查询词典 samarium

The chapter two was focused on the samarium diiodide promoted organic reactions and their applications in organic synthesis, firstly, a new synthesis of highly substituted cyclopentadienes from a,β-alkynone promoted by samarium diiodide was investigated and the highly substituted cyclopentadienes were prepared in moderate to good yields under mild conditions. Secondly, the Michael addition and Michael-aldol tandem reaction of diorganyl diselenides or diorganyl disulfides with α,β-alkynones mediated by samarium diiodide were studied and a series of alkenylsulfides and alkenylselenides were prepared in good yields. Then the highly regioselecfive nucleophilic addition of the allylsamarium bromide to α,β-alkynones were explored. We found that the allylsamarium bromide reacts with α,β-alkynones to afford regiospecificly 1. 2-nucleophilic addition products in good yields under mild condition. At last we studied the coupling reaction of aryl halides promoted by NiCl〓/PPh〓/Sm〓.

第二章 研究了二碘化钐、金属钐促进的有机反应：1、二碘化钐促进下α，β-炔基酮的偶联环化反应，提供了一种制备多取代环戊二烯的新方法；2、二碘化钐促进下的二硫醚、二硒醚与α，β-炔基酮的Michael加成反应，为高产率地制备多取代的烯基硫或烯基硒化合物提供了方便可靠的新方法；3、二碘化钐促进下的二硫醚、二硒醚与α，β-炔基酮和醛、酮的Michael—aldol串联反应，提供了一种一锅法高产率地制备多取代的含硫的烯丙基醇或含硒的烯丙基醇类化合物的方便可靠的原子经济性的新方法；4、烯丙基溴化钐与α，β-炔基酮的高度区域选择性的1，2-亲核加成反应；5、NiCl〓/PPh〓/Sm〓促进的卤代芳烃的偶联反应-一种从各种卤代芳烃制备联苯类化合物的有效方法。

Methods Samarium nitrate was administrated to mice at different doses (0,5,50,500,2000mg/L) for 90d.The contents of samarium and trace elements in testicle were observed.

110只雄性ICR分为5组，小鼠分别自由饮用0，5，50，500和2 000mg/L的硝酸钐水溶液90d，测定睾丸内钐和微量元素含量的变化。

Samarium Cobalt, Alnico mainly used in instruments and meters, electrical as well as some of the work environment has special requirements for mechanical equipment.

钐钴，铝镍钴主要用于仪器仪表，电机以及一些对工作环境有特殊要求的机械设备上。

The company mainly produces NdFeB, ferrite, rubber and magnetic, Samarium Cobalt, Alnico and a variety of magnetic products.

公司主要生产钕铁硼，铁氧体，橡塑磁，钐钴，铝镍钴以及各类磁性制品。

Our company long-term production and marketing of a variety of specifications and performance NdFeB, ferrite, magnetic rubber, magnetic button and Samarium Cobalt, Alnico, magnetic tile magnetic materials and other products, widely used in aerospace, electronics and electrical, plastic hardware, handicrafts, machinery and other related industries.

我公司长年生产销售各种规格以及性能的钕铁硼、铁氧体，橡胶磁、磁钮及钐钴、铝镍钴、磁瓦等各种磁性材料产品，广泛应用于航空航天领域、电子以及电机、塑胶五金、工艺品、机械等相关行业。

The aim of this thesis researches and develops a novel approach of carbene promoted by samarium and its application in organic synthesis.

本论文的研究目的在于寻找和探索钐试剂促进卡宾的新方法及其在有机合成中应用。

The study of this thesis enlarges the application of rare earths metal- samarium in organic synthesis that has quite important meaning for our country having abundant rare earths resources. It promotes to explore the new use of rare earths metals in organic synthesis. There will be a great break in the theory and application of the production of carbene.

通过本研究扩大了稀土金属钐在有机合成中的应用范围，这对于我国具有丰富的稀土资源(贮量占世界总贮量的85%以上，稀土金属产量及质量占世界首位)而言，促进开发稀土金属在有机合成中的新用途，具有十分重要的意义；并在产生卡宾的理论上有所突破，填补了卡宾研究领域的空白，取得一些极具价值的学术成果。

Application of samarium diiodide in mediating intramolecular cyclization reactions was reviewed.

综述了二碘化钐在分子内环化反应中的应用。

The deoxygenation and reduction of some organic substrates with samarium diiodide were investigated.

本文研究了二碘化钐对一些有机化合物的脱氧反应，以及它在醇存在下对α-卤代酮、偶氮苯和苯醌的还原反应。

The laser induced fluorescence and its derivative spectra of dysprosium europium, samarium, and terbium in the system of TFATOPO-Nongru-100 was studied and the method for the simultaneous determination of the four rare earths was developed.

我们利用自己编写的数字微分软件，研究了TFA-TOPO-农乳-100体系中Dt、Eu、Sm和Tb的激光诱导荧光及其导数荧光光谱，拟定了同时测定四个稀土元素的分析方法。

You realize that when you think of him or her, you can't help laughing.

你意识到当你看着他/她的时候，你总是在笑

I'm playing the part of Ophelia.

我演的是奥菲莉娅。