查询词典 anhydrous

Organization: Institute of Chemical Engineering and Environment, Qingdao UniversityAbstract: A new Schiff base and its cupric complex of L-lysine and anisaldehyde were synthesized by stepwise synthesis method in anhydrous system, with basic essential amino acid L-lysine and natural product anisaldehyde as precursor.

摘 要：以碱性必需氨基酸L-赖氨酸和天然产物茴香醛为前体物，采用分步合成法在无水体系中制备了L-赖氨酸缩茴香醛单席夫碱及其铜配合物。

After saturating the aqueous layer with anhydrous potassium carbonate, the organic layer was removed and the aqueous layer was extracted with tetrahydrofuran 4 .times.

饱和后，水层无水碳酸钾，有机层被拆掉，水层提取四氢呋喃

After mixing benzonitrile with anhydrous ethanol, we have also measured their vibrational dephasing time.

并对苯甲腈与无水乙醇混合后的这三个振动模式的振动退相时间进行了测量，并得到了变化后的振动退相时间。

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。

"Camel mother said:"this is called the camelback, may help us to store up massive Shui He the nutrient, enables us to endure several day-long anhydrous non-food condition in the desert.

"骆驼妈妈说："这个叫驼峰，可以帮我们储存大量的水和养分，让我们能在沙漠里耐受十几天的无水无食条件。

Dehydrated ammonium carnallite (MgCl2·NH4Cl·nH2O, n=0.51) is obtained at 160 ℃ for 4 h, suitable for preparation of anhydrous magnesium chloride.

且铵光卤石于160 ℃脱水4 h可得到含结晶水为0.5~1的低水合铵光卤石，其可用作生产无水氯化镁的原料。

Ammonium carnallite ; gas-solid reaction ; anhydrous magnesium chloride ; preparation

铵光卤石；气固反应；无水氯化镁；制备

With the deepening of hydrophobic modification,the dispensability of modified starch in organic solvent liquid paraffin is markedly enhanced. The particle shape changes from rarefaction to cluster grape ball agglomeration state. The long chain group of methoxyl silane coupling agents KH570 is linked with the anhydrous glucose units of the cross-linked starch.

随着疏水化改性程度的加深，改性淀粉在液体石蜡有机介质中的分散性明显增强；颗粒形态由疏松态向串状葡萄球团聚态转变；在交联淀粉脱水葡萄糖单元羟基上引入了甲氧基硅烷偶联剂KH570的长链基团。

Ruixing is the registered trademark of our company, and the major products include Pyromellitic Dianhydride, Pyromellitic Acid, mesitylene, Durene, Aluminum Chloride Anhydrous, fluoro paints, melamine, green chrome oxide and metal chromium.

公司产品注册商标为"瑞星"牌，主导产品为：均苯四甲酸二酐、均苯四甲酸、均三甲苯、均四甲苯、无水三氯化铝、氟碳涂料、三聚氰胺、氧化铬绿和金属铬。

Target compounds have been synthesized by condensation of the aromatic nucleus and amino heterocylcle with acyl isocyanates or acylisothiocyanates in absolutely anhydrous and aprotic solvent.

为了寻找高活性的农药品种，利用生物等排原理和亚结构连接法，对脲类化合物的母体结构进行了修饰，将芳氧羧酸类及吡唑环引入酰基脲母体结构中，利用酰基异氰酸酯与杂芳环胺类化合物在无水非质子溶剂中发生亲核加成反应，合成了四个系列21种新的酰基脲类目标化合物。

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