查询词典 dimethyl ether

The synthesis of monomethylhydrazine was investigated with dimethyl phosphite as methylating agent.

以亚磷酸二甲酯为甲基化试剂，一步合成了单取代的一甲基肼。

After MS interpretation, three decomposed products, trichloroacetaldehyde, dimethyl phosphite and dichlorvos were identified.

利用气相色谱-质谱联用技术对敌百虫在气相色谱分析过程中产生的分解产物进行定性研究。

The adsorption of dimethyl phthalate in the soil is studied,and the influence of some factors, such as pH value and ionic strength on the adsorption is investigated.

对邻苯二甲酸二甲酯在内蒙古粘土中的吸附特征进行了研究，并观察了pH值和离子强度等因素对吸附作用的影响。

The catalytic performance of hydrotalcite and pillared hydrotalcite with different anions were tested in transesterification of dimethyl carbonate with phenol.

测试了水滑石和不同org-LDHs对碳酸二甲酯与苯酚酯交换反应的催化性能。

In the synthesis process of ligands and their rare earth complexes, metal lithium is used to substitute for n-butyllithium, such as the synthesis of fluorenyl lithium, piperonal dimethyl acetal lithium, and bis (9-fluorenyl) silylene lithium.

合成配体和配合物的中间体均采用金属锂代替正丁基锂，如芴锂、溴代胡椒醛二甲基缩醛基锂盐、甲基苯基双芴基硅烷双锂盐的制备，方法简单，操作简便，副反应少，且锂盐的浓度和用量易于控制。

Under the protection of purified water-free, oxygen-free argon, using Schlenk technique, the rare rarth organometallic complexes containing piperonal dimethyl acetal and dicyclopentadienyl and involving silylene-bridged fluorenyl have been synthesized.

合成了含胡椒醛二甲基缩醛基和二茂基稀土金属有机配合物。采用Schlenk技术，在干燥纯氩气保护下进行。将溴代胡椒醛二甲基缩醛基锂盐与二茂基一氯稀土（Ln：Yb，Dy，Pr，La，Sm）反应，形成5个新的文献未曾报道的稀土金属有机配合物。

The main products 40,000 tons / year potassium carbonate, 60000 tons / year of potassium bicarbonate, 1,000 tons / year of 3,4 dichloroaniline, 6000 tons / year dimethyl sulfoxide, 2.5 thousand tons / year Xylitol, 1000 tons / year, such as high-purity hydrogen.

主要产品为4万吨/年碳酸钾，6万吨/年碳酸氢钾，1000吨/年3，4二氯苯胺，6000吨/年二甲基亚砜，2500吨/年木糖醇，1000吨/年高纯硫化氢等。

A commercial and practical synthesis rout with-2-(3-acetoxy-l-me-thyl-l~propenyl)-5,5-dimethyl-l,3-dioxane as starting material by couple,oxidation, Ramberg-Backlund and deprotection is chosen and studied in this paper.

本文选择了以2-(3-氯-1-甲基-1-丙烯)-5，5-二甲基-1，3-二噁烷为原料，经偶连、氧化、Ramberg-Bcklund反应及脱保护基四步反应的合成路线，对该中间体进行合成研究。

We prepared the pyrethric acid II through four reactions: esterification, oxidation, decomposition, diesterification. And the original synthesis route of the pyrethric acidII was improved: the yield of oxidation of allyl rise through increasing the activity of Selenium dioxide; in the document, tert-butyl-trans -2, 2-dimethy1-3-(2"-methoxycarbony1-1"-propenyl)cyclopropanecarboxy late was synthesized from tert-butyl-trans-2,2-dimethyl-3-(2 -formyl-r -propenyl) cyclopropanecarboxylate with two steps, with low yield.

我们经过酯化，氧化，成双酯，热分解四步反应，成功地得到了第二菊酸，并改进了原第二菊酸的合成路线：通过改变二氧化硒的活性提高了烯丙甲基的氧化产率；将原路线中醛氧化成羧酸、羧酸酯化的两步反应改为醛和甲醇、二氧化锰等作用一步直接酯化的方法，减少了反应步骤，提高了总收率。

Synthesis of dipropyl carbonatefrom dimethyl carbonateand propyl alcohol by transesterification was studied.

用丙醇和碳酸二甲酯液相酯交换合成碳酸二丙酯，筛选出催化性能和稳定性较好的KOH/Naβ固体碱催化剂，考察了KOH负载量对催化剂酯交换性能的影响。

The use of the web to spread fears that flicking the switch on the LHC could create a Black Hole that could swallow up the Earth particularly concerned him, he said.

他说，使用互联网散布恐慌说启动LHC会生成一个可能吞噬地球的黑洞的做法让他感到忧虑。

Not a single word have I written down.

我一个字也没有写下来。