查询词典 reagents

Organozinc reagents are an important type of organometallics in organic synthesis, which can undergo transformation with a variety of transition metal salts leading to new transition metal compounds.

有机锌试剂是一类优良的有机金属试剂，由于反应活性较低，很多活性官能团都可以存在于这类金属试剂中。

Organozinc reagents are an important type of organometallics in organic synthesis, which can undergo transformation with a variety of transition metal salts leading to new transition metal compounds.

中文摘要：有机锌试剂是一类优良的有机金属试剂，由于反应活性较低，很多活性官能团都可以存在于这类金属试剂中。

Meantime, we further studied this reaction under microwave irradiation conditions and first introduced the concept of the solvent-free and no-catalyst in this reaction, expanded the olefination of organozinc halides reagents with aldehydes, enlarged the application scopes of this reaction.

同时在微波辐射条件下进一步研究了该类反应，并在该类反应中初步引进无溶剂、非催化的概念，扩展和完善了有机卤化锌试剂与醛的烯基化反应，扩大了其应用范围。

The transfer of R group from XZnR occurrs from the same face as the oxygen of epoxide and results in a syn addition since organozinc reagents XZnR could act as a Lewis acid system as well as being nucleophilic in character.

我们制备一类新型有机锌试剂，研究它们在适宜的反应条件下，直接对环氧化合物进行开环反应，得到顺式开环产物，实现了有机金属试剂的立体选择性顺式开环。

The reaction of cyclic b-keto esters with CF3CO2ZnCH2I provides the corresponding ring-expanded products with the advantage of mild condition in moderate to good yields. A simple and efficient procedure has been developed for a variety of 1,3-diketones converted into the corresponding 1,4-diketones and trans-1,2-disubstituted cyclopropanols in high yields. In conclusion, this new type of organozinc reagents has been developed for many useful reaction in organic synthesis.

利用有机锌试剂所具有的双重特性，在新型的Baylis-Hillman反应中，可以直接与炔基酮和醛反应一锅制得多官能团的三取代的顺式烯；在b-酮酯化合物的扩环反应中，取得了重要进展，得到了增加一个碳的扩环产物，&一步法&合成，反应条件温和、环境友好；在1，3-二酮分子中成功地插入1个碳，合成出1，4-二酮和环丙醇，为现代有机合成提供了新的合成方法，具有良好的应用前景。

Keywords: Organozinc reagents; cis-Addition Products; Ring-expansion; Chain-extension

中文关键词：有机锌试剂；环氧的顺式开环；酮酯的扩环；碳链增长

These salts can beprepared on treatment of phosphinimines with trifluoroaceticanhydride. After addition-elimination, triflromethylated β-enaminoesters and β-iminoesters were synthesized by thereaction of the above salts with organozinc reagents.

通过膦亚胺和三氟乙酸酐反应制备了N-三氟乙酰基氨基膦盐，该膦盐和锌试剂发生加成-消除反应后，合成了含有三氟甲基的β-烯胺酯和β-亚胺酯。

Organozinc reagents; cis-Addition Products; Ring-expansion; Chain-extension

中文主题词：有机锌试剂；环氧的顺式开环；酮酯的扩环；碳链增长

Sera were collected from 119 parous cows. After screening and testing these sera with cell panel, a total of 6 kind reagents against BoLA A2, A6, A8/14, A10, A11 and A30 were typed from 16 alloantisera. The titer of antisera ranged from 2x to 8x. Besides these 16 sera, another serum which seemed to be against subtype of A30 was also obtained.

第一种方法系采集经产母牛之血清经比对测试后，筛选出具特异性抗体之血清；以此方法共筛选 119 头经产母牛之血清，而制得 6 种标准抗血清计 16 支，分别对抗 BoLA A2、A6、A8/14、A10、A11、A30 等抗原型，此外尚制得 1 支为疑似对抗 A30 之亚型之抗血清；所得抗体力价偏低，介於 2～8 倍间。

Multiplex-PCR detection method for Pasteurella multocida and Haemophilus parasuis had been developed based on published single PCR for these pathogens. The PCR reagents, annealing temperature and the PCR procedure were optimized and the primers were screened, the PCR products including 457bp of PM and 1090bp of HPS were obtained just by one test.

在已经建立的多杀性巴氏杆菌、副猪嗜血杆菌的单项PCR诊断方法的基础上，通过对扩增条件和引物的筛选，成功地建立了PM、HPS复合PCR诊断方法，利用一次PCR反应，即可同时扩增多杀性巴氏杆菌的457 bp和副猪嗜血杆菌的1090 bp的特异性片段。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。