烯

The asymmetric allylation of aldehydes is one of the most important methods for preparation of chiral homoallylic alcohol, which is the building block in organic synthesis of fine chemistry and drugs.

手性烯丙基醇是一类重要医药中间体，合成手性烯丙基醇的常见方法是醛的不对称烯丙基化反应。

Because these substrates are synthesized from the corresponding allylic alcohols, palladium-catalyzed conversion of allylic alcohols directly into allylation products are highly desirable, especially from the viewpoint of the atom economy.

因为这些受质是从烯丙醇合成的，钯催化烯丙醇转换直接变成烯丙基化合物从原子经济的观点来看是较有益处的。

E. value of productions were detected by high performance liquid chromatography. Results The chiral aminoalcohol ligand compound Ⅰ can promote the asymmetric allylation of acylhydrazones and the yield was 57%; The highest values of e. e. obtained for this reaction was 22%.

结果 手性氨基醇配体化合物Ⅰ能够促进烯丙基三氯硅烷和酰腙的烯丙基化加成反应，在它的辅助作用下，烯丙基化加成产物的产率可达到57%，对映体过量值最高达到22%。

Three new ferrocenylmethyl-substituted indenes and cyclopentadienes were synthesized by the addition of hydrogen anion and carbon anion to fulvene and benzofulvene respectively, moreover, their structures were characterized by NMR and MS.

本文以二茂铁基富烯和二茂铁基苯并富烯为前体，通过负氢和负碳对双键的加成，合成了3个新型的二茂铁基甲基取代的茚及环戊二烯，并对其结构进行了核磁及质谱表征。

Temperature-sensitive hydrogels P(NIPA-co-DiAB) with aromatic group as hydrophobe was were prepared by free radical micellar crosslinking copolymerization with N-isopropyl acrylamide, N,N-dially benzylamine as comonomers, N,N-methylene-bis-acrylamide as crosslinker, sodium dodecyl sulfate as surfactant and ammonium persulfatetetramethylethylenediamine as initiator system.

以N-异丙基丙烯酰胺、N，N-双烯丙基苄胺为共聚单体、N，N-亚甲基双丙烯酰胺为交联剂、十二烷基硫酸钠为表面活性剂、过硫酸铵-四甲基乙二胺为氧化还原引发体系，采用自由胶束交联共聚法合成了疏水基团为芳香基的疏水改性温敏性智能水凝胶P(NIPA-co-DiAB)。

Based on studies of RCM reaction of 50 and CM reaction ofacrylonitrile with 1-octene or 1-decene catalyzed by pyridine derivative-coordinatedruthenium benzylidene complexes, it can be concluded that ruthenium benzylidene complexwith the more labile dissociating ligand exhibits the higher initial activity and better catalyticperformance.

吡啶衍生物配位的钌卡宾配合物催化含氰基烯烃50闭环交互置换反应和丙烯腈与1-辛烯、1-癸烯交叉交互置换反应表明，催化剂中吡啶衍生物配体越易解离，其初活性越高，催化活性越好。

Two novel soluble poly, poly [(3-butyrylpyrrole-2, 5-diyl) p-nitrobenzylidene] and poly [(3-butyrylpyrrole-2, 5-diyl)(3-hydroxy-4-methoxy) benzylidene], were synthesized firstly by condensation of 3-butyrylpyrrole with p-nitrobenzaldehyde and vanillin, respectively.

通过3-丁酰基吡咯单体分别与对硝基苯甲醛和香草醛的缩聚反应，成功合成了两种新型可溶性聚吡咯甲烯衍生物－策［（3-丁酰基吡咯－2，5-二）对硝基苯甲烯］和聚［（3-丁酰基吡咯－2，5-二）（3-羟基－4-甲氧基）苯甲烯］。

Or FR4 PCB, bromide exsited mainly in pyrolysis gas and gas products mainly consisted of CO, CO2, propylene, 2-methacrylate, bromomethane, and a small amount of acetone, C1-C3 halogenation alkyls. The pyrolysis gas could be reclaimed as fules after debromide treatment. Pyrolysis liquid products consisted of 8.333% water and 91.667% oil component.

R4板中溴元素主要存在于气体产物中，气体产物主要为CO、CO2、丙烯、2-甲基丙烯、溴甲烷以及其他小分子烯烷烃产物，气体产物可通过除溴无害化处理作可燃气回收；液体产物中含有8.333%的水和油质成分。

The results show that isobutene oligomerization is fast liquid-solid reaction. Under the temperature of 80 ℃～120 ℃ and pressure of 2.0 MPa, the products of oligomerization are mainly dimers and trimers of isobutene. The yield of trimers is higher than that of dimers and the mass fraction of trimers decreases with reaction temperature increasing. The yield of tetramers is much lower than that of dimmers and trimers. The tetramers are formed by reaction of isooctenes and C8 carbonium ion.

结果表明，异丁烯齐聚反应为快速液固相催化反应，在80 ℃～120 ℃，2.0 MPa的实验条件下，反应产物主要是异丁烯的二聚物和三聚物，且三聚物的收率远高于二聚物，两者的浓度比值随反应温度的升高而下降；少量四聚物的生成主要源于碳八烯烃与碳八正碳离子的反应。

The effect of zeolites ion-exchanged by transition metals on thermal catalytic cracking reaction is studied. The product distributions of the cracking reactions catalyzed by theβor ZSM-5 zeolites exchanged with transition metals are different from that catalyzed by corresponding Hzeolites, which means the mechanism of cracking reactions has varied. Group Ⅷ metals Fe, Co, Ni and Cu, Zn are shown to be of strong catalytic activity of oxidative dehydrogenation, while Ti and Cr are not of oxidative activity. Catalyzed by zeolites or catalyst containing Ag, conversion of thermal catalytic cracking reactions and the yield of ethylene increase while the yield of propylene does not decrease. Silver can not only promote the formation of carbonium ion, but also convert carbonium ion into free-radical via redox reaction. The weak adsorption of olefins on silver reduces the occurrence of hydrogen transfer and dehydrogenation. As a result, the yield of light olefins is favored by silver in the catalyst.

采用过渡金属交换的分子筛作为催化剂，进行催化热裂解制取乙烯的反应，研究发现，在β沸石分子筛和ZSM-5分子筛中引入过渡金属后，催化热裂解反应的产物分布与相应的氢型分子筛相比有了较大的变化，说明过渡金属的加入对于催化热裂解反应的机理具有影响，Ⅷ族金属如Fe、Co、Ni和第Ⅰ、Ⅱ副族Cu、Zn表现出较强的氧化脱氢活性，产物中氢气、焦炭的产率很高，Ti、Cr则未表现出氧化作用：分子筛及催化剂中引入银后，催化热裂解反应的转化率和乙烯的产率有了提高，丙烯产率没有很大的变化，说明银在催化热裂解反应中能够促进正碳离子的生成，又有可能通过氧化-还原作用部分改变反应机理，促进了自由基的生成，并且由于银对烯烃的吸附很弱，其氢转移反应和脱氢、加氢活性比较低，有利于烯烃产率的提高。

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。