反应的产物中,第一次得到二个异构体,二者沸点不同,可以顺利的分开.我们认为这可能是两种非对映体,关于这两个异构体的性质还在研究中. 得到的高沸点或低沸点4-苯-5-卤-1,3-二氧六环,易硝化而形成相应的对位一元硝化产物,它们经过侧链氧化,都形成对位硝基苯甲酸. 作者正利用自己所合成的二种4-芳-5-卤-1,3-二氧六环的异构体,企图经四步手续变为氯霉素.

A method of indirect polarographic determination of Zirconium is proposed. The method consists of the foIlowing steps: (1)Zirconium is precipitated by m—nitrobenzoie acid; (2) The precipitate is filtered, washed thoroughly with hot water, and redissolved in hot solution of perchloric acid and tartaric acid; (3) With potassium hydrogen phthalate as the supporting electralyte, α—naphthol as the maximum suppressor, the mnitrobenzoic acid equivalent to Zirconium in the precipitate is determined polarographically....

A method of indirect polarographic determination of Zirconium is proposed. The method consists of the foIlowing steps: (1)Zirconium is precipitated by m—nitrobenzoie acid; (2) The precipitate is filtered, washed thoroughly with hot water, and redissolved in hot solution of perchloric acid and tartaric acid; (3) With potassium hydrogen phthalate as the supporting electralyte, α—naphthol as the maximum suppressor, the mnitrobenzoic acid equivalent to Zirconium in the precipitate is determined polarographically. The conditions for indirect polarographic determination of Zirconium are discussed, The method can be used for the determination of small amounts of Zirconium in the presence of large amounts of Uranium, Cerium and Thoriun with a relative error less then 4%. For the purpose of examing applicability of the proposed method, Zirconium in Zircon containing small amonnt of iron was determined and the result was consistent with that obtained by the classical Colorimetric method.

本文介绍了锆的间接极谱测定法。该方法是基于锆用间硝基苯甲酸来沉淀,过滤,洗滌后,再溶解沉淀于过氯酸和酒石酸的混合热溶液中,以隣苯二甲酸氢鉀为支持电解质,α—萘酚为极大抑止剂,极谱测定与沉淀中锆相当的间硝基苯甲酸的含量。讨论了适于间接极谱测定锆的条件。本方法可望适用于大量鈾、铈、和钍存在下微量锆的测定,其相对误差不大于4%。为了验证其适用性,已将本法用于含少量铁的锆英石中锆的测定,得到了与经典的比色法相符的结果。

 
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