查询词典 synthesis

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。

As carbene has its particular reactive capability and enormous applied value, it is one of focus hotspots by researchers all along and it is an important task in organic synthesis.

卡宾由于其独特的反应性能和巨大的应用价值，一直是人们竟相关注的热点之一，也是有机合成方法学中的重要课题。

This thesis is mainly about the research on the synthesis, structures and reactivity of di-or tri-metal bridging carbene and bridging carbyne complexes

过渡金属桥卡宾和桥卡拜络合物本身即为简单的金属原子簇化合物或是合成金属原子簇化合物的重要前体，在有机合成和烯炔烃的聚合和异构化等催化反应中有广阔的应用前景以及在某些过渡金属参与的反应的机理研究中具有重要的研究价值。

In recent years, with the development of various good catalysts especially the ruthenium alkylidenes bearing N-heterocyclic carbene ligands, the RCM reaction has been applied widely in the synthesis of complex organic molecules, biological molecules and natural products etc. The Nobel Prize in Chemistry 2005 goes to Yves Chauvin, Robert H.

近二，三十年来，随着各种性能优良的催化剂的不断发展，尤其是含氮杂环卡宾配体的钌催化剂的出现，关环复分解反应在合成复杂有机分子，生物活性大分子以及天然产物等方面已得到了极为广泛的应用。2005 年的诺贝尔化学奖分别授予了 Yves Chauvin，Robert H。

The new structure compounds (4, 54, 56) possessing vasodilatation were found. These compounds may be as lead compounds of developing antihypertension drugs. The synthesis method of peptidemimetics containing β-tetrahydro -carbolic acid was established for the first time.

在对上述化合物NO清除能力评价实验中，发现了一类具有舒血管活性新化合物（化合物4，54，56），这一类具有舒血管活性化合物的发现可以为研制高血压治疗药物提供先导化合物。

Synthesis of p-nitro-ethylbenzoate catalyzed by p-toluenesulfonic acid supported on granule activated carbon was studied.

研究了用颗粒状活性炭固载对甲苯磺酸作催化剂合成对硝基苯甲酸乙酯。

In this paper,the catalysis and mechanism of ionic liquids for direct synthesis of dimethyl carbonate is studied.

考察了多种离子液体对直接合成碳酸二甲酯反应的促进作用，并对机理作了分析。

It was pointed out that such problems as high recycling water temperature, bad cooling effect in methanol synthesis, high carbonizer temperature and incomplete absorption of ammonia, etc., existed in the conventional process.

分别介绍了天九化工有限公司合成氨生产装置冷却系统改造前后的工艺流程，指出原工艺流程存在循环水温度高、甲醇合成冷却效果差、碳化塔温度高、氨吸收不完全等问题。

By installing cooling tower in the methanol synthesis section, changing the ammonia absorption plant from once into twice, and changing the flow path of cooling water in carbonizer, the new process overcame disadvantages existing in the former process.

新工艺通过在甲醇合成工段安装冷却塔、将一次吸氨装置改成二次吸氨装置、改变碳化塔冷却水流程等措施，克服了原工艺流程存在的缺点，并且生产1 t氨的煤耗降低252 kg，电耗降低182 kW·h，成本降低180元。

Abstract; The temperature of carbonyl synthesis reaction is studied.

对拨基合成反应的温度进行了研究。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失