查询词典 phosphines

The synthesis of handedness phosphines is gone on continually.

合成手性膦化合物的研究工作仍在进行中。

The traceless Staudinger ligation of azides and phosphines is an effective method to produce an amide bond.

叠氮化合物和膦硫酯的无痕施陶丁格连接反应是一种有效生成酰胺键的方法。

In the same time, water-soluble bidental phosphines ligand BISBIS sulfonated 2,2''-bis(diphenylphosphinomethyl-1,1''-biphenyl was synthesized, and water-soluble rhodium complex Cl was synthesized in situ. This complex which was used as catalysts to catalyze the hydrogenation of avermectin was also tested. Although the rhodium complex containing bidentate phosphine BISBIS showed a higher catalytic activity than one containing TPPDS, the selectivity for ivermectin was lower. How to improve the selectivity will be needed to studied in futur.

同时我们用磺化的2，2''-二-- 1，1''--联苯，以及它们的水溶性威尔金森型铑配合物和环辛二烯的阳离子铑配合物，在利用这些配合物作催化剂，考察它们在各种反应条件下对阿维菌素的选择加氢，由于反应条件以及复合催化剂体系的组成还需要进一步优化，虽然双齿膦配合物显示了较高的活性，然而选择性还有待进一步提高。

Water solubility experimental showed that thesolubility of phosphines in water only containing phosphonic acid group was0.16～0.29 g/mL; After introduction of ethoxylated group, the solubility ofphosphines in water was significantly improved.

水溶性实验表明，仅含膦酸根的膦配体在水中溶解度约为0.16～0.29 g／mL；引入乙氧基后，膦配体的水溶性有明显的改善。

This PhD thesis mainly summarizes the original results on studies of aromatic amide-derived phosphines,including the precatalyst system consisting of Aphos and Pd_2 and the applications for promoting room temperature Suzuki cross-coupling of aryl chlorides and aryl/vinyl bromides,respectively,with aryl/vinyl boronic acids,and alkyl boranes.

本博士学位论文主要总结了对芳基酰胺衍生的膦配体的研究，以及该类型配体与Pd_2组成的催化剂在室温下催化氯代芳烃、溴代芳烃、溴代烯烃分别同芳基硼酸、烯基硼酸及烷基硼试剂进行的Suzuki偶联反应中的表现。

Furthermore, the properties differences of phosphines and solvents resultin the differences of mechanism.

并且由于膦的性质和溶剂性质的差异导致了机理上的不同点。

Satisfactory results showed that INI and a, were obviously related with 31P NMR chemical shifts of phosphines.

结果表明：INI、ε与31P NMR谱化学位移显著相关。

Satisfactory results showed that INI and εi were obviously related with 31P NMR chemical shifts of phosphines.

结果表明：INI、εi与31P NMR谱化学位移显著相关。

Topics covered include phosphines, applications of phosphorus and compounds as reagents in synthesis, the chemistry of phosphorus ylides, applications of the Wittig reaction in the synthesis of heterocyclic and carbocyclic compounds, preparation of Iminophosphoranes and their synthetic applications in the aza-Wittig reaction, phospho-transfer processes leading to bond formation, low valent phosphorus compounds and phosphorus methods in oligonucleotide chemistry.

包括的题目包括phosphines，磷的应用和作为在综合过程中的试剂的化合物，磷ylides的化学，在heterocyclic 和carbocyclic 化合物的综合过程中的威蒂格反应的应用， Iminophosphoranes的准备和在aza-威蒂格反应里的他们的合成申请，phospho 转换过程导致在oligonucleotide 化学方面的契约形成，低的化合价磷化合物和磷方法。

Topics covered include phosphines, applications of phosphorus and compounds as reagents in synthesis, the chemistry of phosphorus ylides, applications of the Wittig reaction in the synthesis of heterocyclic and carbocyclic compounds, preparation of Iminophosphoranes and their synthetic applications in the aza-Wittig reaction, phospho-transfer processes leading to bond formation, low valent phosphorus compounds and phosphorus methods in oligonucleotide chemistry.

包括的题目包括phosphines，磷的应用 Application 和作为在综合过程中的试剂的化合物，磷ylides的化学，在heterocyclic 和carbocyclic 化合物的综合过程中的威蒂格回应的应用 Application ， Iminophosphoranes的准备和在aza-威蒂格回应里的他们的合成申请，phospho 转换过程导致在oligonucleotide 化学方面的契约形成，低的化合价磷化合物和磷方法。

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。