查询词典 formate

The effect of different reaction conditions,such as catalyst concentration,molar ratio of reactants,reaction temperature,reaction time,on the coupling reaction of trioxane and methyl formate synthesizing methyl glycolate and methyl methoxy acetate using sulfuric acid as catalyst has been studied.Through the analysis for the yield of products and system pressure,and comparison with other different acidity catalysts,we considered that the activation of formaldehyde was the control step of reaction rate to the...

以硫酸为催化剂，研究了三聚甲醛与甲酸甲酯偶联合成乙醇酸甲酯和甲氧基乙酸甲酯的反应中，催化剂浓度、原料配比、反应温度、反应时间等条件对反应过程的影响，通过对产物收率和系统压力变化的分析，并结合与其它不同酸强度催化剂的对比，得到甲醛的活化是偶联反应的速率控制步骤，催化剂的酸强度决定其对甲醛的活化能力，是影响偶联反应的主要因素。

Acid catalyst and H + catalysis in the acid catalysts were studied for synthesis of methyl glycolate via coupling of methyl formate and trioxane in a microform high-pressure autoclave(120mL).

在微型高压反应釜中(12 0ml)，考察了酸催化三聚甲醛和甲酸甲酯制备羟基乙酸甲酯的偶联反应，并对酸催化剂中H+的作用进行了研究。

The sythesis of methyl glycolate by methyl formate coupled with triformaldehyde with the catalyst of superphosphoric acid is exploring researched in this thesis. The point of exertion is the capacity of the new catalysts.

本研究主要对以过磷酸为催化剂催化甲酸甲酯与三聚甲醛偶联合成乙醇酸甲酯进行考查，通过对以过磷酸、浓硫酸及过磷酸与浓硫酸混合酸催化剂时反应现象、乙醇酸甲酯产率等的对比，研究以过磷酸为催化剂偶联合成乙醇酸甲酯反应的催化活性。

PH of filtrate is kept below 0.65 in order to avoid the reaction between sodium formate and iodine bromide. Then iodine bromide halogenation method is used to determine quantitatively the content of the third monomer, i.

控制滤液pH在0.65以下，以防止甲酸钠和溴化碘起反应，然后用溴化碘卤化法定量测定滤液中的第三单体甲基丙烯磺酸钠的含量。

The carbonylation of methanol, hydrogenolysis of methyl formate and concurrent methanol synthesis are analyzed with gas phase thermodynamics data.

首先求出了三个反应在不同温度下的平衡常数。

Under syngas or pure H2, methyl formate hydrogenolysis was carried out over ultrafine CuO－BaO／SiO2 catalysts with various copper content,which had been previously investigated by TEM,BET and TPR techniques.

研究了在合成气或纯氢气气氛下CuO－BaO／SiO2催化剂甲酸甲酯氢解反应活性的变化，并对催化剂进行了TPR、TEM和BET表征。

Formate it in the route in dozens of existing, only the synthetic routes with thiamphnicol,intermediate, by-products have industrialized value.

在现有的几十条合成路线中，只有以甲砜霉素及其中间体、副产物的合成路线有工业化价值。

The catalysts were prepared by impregnation and precipitation method, and the active carbon,γ-Al2O3, silica and kieselguhr were selected as the carriers of catalyst. the effects of reaction conditions, such as reaction temperature, types of solvents, and types of hydrogen donors were investigated, It was found that the Pd/C catalyst was the best one, and its proper reaction conditions were also obtained as follow: sodium formate as hydrogen donor, water as solvent, reaction temperature of 70℃ and reaction time of 2.5h.

以活性炭、γ-Al2O3、硅胶和硅藻土等为载体，分别采用浸渍法和沉淀法制备了催化剂，对于反应温度、溶剂及氢供体的种类等反应条件的影响进行了研究，发现以沉淀法制备的Pd/C催化剂是对转移加氢最有效的催化剂，初步确定了适宜的反应条件为以甲酸钠作氢供体、水作溶剂及70℃反应2.5h等。

Goal compound synthesis namely: Take the vanillic acid as outset raw material, obtains 4- hydroxyl - 3- anisole methyl formate with the methyl alcohol reflux conditions, then after the etherification, the nitration, the return to original state, the ring closure response obtains 6- methoxy - 7- animal pen oxygen radical kui zuo lin - 4- alkone, then passes through the chlorination, the substitution aniline, to escape responses again and so on animal pen oxygen radical, etherification to obtain the goal compound; The goal compound and the diethylamine had the amine substitution reaction to obtain TM1, namely 4- benzene amino - 6- methoxy - 7- [2- hydroxyl - 3-(N, N- two ethyl aminos) third oxygen radical] kui zuo lin; Through zuo has the etherification with the Austria niter to respond obtains TM2, namely 4- benzene amino - 6- methoxy - 7- [2- hydroxyl - 3-(2- methyl - 5- nitryl imidazole) third oxygen radical] kui zuo lin.

目标化合物的合成即：以香草酸为起始原料，与甲醇回流条件下得到4-羟基-3-甲氧基苯甲酸甲酯，然后经过醚化、硝化、还原、环合反应得到6-甲氧基-7-苄氧基喹唑啉-4-酮，然后再经氯化、取代苯胺、脱苄氧基、醚化等反应得到目标化合物；目标化合物与二乙胺发生胺取代反应得到了TM1，即4-苯氨基-6-甲氧基-7-[2-羟基-3-丙氧基]喹唑啉；通过与奥硝唑发生醚化反应得到TM2，即4-苯氨基-6-甲氧基-7-[2-羟基-3-(2-甲基-5-硝基咪唑)丙氧基]喹唑啉。

Hordenine propyl formate and chemical osmosis are the two ways of extracting Glutathione from yeast have been introduced and compared in this review.

介绍了从酵母中分离纯化谷胱甘肽的两种抽提方法：对羟基苯甲酸丙酯法和化学渗透法，并对其进行了对比。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。