查询词典 iodides

The photodissociation mechanism of long-chain alkyl iodides and cyclic alkyl iodides at 267 nm were studied using ion velocity imaging technique.

利用离子速度成像方法对碘代直链烷烃和环烷烃分子在267 nm下的光解断键机理进行了研究。

In the chapter 2 of this dissertation, we studied the cross-coupling reaction of aryl halides and vinyl iodides with sodium azide under the catalysis of copper and amino acids.

在4-碘茴香醚与叠氮化钠的模型反应中，我们考察了不同溶剂、氨基酸、碱、铜盐对反应的影响，最后筛选出了最佳的反应条件：CuⅠ/脯氨酸/NaOH/DMSO。

The reaction of perfluoroalkyl bromide and a,w-perfluoralkylene dibromide in sulfinatodehalogenation system with olefins and the differences in behavior between perfluoroalkyl bromides and their corresponding iodides are reported.

本文报道溴代全氟烷和α，ω-二溴代全氟烷在亚磺化脱卤反应体系中与烯烃的反应及其与相应的碘代全氟烷的区别。

The reaction of fluoroalkyl iodides with ethyl vinyl ether and amines in the presence of sodium dithionite was studied.

研究了在保险粉存在下，氟烷基碘(1)与乙烯基乙醚和伯胺或仲胺(2)的反应。

The reaction of polyfluoroalkyl iodides with 4-pentenoic acids in the presence of sodium dithionite at room temperature in aqueous acetonitrile solution [CH〓CN: H〓O=3: 1 ] to gave the corresponding adducts, the latter could form γ-lactones 31～51 in the same medium in 62～92％ yield.

室温下，在乙腈/水[3：1]的介质中，多氟烷基碘化物在连二亚硫酸钠的存在下与4-戊烯酸及其在2或3位上具有取代基团的衍生物进行反应，反应2～5h，起先生成两者的加成物，该加成物无需分离，在同一介质中，可进一步反应得到相应的多氟烷基取代的γ-丁内酯31～51，产率62％～92％。

The reaction of polyfluoroalkyl iodides with 4-pentenoic acids initiated by sodium dithionite was realized to give polyfluoroalkyl substituted lactones.

我们研究了多氟烷基碘代烷与4-戊烯酸类化合物等在连二亚硫酸钠引发下的反应，得到了氟烷基取代的内酯化合物，我们将该反应称为氟烷基化内酯化反应；并建立了一个利用该反应合成含氟内酯的新方法，首次利用氟烷基化内酯化反应进行高立体选择性双环含氟内酯及手性含氟内酯等的合成，已合成含氟内酯新化合物50余种。

The mechanism was supposed as follows: polyfluoroalkyl iodides were initiated by sodium dithionite to give R〓 which was added to one double bond of diallylacetic acid, after the sequential radical cyclization and nucleophilic substitution to form bicyclo-lactones.

这是因为：多氟烷基碘化物在连二亚硫酸钠的引发下，得到自由基R〓，后者加成到二烯丙基乙酸中的一个—C=C—双键上，然后在碱性介质中进行分子内亲核反应得到双环内酯类产物。

Polyfluoroalkyl iodides could react with unsaturated olefin acids in the presence of sodium dithionite by radical addition to give adducts. It was found that these adducts could form polyfluoroalkyl substituted γ or δ-lactones due to intramolecular nucleophilic substitution in the alkali solution.

研究发现：多氟烷基碘化物在连二亚硫酸钠存在下与不饱和烯酸经自由基加成得到的产物，能在碱性条件下进行分子内亲核取代反应形成五元或六元环的含氟内酯类化合物。

In chapter 2, the Michael additions of functionalized organozinc iodides with α,β-unsaturated aldhydes, ketenones, esters and l-aryl-2-nitroetheneshave been investigated in the presence of Cu〓/ 2LiCl.

第二章主要研究了在低毒、稳定、易得、价廉的Cu〓存在下，带官能团的有机碘化锌与α，β-不饱和醛、酮、酯及1-硝基-2-芳基乙烯的Michael加成反应，并探讨了反应机理。

However, alkyl-substituted propargylic dithioacetals could be synthesized by the displacement reaction of the corresponding terminal alkynes with alkyl iodides.

烷基取代的炔丙基硫缩酮衍生物，则能利用相对应的末端炔和碘烷亲电基进行取代反应所获得。

You can snipe the second and third union leaders from this position.

您可以鹬第二和第三工会领袖从这一立场出发。

Aiming at the currently shortage of XML streams quality detecting, this paper proposes a new forecasting method of XML streams quality by least squares support vector machines, which is used the method of XML keys' vector matrix as windows, and vector product wavelet transform to multilevel decompose and refactor the XML streams series, that can fulfill real-time checking demand of XML quality, and ensure constraint, consist- ency and integrality. For even more adapting net load, it proposes a control strategy by weight and adaptive adjustment to ensure XML streams quality.

针对当前XML数据流质量检测存在的不足，提出构建XML键的矢量矩阵作为窗口，利用矢量积小波变换多级分解与重构XML数据流，再结合最小二乘支持向量机对XML数据流质量进行预测的一种方法，满足XML数据流质量重构时实时检测的要求，保证XML数据的约束性、一致性与完整性；为了更好的适应网络负载，采取加权与自适应窗口调整等调度策略充分保证XML数据流的质量检测。