异丙烯基

Covalent modification of four isolated alkannin derivatives (alkannin, acetylalkannin,β,β dimethylacrylalkannin and β acetoxyisovalerylalkannin, respectively) on rabbit muscle latate dehydrogenase and yeast Alcohol Dehydrogenase has been studied.

为研究紫草萘醌类化合物的细胞毒性作用机制，从新疆软紫草根中分离出四种紫草萘醌类化合物β，β二甲基丙烯酰阿卡宁(1)，乙酰阿卡宁(2 )，β乙酰氧基异戊酰阿卡宁(3)和阿卡宁(4)。

Compared with TEA,TiBA activated system produced more blocky copolymer,but the blockiness of its block fraction is lower.

与三乙基铝相比，三异丁基铝为助催化剂得到的不溶级份含量及丙烯含量都较高，但其嵌段性却较低。

The constituents were extracted by some solvents. 18 constituents were isolated from Chloroform fraction by different chromatography. 15 constituents were identified by IR ,MS and NMR as follows: 3-sitosterol, P-sitosterylpalm itate,succinate acids, 1, 4-benzenediol, 1, 2-benzenediol, p-hydroxybenzaldehyde, syringaresinol, oleanolic acid, usolic acid, ethyl caffeate , Rosmarinic acid ethylster and etc. In such constituents ,nine compounds were isolated for first time from Origanum vulgare L..

牛至药材经水煮醇沉法所得浸膏，利用溶剂法和色谱法从中分离得到18个单体成分，通过IR、MS、NMR等波谱技术鉴定了其中的15个化合物，分别为β-谷甾醇(1)、β-胡萝卜苷(2)、琥珀酸(3)、对-二苯酚(4)、邻-二苯酚(5)、对羟基苯甲醛(6)、1.2-二羟基-4-异丙基-5-甲基苯(7)、新木脂素(8)、丁香脂素(9)、齐墩果酸(10)、乌苏酸(11)、4-二十六烯(12)、正二十六醇(13)、咖啡酸乙酯(14)、迷迭香酸乙酯(15)等，其中化合物3、4、5、6、7、8、9、14、15等9种化合物均为首次从该属植物中分离得到。

It was found that ARA was composed of esterification products of (2-HEA)-ester with pimaric acid, dehydroabietic acid, abietic acid and two isomers of acrylpimaric acid. ARA is a good crosslinking agent which can copolymerize with most vinyl monomers. The properties of solvent-resistance and heat resistance of the copolymer were improved considerably by the use of ARA.

实验结果表明：ARA主要由海松酸、脱氢枞酸、枞酸和丙烯海松酸的二种异构体的丙烯酸－2-羟基乙基酯的酯化产物组成，ARA是一种良好的交联剂，可与大多数乙烯基单体共聚合，其与MMA的共聚物的耐溶剂性和耐热性均得到了较大幅度的提高。

In this thesis, monomer with unsaturated double bond was firstly synthesized byreacting acryloyl chloride with bifunctional monomer. Such synthesized monomer ormonomer with initial unsaturated double bond was used to prepare linear polymericmaterials by free radical polymerization. A series of new degradable space polymerswith acylamino bond were subsequently synthesized using diisocyanate as thecross-linker.

本文首先通过丙烯酰氯和双官能团单体反应引入不饱和双键，或者直接使用具有不饱和双键的单体，通过自由基聚合得到含有活泼羟基或氨基的线型高分子聚合物，再用二异氰酸酯作为交联剂交联，从而合成了一系列基于酰胺键的新型可降解高分子体型聚合物。

The p-Isopropylbenzoic acid was synthesized by catalytic transfer dehydrogenation with 5% Pd/C using dihydrocumic acid as material and hydrogen offer, industrial dipentene as hydrogen acceptor and solvent, reacted directly under reflux condition.

采用5% Pd/C作为转移氢催化剂，原料二氢枯茗酸为氢给予剂，以工业双戊烯作为氢接受剂和溶剂，合成了对异丙基苯甲酸。

The all cis-structure of the cyclizative product was found. The construction of the enolic hydroxyl structure became easier and excellent.

合成中发现环化产物为全顺式结构，烯醇式结构的建立更为简洁、高效，异丙基在较复杂的结构下实现了一步引入。

The coating composition comprises, in a specific proportion, a vehicle ingredient comprising in a specific proportion an oligomer having at least twoacrylate groups and an ethylenic monomer copolymerizable with the oligomer, aacrylic-modified chlorinated polyolefin having a specific chlorine content, an organic peroxide polymerization initiator, and a polyisocyanate compound.

该涂料组合物含有特定比例的由至少具有两个丙烯酸酯基的低聚物和可与该低聚物共聚的乙烯性不饱和单体形成的媒介物成分、特定氯含率的丙烯酰基改性氯化聚烯烃、有机过氧化物聚合引发剂、和聚异氰酸酯化合物。

The main components were myristic acid (19.37%), palmitic acid methyl ester(7.56%), lascorbic acid 2,6dihexadecanoate(6.27%), 8,11octadecadienoicacid methyl ester(5.22%), heptadecane(4.82%), lauryl ethoxylate(2.98%), 2isopropyl5methyl1heptanol (2.62%), tetracosanoic acid methyl ester(2.12%),2ethyl2methyltridecanol (2.08%), et al.

其化学成分主要为肉豆蔻酸(19.37%)，棕榈酸甲酯(7.56%)，2，6十六烷基1抗坏血酸酯(6.27%)，8，11十八碳二烯酸甲酯（5.22%），十七烷（4.82%），十二烷基乙氧基醚（2.98%），2异丙基5甲基1庚醇(2.62%)，二十四烷酸甲酯（2.12%），2乙基2甲基十三醇（2.08%）等。

Single component and multi\|component of iron system colloidal catalyst \Ali\|Bu\-3CH\-2CHCH\-2Cl\ were mixed by different ratios in hydrogenated gasoline medium at 25℃.This paper studied the relationship between the nonaqueous systematic electroconductivity and the concentration of catalyst components.In combination with Tyndall effect,polymerization experimental results,Ali\|Bu\-3 existed in associated state and dissociated into ionpair.The reaction between Ali\|Bu\-3 and Fenaph\-2 was the main reaction which formed colloidal core.Ali\|Bu\-3 reacted on CH\-2CHCH\-2Cl and Ali\|Bu\-2Cl was yielded which joined the formation of active center on the surface of colloidal core.The excessive Ali\|Bu\-3 was dissociated into ionpair which formed double electrode layer,and the double electrode layer kept the colloidal particles relatively stable.

研究了在25℃加氢汽油介质中，铁系胶体催化剂［Fenaph2Ali-Bu3―CH2==CHCH2Cl］单组分、多组分按不同配比混合，非水体系电导率与浓度的关系，结合Tyndall效应，聚合实验结果，得出Ali-Bu3以缔合状态存在并解离成离子对它同环烷酸亚铁的作用是形成胶核的主要反应，与氯丙烯反应生成的氯化异丁基铝，在胶核表面参与形成活性中心由过量Ali-Bu3解离的离子对形成的双电层结构，使胶粒保持相对稳定。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。