烯

The result makes clear, its bases is spiny dogfish Xi (39.4%), flax is acerbity (20.5%), clove is phenolic (14.7%), Xie Luchun (7.89%), palmy acid (4.81%),γ- Yi Lan oily Xi (3.36%) and 4-(4, 5- 2 methylic phenyl)- Pai Ding (1.29%).

结果表明，其主要成分为角鲨烯(39.4%)、亚麻酸(20.5%)、丁香酚(14.7%)、叶绿醇(7.89%)、棕榈酸(4.81%)、γ-衣兰油烯(3.36%)和4-(4，5-二甲基苯基)-哌啶(1.29%)等。

Systematic studies on the Hetero-Diels-Alder reaction between the o-Quinone methidesand different enol ether dienophiles for the construction of the spiroketal skeleton was described.

较系统地研究了邻甲基苯醌与不同的烯醇醚亲双烯体之间的Hetero-Diels-Alder反应对螺环缩酮结构的构筑及其应用。

In addition, ioding was found to be an efficient catalyst for the imino Diels-Alder reaction of N-arylimine and enol ethers and the reaction provided tertrahydroqinolines in good yields. One pot synthesis of tetrahydroqinolines from aldehyde, aniline and enol ethers was also achieved using iodine as the catalyst. The chemical yield of the"one pot"reaction was comparable with that obtained using preformed N-arylimine.

此外我们也发现碘能够有效地催化N-芳基亚胺与烯醇醚的Diels-Alder反应，以很高的化学收率得到了四氢喹啉衍生物，并且发现碘也能够直接催化芳香醛、苯胺、烯醇醚的三组分"一锅"反应，获得的化学产率与使用预制的N-芳基亚胺相当。

Zeolite shows high catalytic activity for hydration etherification of propene, but its stability needs to be improved.

采用该方法改性的催化剂，对丙烯水合醚化反应连续运转 72 0h ，丙烯转化率由 5 6 6 %仅降为 5 2 %，表明催化剂稳定性得到明显改

In this paper the surface charge density of cationic kraft pulp was chosen as response variable and the preparation conditions of cationic kraft pulp by the in-situ grafting copolymeration of acrylamide and cationic monomer, [2- ethyl] trimethyl-ammonium chloride were optimized by central composite design.

摘 要：以阳离子硫酸盐浆的表面电荷密度为评价指标，采用中心复合设计法对丙烯酰胺和甲基丙烯酰氧基乙基三甲基氯化铵接枝共聚制备阳离子硫酸盐浆的工艺进行了优化。

Diallylethylamine was synthesized from ethylamine, allyl chloride and alkali. The structure was characterized by 1H NMR, IR and elemental analysis.

以乙胺、烯丙基氯和碱为原料合成了二烯丙基乙胺，其结构经1H NMR，FT-IR和元素分析表征。

From 3-chloropropene bycondensation with sodium ethylate in ethanol to form 3-ethoxypropene followed by anti-Markovnikov addition with HBr inthe presence of benzoyl peroxide.

3-氯丙烯与乙醇钠在乙醇中回流制得3-乙氧基丙烯，继而在过氧苯甲酰存在下，与溴化氢经反马氏加成制得1-溴-3-乙氧基丙烷，总收率89。

A series of ethylene/propylene copolymers with different propylene contents were prepared and the microstructure was characterized by ~(13)C-NMR, GPC and DSC.

2在聚合物链中，丙烯单元单个存在，即使在丙烯含量高达14.93mol％的聚合物中，也是如此。

The copolymerization compound comprises based on a proportioning ratio by weight: 25-99 percent ethylene aromatic series monomer; 0-30 percent olefinic undersaturation nitrile monomer; 1-50 percent olefinic dibasic acid ramification monomer.

这种共聚组合物按重量百分比包含：25至99％的乙烯基芳香族单体；0至30％的烯属不饱和腈类单体；1至50％的烯属二元酸衍生物单体。

In this study, main chain of 4,4'-Biphenol combine different side chains to discuss polymer ~ polymer which synthesizes by the difference of structure of 1-Bromobutane、1-Bromoocatane、1-Bromododecane.To examinate luminance property and judge the correction for the structure of polymer ~ polymer by FT-IR、NMR-1H、UV、PL, in the meanwhile,to investigate into radiation wavelength under the condition of different side chains.

中文摘要 1。本实验是利用4，4'-Biphenol为起始物，与Allyl bromide反应，产生丙烯基芳基醚化合物，再利用克莱森重排反应将丙烯基转至邻位，然后在将OH基转变为不同链长的烷基醚合成出聚合物耤I），以FT-IR、NMR-1H、UV、PL测定其发光性质及判断产物结构是否正确，并探讨化合物在不同侧链之条件下，比较其放射波长。

The labia have now been sutured together almost completely.The drains and the Foley catheter come out at the top.

此刻阴唇已经几乎完全的缝在一起了，排除多余淤血体液的管子和Foley导管从顶端冒出来。

To get the business done, I suggest we split the difference in price.

为了做成这笔生意，我建议我们在价格上大家各让一半。