查询词典 pyridine

Using benzyl phosphorus and pyridine phosphorus ligands, a series of complexes were synthesized and their structures were also discussed.

使用苯基膦酸以及吡啶膦酸配体合成了一系列链状和层状配合物，并对它们的结构进行了研究。

A new method for determination of caffeic acid was presented based on cetyl pyridine bromide modified carbon paste electrode.

制作了溴代十六烷基吡啶修饰碳糊电极，研究了咖啡酸在该修饰碳糊电极上的电化学行为。

The experimental results indicated that the two N-heterocyclic carbene palladium complexes with coordination of pyridine could catalyze the coupling of bromobenze and gave yield of 80%.

结果表明，这两个含吡啶配位的N-杂环卡宾钯络合物，对溴苯与丙二腈的交叉偶联，产率可达80％。

Remedial group is in ammonia of armour of weekly profess to convinced butterfly Ling15mg foundation applies Yinaxipu, every periderm chip in is shot 2 times, every time 25mg; contrasts the MTX of same dose applies group profess to convinced jointly medicine of other change illness , pyridine of sulphanilamide of the nitrogen that be like willow or come fluorine rice is special.

治疗组在每周口服甲氨蝶呤15mg基础上联合应用依那西普，每周皮下注射2次，每次25mg；对照组口服相同剂量的MTX联合应用其他改变病情药，如柳氮磺胺吡啶或来氟米特。

The process of 2-chloropyridine chlorination synthesis by pyridine and application were introduced.

介绍了吡啶氯化合成2-氯吡啶的方法和应用。

Other than conventional concept, the N→Rh bond, formed by rhodium in the complex and nitrogen at pyridine ring in the ligand, did not break in the course of the carbonylation reaction, but formed into new active species instead, i.e., the ligand and rhodium as a whole participated in the oxidative addition of CH3I and the formation of CH3COI.

配合物中铑与吡啶环上共轭N形成的N→Rh配键，在羰基化反应过程中并非通常认为的断裂而是形成新的活性物种，即配体与铑作为整体参与了CH3I的氧化加成及CH3COI的生成过程。

The results indicate that the weak election-withdrawing group 4-hydroxymethyl in 4-position of pyridine in 4-HMDPA could weaken the fluorescence intensity of the lanthanide complexes. The contradistinctive experimental results show that the fluorescence intensities of these complexes are related to pH value of the aqueous solution and the dipole moment of solvent molecule: in the neutral aqueous solution,the fluorescence intensities of these complexes were strongest,while the less the dipole moment was,the stronger the fluorescence intensity was.

结果表明，在吡啶4位引入弱吸电子基团4-羟甲基会减弱稀土配合物的荧光强度；在水溶液中稀土配合物与溶液的pH值有着密切的关联，中性水溶液中荧光强度较大；分子偶极矩较小的溶剂中稀土配合物荧光强度较强。

Employing dealkylation of cumene as the controlling reaction, the authors investigated the poisoning action of pyridine on a silica-alumina catalyst.

本文以异丙基苯的裂化作为控制反应，用动力学方法考察了硅铝催化剂为吡啶中毒的情况。

The yields of the reactions in the presence of DCC and DMAP were higher than those in DCC and pyridine.

在DCC/DMAP体系中的反应产率大于在DCC/吡啶中的产率。

The cis novel bisoxazoline ligands L1-L4 have been synthesized through the treatment of new cis dihydroxy diamide with p-toluenesulfonyl chloride in the presence of catalytic quantity of 4--pyridine, and the cis dihydroxy diamide could be achieved from the condensation of the amino alcohols and cis cyclopropane dicarbonyl chloride prepared via oxidation and halogenation from cis-2,2-dimethyl-3-formylcyclopropanecarboxylate with DCC.

我们以蒈醛酸内酯为起始原料，经过氧化反应、酰氯化反应得到顺式环丙烷二酰氯，然后在二环己基碳二亚胺的催化下与相应的氨基醇反应合成了顺式二羟基酰胺，再用对甲苯磺酰氯将羟基活化，最后在二甲氨基吡啶的催化下关环合成顺式双噁唑啉配体L1～L4。

Fancy gold-plated dangling earrings with facetted White Opal crystals.

花式镀金悬垂耳环与facetted白欧泊水晶。

This essay chooses the study aim from biology teachers in middle school in Shi Jiazhuang which tells us that most of the middle school biology teachers in Shi Jiazhuang have the"burnout", lower successfulness, individualize.

本文选取石家庄市初中生物教师作为研究对象，运用问卷调查的方法对石家庄市初中生物教师职业倦怠的现状进行调查，调查结果发现，石家庄市初中生物教师这一群体普遍存在职业倦怠，情感枯竭程度偏高，成就感偏低，去个性化程度最为严重。