氢化

The basic functionalized ionic liquid, 1-butyl-3-methylimidazolium hydroxide, was prepared and used to catalyze the Knoevenagel condensation of aromatic aldehydes with malononitrile or ethyl cyanoacetate.

合成了碱性功能化离子液体氢氧化1-丁基-3-甲基咪唑，研究了将其作为催化剂催化芳香醛和丙二氰、氰基乙酸乙酯的Knoevenagel缩合反应。

It could be synthesized by a key intermediate 2-pentylidene cyclopentanone formed a condensation starting from cyclopentanone and n-valeraldehyde, followed by isomerization, Michael addition and a selective decarboxylation.

本文研究了以正戊醛和环戊酮为基本原料，经缩合反应、异构化反应、Michael加成反应和脱羧反应等制备二氢茉莉酮酸甲酯的化学合成方法和工艺。

Benzyl bromide was synthesized from dibenzyl ether and hydrobromic acid with SO42-/ TiO2 as catalyst and cyclohexane as dehydrant.

以二苄醚和氢溴酸为原料，SO42-/TiO2为催化剂，环已烷为带水剂，合成了溴化苄。

The reaction barrier will be lowered by the substituents that delocalize the unpair electron in p z orbital of the central carbon atom.

R1和R2位置上取代基对α-氢转移反应势垒的影响取决于取代基对过渡态中碳原子的未参与sp2杂化的p z 轨道上单电子的离域作用。

AIM: Using a new laser fluorescence device - the KaVo DIAGNOdent,we studied the occlusive effects of mixed solution of NaHCO 3 and NaF on dentinal tubules.

目的 ：用激光荧光仪定量研究碳酸氢钠和氟化钠混合液对牙本质小管的堵塞作用。

The reaction mechanism for the formation of ultimate carcinogens diazohydroxide, diazonium and oxoniumions by α-hydroxylation-NPYR and the alkylation process of C and guanine were investigated including solvent effects at the B3LYP/6-31G(superscript **) level.

采用密度泛函理论，在B3LYP/6-31G水平上，研究了气相和水溶剂中，α-羟基化吡咯烷亚硝胺(-αhydroxylation-NPYR， A)代谢为终致癌物重氮氢氧化物、重氮烷阳离子和氧离子，以及C与鸟嘌呤碱基相互作用的反应机理。

The reactive model of SiO2 in production of feed-grade dicalcium phosphate, and the effect of pH on the process of gelification of silica gel are discussed, also the distribution and form of SiO2 is studied and ultimately the elimination methods of SiO2 is given.

论述SiO2在饲料级磷酸氢钙生产中的反应模式，pH对硅胶凝胶化过程的影响。研究SiO2的分布及形态，提出了生产中SiO2的消除方法。

The reactive model of SiO 2 in production of feedgrade dicalcium phosphate , and the effect of pH on the process of gelification of silica gel are discussed, also the distribution and form of SiO 2 is studied and ultimately the elimination methods of SiO 2 is given.

论述 Si O2 在饲料级磷酸氢钙生产中的反应模式，p H对硅胶凝胶化过程的影响。

CO is used to produce formate,formic acid and oxalic acid by reacting with alkaline,in which the CO usually from coal vaporization is replaced by the CO from tail gas of yellow phosphorus production,by-reaction between thermal phosphoric acid and formate or oxalate to produce formic acid or oxalic acid,and by product dihydric phosphates.

提出用生产黄磷尾气中的CO与碱反应生产甲酸盐甲酸草酸，或利用热法磷酸和甲草酸盐反应生产甲酸草酸并副产磷酸二氢盐，继续加工可制得磷酸盐系列和碳一化工系列产品分析该磷化-碳一化工产业在节能减排降低投资与生产成本方面的优势，并简述了黄磷尾气杂质对产品质量的影响及尾气的净化方法

Nitroarenes can be reduced by samarium diiodide to afford a nitrogen anion,which is a living species and can be acylated by relatively weaker acylating ester agents.

二碘化钐(SmI2)在四氢呋喃溶剂中还原硝基化合物，可以生成氮负离子中间体，该中间体具有较高的反应活性。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。