查询词典 acetic

The process of esterification of propylene glycol monomethyl ether with acetic acid to synthesize propylene glycol monomethyl ether acetate is investigated using 98% sulfuric acid as catalyst.

研究了以浓硫酸为催化剂，丙二醇甲醚和醋酸酯化合成丙二醇甲醚醋酸酯的过程，考察了醚和酸比例、催化剂用量等因素对反应的影响，并选择甲苯为水萃取剂。

The optimum reaction conditions were: at present of acetic anhydride, a stoichiometric quantity of nitric acid, at room temperature for 40 minutes. Nitration of chlorobenzene gave a,50% yield of mononitro compounds, and an ortho-para isomer ratio 0.20 in product distribution of chlorobenzene mononitration.

结果表明：硅钨酸催化性能较好，催化剂载体以纳米二氧化硅最好，反应条件中醋酸酐用量是主要影响因素；SiW_(12)O_(40)~(4-)／纳米SiO_2催化剂具有强对位选择性：在醋酸酐存在下，氯苯与等当量的硝酸室温下反应40分钟，氯苯一硝化产物中邻／对硝基氯苯异构体的质量比达0.2，产率可达50％。

and discussion The research results indicate that WCL has a function of resisting ulcer and accelerating healing of ulcer and it is safe to use in clinic. WCL is helpful for preventing gastric ulcer of different causes, including muriatic acid-ethanol ulcer, pylorus ligated ulcer, cold-restraint-stress ulcer, and chronic acetic acid ulcer.

胃肠乐对不同机制形成的多种溃疡：盐酸-乙醇溃疡、幽门结扎溃疡、冷束缚应激溃疡、乙酸慢性溃疡均有良好的防治作用，尤其对盐酸—乙醇、应激性溃疡作用优于洛赛克，对乙酸慢性溃疡的防治和溃疡愈合质量效果明显。

The nitration of toluene was carried out in the presence of acetic anhydride with CCl4 as solvent, 95% nitric acid as nitrating reagent, and niobic acid calcinated at 300℃ for 3 h as catalyst for 60 min at 40℃.

实验结果表明，当反应温度为40℃，反应时间为60min时，以CCl4为溶剂，以质量分数为95%的硝酸为硝化剂，在醋酐存在条件下，以经300℃焙烧3h后的铌酸作为催化剂，甲苯硝化产物中异构体的邻对比达1.26，较硝硫混酸的1.67显著降低，产物得率达99.3%。

The effects of all kinds of factors, just like calcination temperature of niobic acid catalysts, nitration reaction time, nitration reaction temperature, recovered catalyst, acetic anhydride and concentration of nitric acid were studied by gas chromatography.

研究了催化剂焙烧温度、硝化反应时间、硝化反应温度、有无醋酸存在、硝酸浓度、催化剂的重复使用等因素对甲苯硝化反应影响。

Substituted-2-aminobenthiazoles were dissolved in a mixture of acetic acid,phosphoric acid and propionic acid, and diazotized by nitrosylsulphuric acid, then coupled with m-dimethylaminobenzoicacid to form 6-R-BTAMB in good yield.

我们在2-氨基苯并噻唑的6-位引入了不同的取代基R，合成了6种新试剂，2-I2'-(6'-R-苯并噻唑)偶氮-5-二甲氨基苯甲酸(6-R-BTAMB，R=〓，〓，Cl，Br，〓，〓，)，并研究了6-R-BTAMB与Fe、Co、Ni、Cu和Pd的络合显色反应的光度性能及不同R基团对试剂灵敏度及选择性的影响将6-〓-BTAMB应用于测定铝合金，电镀废液中的铜，人体毛发和矿泉水中铁的含量均取得了满意的结果。

The possible mechanism was discussed. These bowl-shaped aggregates are promising candidates for nano reactor or drug carrier.4 2,7-dimethylene-1,4,6-trioxaspiro[4, 4]nonane with two vinyls was prepared to be used as electron-donor and crosslinker. The ATRP of this crosslinker and excess methylacrylate (used as electron-accpetor) was proved to mainly form homopolymers. With the chain-transfer agent S-1-Dodecyl-S\'-(α,α\'-dimethyl-α-acetic acid)trithiocarbonate, the copolymerization of the spiro hydrocarbon, maleic anhydride and MA by RAFT method produced star PMA.

这些由聚电解质复合物自组装形成的聚集体，在微反应器和药物释放等领域具有潜在的应用前景。4合成了双乙烯基的2，7-二亚甲基-1，4，6-三氧杂螺环烷，作为给电子单体和交联剂，与吸电子单体马来酸酐或过量的丙烯酸甲酯形成电荷转移络合物共同聚合，尝试了用ATRP和RAFT方法一步法合成星形聚合物。

Thus, equal-molecular acetic acid and n - butanol was refluxed in perfluorous nonene at 80 ℃ for 1.5 h,and the average yield of 5 runs was 98.5%.

反应物料后处理简单，氟溶剂和催化剂硫酸回收方便，可直接套用。

This thiosemicarbazide was treated under the catalysis of glacier acetic acid,mercuric acetate giving 2 benzyl 5 phenylamino 1,3,4 thiodiazole and 2 benzyl 5 phenylamino 1,3,4 oxadiazole respectively.

然后分别将其在冰醋酸、醋酸汞存在下关环，制得 2 苯甲基 5 苯胺基 1，3 ，4 噻二唑与 2 苯甲基 5 苯胺基 1，3 ，4 口恶二唑

In a DMF solution of CuCl〓-ethanolamine-acetic acid (1: 2: 2), 27 formed a highly oxidized heterocyclic compound 2-hydroxymethyl-naphtho [1, 2-a] oxazole (30) by the carbon-nitrogen coupling and carbon-oxygen coupling with the ligand of ethanolamine, which brings a chance to develop a novel approach to this heterocyclic compound via one-pot reaction of phenols under mild condition.

在氯化铜—乙醇胺—乙酸（1：2：2）的DMF溶液中，27与配体乙醇胺发生碳氮偶合与碳氧偶合，生成深度氧化的杂环化合物：2-羟甲基-萘并[1，2-a]〓唑（30）。这可望为酚类一锅化直接转化为30及其类似物提供一种简便的新合成路线。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。