助手标题  
全文文献 工具书 数字 学术定义 翻译助手 学术趋势 更多
查询帮助
意见反馈
   condensing agent 的翻译结果: 查询用时:0.009秒
图标索引 在分类学科中查询
所有学科
有机化工
化学
更多类别查询

图标索引 历史查询
 

condensing agent
相关语句
  缩合剂
     NH4HCO3 is used for controlling pH and as condensing agent promoter.
     NH4HCO3作助缩合剂和控制pH。
短句来源
     Then, water-soluble carbodiimide was used as condensing agent to catalyze the reaction between the carboxyl groups and the amino groups to graft the collagen covalently on the PLLA-g-PMAA surface.
     利用水溶性碳化二亚胺作为缩合剂 ,使 PLLA-g-PMAA表面的羧基和胶原分子中的氨基发生缩合反应 ,从而将 型胶原接枝在 PLLA表面 ;
短句来源
     The yield reached 86.3% when the condensing agent was solid sodium hydroxide which was laid on active aluminium.
     当用负载于活性Al_(2)O_(3)上的固体NaOH作缩合剂时,收率可达86.3%.
短句来源
     Inprovement of the Condensing Agent on the Synthesis of Phenolphthalein
     酚酞合成中缩合剂的改进
短句来源
     Compound 4 was synthesized with an improved condensing agent.
     合成化合物 4时 ,文献缩合剂为氢氧化钾和相转移催化 ,改为乙醇钠为缩合剂 ;
短句来源
更多       
  冷凝剂
     Aspen Plus 10.2 software is adopted to simulate the condensing agent degassing column of LLDPE plant, and the operating pressure, operating temperature, heat load of condenser and reboiler, feed temperature and separating effect are analyzed. Optimum operating conditions are defined.
     采用Aspen Plus 10.2软件模拟并分析了低压聚乙烯冷凝剂脱气塔的操作压力、操作温度、塔的冷凝器和再沸器的热负荷、进料温度与分离效果之间的关系,确定了该塔较佳的操作条件。
短句来源
  “condensing agent”译为未确定词的双语例句
     In the presence of ketene as a condensing agent, 5-arylfuran-2 (3H)-ones (2a~e) were obtained from β-aroylpropionic acids (la~c) in good yields and N-aroylpropionylthiazolidine-2-thiones (3a~c) were prepared from reaction of β-aroylpropionic acids (la~c) with thiazolidine-2-thione in the presence of triethylamine.
     由β-芳甲酰丙酸(1a~e)在乙烯酮存在下合成了5-芳基-2(3H)呋喃酮(2a~e),β-芳甲酰丙酸(1a~c)与四氢噻唑-2-硫酮在碘代-1-甲基-2-氯吡啶盐及三乙胺存在下反应合成N-芳甲酰丙酰基四氢噻唑-2-硫酮(3a~c)。
短句来源
     3-Alkoxypropionyl-l,3-thiazolidine-2-thiones 2a-i were synthesized from 3-alkoxy-propionic acid and 1, 3-thiazolidine-2-thione by using cyanuric chloride as the condensing agent.
     在三聚氯氰存在下由烃氧丙酸与四氢噻唑-2-硫酮反应得到N-烃氧丙酰四氢噻哇-2-硫酮(2a-i),由2a,c-h与格氏试剂反应得到烃氧乙基苯基酮(3a,c-h).
短句来源
     The result showed that the yield of aromatic glycidic ester is 66-87% with DB-18-C-6 as catalyst, anhydrous ethanol and petrleym ethers (b. p. 90-12℃) as solvents and sodium ethoxide as a condensing agent.
     结果表明:采用无水乙醇与石油醚为混合溶剂,以DB-18-C-6作催化剂,能使产率明显提高,产物经元素分析和红外光谱与核磁共振谱鉴定,均与文献报道相符合.
短句来源
     2) In the presence of a new condensing agent DMTMM, the chiral amide ligand C-1 was easily derived from ferrocenylphosphine-primary amines and 2-pyridinecarboxylic acid.
     2.在新型缩合试剂DMTMM存在下,由(R)~(凡)一州玩一。 (P一l)与2一p比睫梭酸便利、高效地合成了一个新的手性二茂铁麟一酞胺化合物(c一1)。
短句来源
     Its C terminal was composed of multiple lysine residues, which played as a DNA condensing agent, whereas the N terminal was the receptor binding domain of Epidermal Growth Factor(N32~K48).
     方法人工合成了一种N端含多个赖氨酸残基,C端为人表皮生长因子(EGF)的受体结合域的33肽,此合成肽(K9E肽)既具有DNA结合活性,又能为细胞表面EGF受体所识别并内在化。
短句来源
更多       
查询“condensing agent”译词为用户自定义的双语例句

    我想查看译文中含有:的双语例句
例句
为了更好的帮助您理解掌握查询词或其译词在地道英语中的实际用法,我们为您准备了出自英文原文的大量英语例句,供您参考。
  condensing agent
N-Substituted amides of 2-cyanopenta-2E,4-dienoic acid were synthesized by condensation ofN-substituted cyanoacetamides with acrolein in a dioxane-DMSO solution in the presence of Zn(OAc)2·2H2O as a condensing agent.
      
A modified method was used to obtain N-trifluoroacetoxybenzotriazole, a new condensing agent for peptide synthesis.
      
Trifluoroacetoxybenzotriazole as a condensing agent in peptide synthesis
      
The chemical nature of the condensing agent (oleum or polyphosphoric acid) does not affect the chemical structure of the card polymer obtained.
      
Solid-phase triester synthesis of modified triuridylates using an effective condensing agent
      
更多          


In a previous paper of this series of investigations the syntheses of p-, m- and o-[bis-(β-chloroethyl)-amino]-methyl-phenylalanine dihydrochlorides (Ⅱ, designated as AT-290, AT-582, and AT-581 respectively) by substituting one hydrogen atom of the methyl group of HN_2 with the phenylalanyl group, had been described. In this investigation, 2- and 3-[bis-(β-chloroethyl)-amino]-methyl-4-hydroxyphenylalanine dihydrochlorides (Ⅳ and Ⅴ, designated as AT-786 and AT-916 respectively) had been synthesized, however,...

In a previous paper of this series of investigations the syntheses of p-, m- and o-[bis-(β-chloroethyl)-amino]-methyl-phenylalanine dihydrochlorides (Ⅱ, designated as AT-290, AT-582, and AT-581 respectively) by substituting one hydrogen atom of the methyl group of HN_2 with the phenylalanyl group, had been described. In this investigation, 2- and 3-[bis-(β-chloroethyl)-amino]-methyl-4-hydroxyphenylalanine dihydrochlorides (Ⅳ and Ⅴ, designated as AT-786 and AT-916 respectively) had been synthesized, however, by substituting one hydrogen atom of the methyl group of HN_2 with the tyrosinyl group. Compound Ⅳ and Ⅴ were prepared by the sequences of reactions as shown in the Chinese text. The starting material is diethyl 2 (or 3)-bromomethyl-4-acetoxy-benzyl-formamidomalonate (Ⅹ). Ⅹ can be obtained via two different routes as follows: (1). Ethyl m-(or o-) cresyl carbonate (Ⅵ) was chloromethylated with monochloromethyl ether in the presence of antimony pentachloride as the condensing agent to yield 2 (or 3)-methyl-4-acetoxy-benzyl chloride (Ⅶ). The latter was condensed with diethyl formamidomalonate in the presence of sodium ethoxide to afford diethyl 2 (or 3)-methyl-4-hydroxybenzyl-formamidomalonate (Ⅷ), which was then acylated with acetic anhydride to form the 4-acetyl derivative (Ⅸ). Ⅸ was converted readily to Ⅹ by employing N-bromosuccinimide in the presence of a small amount of dibenzoyl peroxide in dry carbon tetrachloride. (2). 3-Aldehydo-4-hydroxybenzyl chloride (ⅩⅤ) was condensed with diethyl formamidomalonate, and the resulting product (ⅩⅥ) was then acylated to diethyl 3-aldehydo-4-acetoxybenzyl-formamidomalonate (ⅩⅦ). The latter was first subjected to catalytic hydrogenation in the presence of Pd-C to diethyl 3-hydroxymethyl-4-acetoxybenzyl-formamidomalonate (ⅩⅧ) and followed by bromination with phosphorous tribromide in methylene dichloride to afford Ⅹ. Compound Ⅹ was treated with diethanolamine in absolute alcohol to give diethyl 2 (or 3)-[bis-(β-chloroethyl)-amino]-methyl-4-acetoxybenzyl-formamidomalonate (Ⅺ or ⅩⅨ), which, without being isolated in a pure state, was chlorinated with purified thionyl chloride in dichloromethane. The chlorinated product in dichloromethane was passed through a column of aluminium oxide to give diethyl 2 (or 3)-[bis-(β-chloroethyl)-amino]-methyl-4-hydroxybenzyl-formamidomalonate (Ⅻ or ⅩⅩ). Compound Ⅺ can also be obtained from Ⅷ in the following way: Ⅷ was reacted with ethyl chloroformate in the presence of potassium hydroxide to diethyl 2 (or 3)-methyl-4-carbethoxyloxybenzyl-formamidomalonate (ⅩⅢ). Among ⅩⅢ, the 1,2,4-isomer (ⅩⅢa) was readily converted to diethyl 2-bromomethyl-4-carbethoxyloxybenzyl-formamidomalonate (ⅩⅣ) by employing N-bromosuccinimide, whereas the bromination failed in the case of 1,3,4-isomer (ⅩⅢb). ⅩⅣ was then reacted with diethanolamine to afford Ⅺ. Compound ⅩⅨ can also be obtained via another route: ⅩⅥ was reduced by sodium borohydride in 95% ethanol containing 10% glycerine or by catalytic hydrogenation in the presence of Pd-C or Raney Ni to give diethyl 3-hydroxymethyl-4-hydroxybenzyl-formamidomalonate (ⅩⅪ). The latter was then first converted to diethyl 3-bromomethyl-4-hydroxybenzyl-formamidomalonate (ⅩⅫ) by passing dry hydrogen bromide into a solution of ⅩⅪ in glacial acetic acid and then by treating with diethanolamine in absolute alcohol to furnish ⅩⅨ. Compound ⅩⅩ can also be obtained from ⅩⅩⅣ, which was prepared through the Mannich reaction by condensing p-carbethoxyloxybenzyl chloride (ⅩⅩⅢ) with diethyl formamidomalonate in the presence of sodium ethoxide and paraformaldehyde in glacial acetic acid. Finally, the desired products (Ⅳ and Ⅴ) were obtained by hydrolysing Ⅻ and ⅩⅩ respectively with concentrated hydrochloric acid. Preliminary pharmacological examinations showed that compound Ⅳ (AT-786) was with similar toxicity as Ⅱb, but highly active against the Ehrlich ascites carcinoma in mice. Compound Ⅴ (AT-916) was also active against the same carcinoma.

1.从问-及邻-甲酚碳酸乙酯(Ⅵ)开始,分别柽七步反应,获得Ⅳ及Ⅴ。化合物Ⅳ(AT-786)及Ⅴ(AT-916)对小鼠艾氏腹水及大鼠Jensen肉瘤具明显抑制作用。 2.从3-醛基-4-羟基-氯苄(ⅩⅤ)开始,分别经七或六步反应,以及从对-乙氧羰氧基氯苄(ⅩⅩⅢ)开始,经三步反应,亦可获得Ⅴ。

An attempt was made to synthesize 2-acetylindole by the conventional Fischer's method from the diacetyl monophenylhydrazone using polyphosphoric acid (PPA) as a condensing agent but the product isolated was proved to be 3-acetylindole. In order to explore the possibility that the migration of the acetyl group from the 2- to the 3-position could take place after the indole formation, the desired 2-acetylindole, which was synthesized by catalytic reduction of the 2-diazo-acetoindole, was treated with PPA,...

An attempt was made to synthesize 2-acetylindole by the conventional Fischer's method from the diacetyl monophenylhydrazone using polyphosphoric acid (PPA) as a condensing agent but the product isolated was proved to be 3-acetylindole. In order to explore the possibility that the migration of the acetyl group from the 2- to the 3-position could take place after the indole formation, the desired 2-acetylindole, which was synthesized by catalytic reduction of the 2-diazo-acetoindole, was treated with PPA, and the expected 3-acetylindole was success fully obtained. The structure of the 2-acetyl compound was established by its infrared spectrum as well as its derivative formations. Although migration of an alkyl group in the indole ring with PPA as a condensing agent has previously been observed, the authors have not been aware of any migration of an acetyl group up to now. It is interesting to note in this connexion that Witkop and his coworkers have pointed out that "it seems probable that PPA will be useless for the preparation of a 2-unsubstituted indole".

企图用二乙酰单苯腙在多聚磷酸的作用下,按照Fischer的方法合成2-乙酰吲?,但产物不是2-乙酰吲?,而是3-乙酰吲?.为证明乙酰基的转位,用2-吲?重氮甲基酮催化氢化后所得产物经红外光谱、元素分析及定性方法证明为2-乙酰吲?.此产物与多聚磷酸一起加热后,所得产物证实与3-乙酰吲?是相同的化合物,因此乙酰基在多聚磷酸的作用下发生转位,由2-位转移到3-位.在多聚磷酸的作用下,乙酰基在吲?环上的转位现象,前人尚无报导.值得在此提出的是Witkop等认为不能用多聚磷酸作缩合剂合成2-位未被取代的吲?环.

Using mesitylene sulfonyl chloride (MS) as condensing agent, two protected hexadeoxyribonucleotides, d-_(MMTr)G_p~(Bz)A_p~(Bz)C_p~(An)G_p~(Bz)A_p~(Bz)G~(Bz) and d-_(MMTr)T_pC_p~(An)G_p~(Bz)A_p~(Bz)A_p~(Bz)C~(An), were synthesized. After removing the protecting groups, the nucleotide sequences determined by two dimensional homochromatography agreed well with the design, being d-GpApCpGpApG and d-TpCpGpApApC, respectively. Only solvent-extraction was used for the separation of the intermediate products of...

Using mesitylene sulfonyl chloride (MS) as condensing agent, two protected hexadeoxyribonucleotides, d-_(MMTr)G_p~(Bz)A_p~(Bz)C_p~(An)G_p~(Bz)A_p~(Bz)G~(Bz) and d-_(MMTr)T_pC_p~(An)G_p~(Bz)A_p~(Bz)A_p~(Bz)C~(An), were synthesized. After removing the protecting groups, the nucleotide sequences determined by two dimensional homochromatography agreed well with the design, being d-GpApCpGpApG and d-TpCpGpApApC, respectively. Only solvent-extraction was used for the separation of the intermediate products of protected oligonucleotides in every condensation step. The separation procedure was thus simplified and the separation time shortened to a large extent. This method is now adopted for the preparation of protected oligonucleotides on a large scale, irrespective of whether the trityl containing group is on the 5'- or the 3'-end (for example, in d-_pG_p~(Bz)A_(-ODMTr)~(Bz).

用均三甲基苯磺酰氯(MS)作缩合剂,合成了二个六脱氧核糖核苷酸(d-_(MMT_r)G~(Bz)_pA~(Bz)_pC~(An)_pG~(Bz)_pA~(Bz)_pG~(Bz)和d-(MMT_r)T_pC~(An)_pG~(Bz)_pA~(Bz)_pA~(Bz)_pC~(An)),脱去保护基后经双向同系层析测定核苷酸排列顺序,完全符合实验设计要求(d-GpApCpGpApG和d.TpCpGpApApC)。上述二个带保护基的六脱氧核糖核苷酸合成的每一步,都是采用溶剂抽提方法分离的,大大简化了分离的步骤和缩短了分离的时间,便于脱氧寡核苷酸的大量制备。此法也适用于其他带保护基寡核苷酸的制备,不论其三苯甲基衍生物基团在5’端或3’端(例如如d-_pG~(Bz)_pA~(Bz)_(-ODMT_r))。

 
<< 更多相关文摘    
图标索引 相关查询

 


 
CNKI小工具
在英文学术搜索中查有关condensing agent的内容
在知识搜索中查有关condensing agent的内容
在数字搜索中查有关condensing agent的内容
在概念知识元中查有关condensing agent的内容
在学术趋势中查有关condensing agent的内容
 
 

CNKI主页设CNKI翻译助手为主页 | 收藏CNKI翻译助手 | 广告服务 | 英文学术搜索
版权图标  2008 CNKI-中国知网
京ICP证040431号 互联网出版许可证 新出网证(京)字008号
北京市公安局海淀分局 备案号:110 1081725
版权图标 2008中国知网(cnki) 中国学术期刊(光盘版)电子杂志社