查询词典 anhydrous

Four different power samples,sulfanilic acid anhydrous,soluble starch,graphite and calcium carbonate,with different content of carbon were used to determine the influence of element speciation on the properties of laser-induced spectroscopy.

对具有不同碳元素存在形态的4种化学纯试剂(无水对氨基苯磺酸、可溶性淀粉、石墨和碳酸钙)进行激光诱导击穿光谱实验。

Methods 4-Hydroxy- benzonitrile was treated with sodium hydrogen sulfide and anhydrous magnesium chloride in dimethyl formamide to give thioamide, which was then directly cyclized with ethyl 2-chloroacetoacetate without separation to give ethyl 2-(4-hydroxyphenyl)-4-methylthiazole-5-carboxylate(2) in one-pot; then 2 was formylated with Duff reaction adopting hexamethylenetetramine in trifluoroacetic acid to give ethyl 2-(3-formyl-4-hydroxyphenyl)-4-methylthiazole-5-carboxylate(3); finally, the target compound was obtained by the treatment of 3 with hydroxylamine hydrochloride and sodium formate in formic acid.

采用&一勺烩&方法，以4-羟基苯甲腈为起始原料，首先与硫氢化钠和无水氯化镁在N，N-二甲基甲酰胺中反应，所得中间体不经分离，直接加入2-氯乙酰乙酸乙酯进行环合反应，得到2-(4-羟基)苯基-4-甲基-5-噻唑甲酸乙酯（2）；然后通过六亚甲基四胺/三氟乙酸进行Duff反应，得到2-(3-甲酰基-4-羟基)苯基-4-甲基-5-噻唑甲酸乙酯（3）；再经盐酸羟胺/甲酸/甲酸钠体系脱水得到目标化合物。

Diethylthiophosphoryl chloride was synthesized by reacting phosphorus thiochloride with anhydrous alcohol in the presence of NaOH, and then a novel phosphorus-nitrogen- and sulfur-containing flame retardant, 1, 4-di(O,O-diethyl thiophosphoryl imine) benzene, was synthesized via the reaction of diethylthiophosphoryl chloride with p-phenylenediamine.

以三氯硫磷与无水乙醇在NaOH存在下合成了二乙基硫代磷酰氯，然后再与对苯二胺反应合成了新型的含磷、氮、硫的膨胀型阻燃剂：1，4-二（O，O-二乙基硫代磷酰亚胺基）苯。

Principle— The titrimetric determination of water is based upon the quantitative reaction of water with an anhydrous solution of sulfur dioxide and iodine in the presence of a buffer that reacts with hydrogen ions.

原理---水分滴定测定法是基于水与二氧化硫和碘的无水溶液，在能与氢离子反应的缓冲溶液下发生的定量反应。

The solubility of such a solvate may markedly differ from the nonsolvated form; eg, anhydrous ampicillin has a greater rate of dissolution and absorption than its corresponding trihydrate.

例如，无水氨苄西林的溶解速率和吸收比其它相应水合物的溶解吸收速率都要快得多。

The optimum conditions of synthesis were determined as follows:molar ratio of 2,4-di-t-amylphenol and anhydrous trimeric acetaldehyde 2∶1.2,amount of water 180 g,amount of emulsifier 0.5 g,and amount of catalyst 11.0 g at reacting temperature 80～83℃ for 5 h.

以2 ，4-二叔戊基苯酚、无水三聚乙醛为反应原料，采用含有表面活性剂、酸性催化剂的水作为反应溶剂，缩合反应合成2，2′-亚乙基双(4，6-二叔戊基苯酚)。

A new process for the preparation of 5-bromo-vanillin with vanillic aldehyde as raw material,AlBr3 as activator,HBr and H2O2 as brominating agent and anhydrous alcohol as solvent was developed in this paper.

摘 要：以甲基香兰素为原料，氢溴酸与过氧化氢为溴化剂，溴化铝为催化剂，无水乙醇为溶剂制备5-溴香兰素。

The solvents used were dewatered and deoxygenated and distilled out prior to use. Anhydrous LnCl3 was prepared by the method described in literature. The complexes were wa...

所有配合物经检测均具有旋光性，通过元素分析，IR，UV，热分析表征，可以证明所得配合物是我们所期望的产物，且未见报道。

The application results from fluorination showed microwave heating could accelerate chemical reactions markedly. The reaction time could be shortened 50% at least than that of conventional heating. The relationship between fluorinating agents\' structure and their activity was studied systematically. In addition, an anhydrous KF with higher activity was prepared by using expansion effect of microwave heating. As we known, solvents were very important to reaction. The comprehensive study showed some less polar aromatic solvents could be used as dipolar solvents. In addition, they had better effect than dipolar solvents in some occasions, such as fluorination of chlorobenzaldehydes and chlorinated diphenyl ketones etc. The primary applications of ionic liquids were also studied which indicated reactions with ionic liquids as solvents were more efficient and simple.

研究表明，微波是一种节能高效的加热方式，在微波作用下的卤素交换氟化反应具有反应速度快、转化率高、选择性好的优点，其反应时间可较常规加热缩短50%以上；同时也系统地研究了氟化剂种类及制备方式对其反应活性的影响，并利用微波加热的膨化作用制备出了一种活性较高的KF，其活性与喷雾干燥KF相差不大；溶剂对反应具有重要的作用，在此系统地研究了强极性非质子溶剂和中等极性非质子溶剂的应用情况，发现一些中等极性的非质子溶剂如硝基芳烃和氯代芳烃类溶剂在氯代苯甲醛类化合物的氟化反应中具有比强极性非质子溶剂更好的使用效果。

LiBOB was synthesized by an improved solid-state method. H2C2O42H2O was dehydrated to get anhydrous H2C2O4, and H2C2O42H2O was mortared with LiOHH2O. The mixture of H2C2O4 and LiOHH2O was preheated at 60 ℃ for 2 h before adding H3BO3 in several times to be mortared. In vacuum dryer, the mixture of the three starting materials was preheated in two steps: at 70 ℃ for 6 h and then at 100 ℃ for 3 h.

用改进的固相法合成一种新型电解质锂盐－双乙二酸硼酸锂：首先将脱去结晶水的H2C2O4与LiOHH2O研磨混匀，在60 ℃预热2 h后分批加入H3BO3，然后，于真空条件下在70 ℃和100 ℃分别保温6 h和3 h，得到LiBOB粗产品。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷