环烯

Deoxidization reaction of straw alkali lignin and hydrogen was investigated in the presence of Pd/C catalyst.

以钯/炭为催化剂，以氢气为还原剂与麦草碱木质素进行反应，分析了不同反应条件对催化效果的影响，用化学法测定了反应前后碱木质素官能团的含量，并与环己烯还原法进行了比较。

Stable pharmaceutical compositions containing 8-chloro-6,11-dihydro-11-(4-piperidylidene)-5H-benzo[5,6] cycloheptic [1,2-b] pyridine and a DCL protective amount of a pharmaceutically acceptable basic salt such as calcium dibasic phosphate and an amount of at least one disintegrant, preferably two disintegrates such as microcrystalline cellulose and starch sufficient to provide dissolution of at least about 80% by weight of the pharmaceutical composition in about 45 minutes and suitable for oral administration to treat allergic reactions in mammals such as man are disclosed.

本发明公开了含有8－氯－6，11－二氢－11－（4－亚哌啶基）－5H－苯并［5，6］环庚三烯并［1，2－b］吡啶和DCL保护量的可药用碱性盐如磷酸氢钙以及其含量足以使至少约80％的药物组合物在约45分钟内溶解的至少一种崩解剂、优选两种崩解剂如微晶纤维素和淀粉并且适于口服给药以治疗哺乳动物、例如人的过敏反应的稳定的药物组合物。

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。

It may result from the coupling of acarbonyl group in one molecule with the double bond in another molecule.

它是由一分子环丁烯二酮的羰基碳与另一分子的双键β-碳发生还原偶联的结果。

It can be presumed that acting point of salicylic acid is possible before oxidation of taxa-diene exocycle double bond.

因而推测柠檬酸钠的作用位点很可能在紫杉二烯环外双键氧化之前。

In addition, a series of double stranded polymers by using furan-containing oligoaryls as linkers was synthesized.

另一方面，我们将连接降冰片烯骨架的基团，以一系列不同共轭长度的苯环呋喃交错寡聚物取代。

The results of electron affinity and ionization potential show that theelectron transfer properties of quinone are enhanced with the enlongation of thesubstituent.

电子亲和势和电离势的研究结果表明，随着醌环上异戊烯支链的增长，醌的电子传递能力有增强的趋势。

At the meantime, we synthesized the chiral spiroketal enol ether steroselectively and their absolute configuration were determined.

我们还对螺环缩酮烯醇醚类化合物的立体选择性形成规律进行了探索，并取得了积极的结果。

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。