丁烯基

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。

Firstly, 24 chiral Schiff base ligands were prepared and evaluated for theasymmetric HDA reaction between Brassard diene with benzaldehyde. Theresults revealed that the ligand derived from 3,5-di-tert-butylsalicylaldehydewith (1R,2S)-2-amino-1,2-diphenyl-1-ethanol shows an excellent chiralinduction in the reaction.

首先合成了 24 个手性三齿席夫碱配体，并应用于 Brassard 二烯与苯甲醛的不对称 Hetero-Diels-Alder 反应，结果表明，3，5-二叔丁基水杨醛与(1R，2S)-1，2-二苯基-2-氨基-乙醇生成的单席夫碱显示出优秀的手性诱导能力。

Finasteride has been facilely synthesized from 4-androstene-3, 17-dione by oxidation, ammoniumation, cyanohydrin, dehydration, Ritter reaction, hydrogenation and dehydrogenation.

本文参考有关文献，以雄烯二酮为起始原料，经氧化开环、内酰胺化、氰醇化、Ritter反应引入叔丁基酰胺、氢化还原、最后氧化脱氢制得非那雄胺。

Here we synthesized a CTA Z-1, 2-(oxiran-2-ylmethoxy ethane, and used it to end the ROMP reaction.

然后，我们利用酯化的方法，设计合成了叔丁基保护的降冰片烯衍生物单体。

Based on the experimental results,di-butyl-peroxide,di-cyclopentadiene and propyl nitrate are found to be sensitive to the change of heating temperature and heating time,and their thermal decomposed products can be detected easily.

实验表明，在343～473 K温度范围内，过氧化二叔丁基、双环戊二烯和硝酸丙酯对受热温度和受热时间的变化较为敏感，热分解现象明显，热分解产物易于检测。

Three methods are used to prepare molecular imprinted polymers,which include conventional bulk technique or polymerization with ultraviolet initiated in low temperature and polymerization with silica-gel as sacrificial materials. In the polymerization procedure , Sulfamethazine(SM2)and Sulfisoxazole were used as target template molecules, methacrylic acid and 4-vinylpyridine(4-VP) and acrylamide were selected as functional monomers, ethylene glycol dimethacrylate as crosslinker, azobisisobutyronitrile was used as initator.

主要工作如下：首先，以磺胺异噁唑和磺胺二甲嘧啶为模板，分别以4-乙烯基吡啶，甲基丙烯酸，丙烯酰胺为功能单体，以二甲基丙烯酸乙二醇酯为交联剂，偶氮二异丁腈为引发剂，采用了传统方法(60℃恒温水浴)、牺牲硅胶法及低温紫外光聚合法等三种方法合成了一系列的磺胺类药物印迹聚合物。

A method to synthsis a - methylene - r - butyrolactones was reported by the substituted (a - carbethoxyvinyl) cuprate intermediates, generated by the addition of higer order cuprate to acetylenic ester,traping with epoxides stereoselectively.

本文报道了通过以高序铜代替低序铜对炔酸酯加成得到的取代铜与端基或环状环氧化合物的立体选择性反应，较高产率的合成α，β-取代烯酯，进而可合成α-亚烷基-γ-丁内酯类衍生物。

The catalytic system composed of NHPI and transition metal ion can catalyze effectively ethane into acetic acid,cyclane into dicarboxylic acid,toluene into benzoic acid,alkene into epoxide,alkyne into acetylenic ketone,and amide into imide;NHPI used alone can catalyze adamantane to be carbonylated,hydrogen peroxide prepared by oxidization alcohol;NHPI combined with as...

NHPI与过渡金属离子组成的催化体系能高效地催化乙烷氧化为乙酸、环烷烃氧化为二元羧酸、甲苯氧化为苯甲酸、烯烃氧化为环氧化物、炔烃氧化为炔酮、酰胺氧化为酰亚胺；NHPI单独使用能催化金刚烷发生氧化羰基化反应、催化氧化醇制取过氧化氢；NHPI与有机助催化剂如偶氮二异丁腈、溴化季铵盐、蒽醌和醇等也能催化分子氧氧化反应。

One synthetic strategy started fromγ-butyrolactone 38, from which a cyclohexadiene intermediate 30 was prepared in an overall yield of 44% in a 7-step procedure after y-butyrolactone underwent a-bromination, dehydrobromination, Diels-Alder reaction, aminolysis, benzylation, bromination and dehydrobromination, with the key step being the Diels-Alder reaction under harsh condition.

其中一个路线从γ-丁内酯38开始，连续经过α-溴化、脱溴化氢、Diels-Alder反应、胺解、苄基化、溴化和脱溴化氢共7步反应，制备了一个环己二烯衍生物30，总产率44％，关键步骤是高温高压下Diels-Alder反应。

Titanium silicalite 1(TS 1)with different crystal size s were synthesized in the system of TPABr n butylamine by adjusting the formation of gel and the method of crystallization.

在四丙基溴化铵正丁胺体系中合成不同晶粒大小的TS 1沸石，采用IR、XRD UV Vis、SEM、2 7AlMASNMR对其进行表征，并以丙烯环氧化反应为探针考察其催化性能。

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。