戊烯

The reaction of polyfluoroalkyl iodides with 4-pentenoic acids in the presence of sodium dithionite at room temperature in aqueous acetonitrile solution [CH〓CN: H〓O=3: 1 ] to gave the corresponding adducts, the latter could form γ-lactones 31～51 in the same medium in 62～92％ yield.

室温下，在乙腈/水[3：1]的介质中，多氟烷基碘化物在连二亚硫酸钠的存在下与4-戊烯酸及其在2或3位上具有取代基团的衍生物进行反应，反应2～5h，起先生成两者的加成物，该加成物无需分离，在同一介质中，可进一步反应得到相应的多氟烷基取代的γ-丁内酯31～51，产率62％～92％。

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。

Furthermore, the important fragment which is composed of pentenyl cinnamic acid and D-Tyrosine, and the ester which is composed of L-N-methylated phenyl amino acid and diketopiprazine was synthesized with considerable yield The conjugation of the new DOPA analogue into the peptide in the total synthesis of Pepticinnamin E was investigatited

另外，本文作者还进一步合成了高收率的戊烯基肉桂酸衍生物与D-酪氨酸的缩合片段及L-N-甲基苯丙氨酸与哌嗪二酮的酯两个重要的结构组成部分；对新多巴衍生物片段嵌入肽链中的工作亦进行了有益的尝试。

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。

Over the years, Masson's food additive brand -"Silver Valley" has been at the forefront of China Food Additive Industry forefront of the reform In 1984, the first in the domestic market development and production of soybean products for human consumption antifoamer; in 1988, took the lead in the domestic market development and production of edible spices - cyclopentyl enol methyl ketone; in 1989, took the lead in the domestic market to develop speed-fat cake oil; In 1992, the first in the domestic market development and production of ice cream and beverage emulsion stabilizer; in 1999, introduced the internationally advanced level molecular distillation Monoglyceride domestic exclusive CPP realize industrial production

多年来，美晨公司的食品添加剂品牌--"银谷"一直站在中国食品添加剂工业改革的潮头 1984年，率先在国内市场开发生产豆制品食用消泡剂；1988年，率先在国内市场开发生产食用香料--甲基环戊烯醇酮；1989年，率先在国内市场开发速发蛋糕油；1992年，率先在国内市场开发生产冰淇淋和饮料乳化稳定剂；1999年，推出具有国际先进水平的分子蒸馏单甘酯，在国内独家实现CPP工业化生产

The isomerization process of crude isopentene was studied.

对粗异戊烯的异构化工艺进行了研究。

Phase separation (nonsolvent induced phase separation,spreading solution on water surface and so on),melt stretch,thermally induced phase separation are included.

重点介绍了聚4–甲基–1–戊烯微孔膜各种制备方法的原理、过程、影响因素和膜的结构特点。

Preparation of low density poly (4 methyl 1 pentene) foam is described.The thermal analysis method is utilized to measure on line the gelation of pmp polymer in the binary solvent (durene/naphthalene) or nonsolvent system.

在聚-4-甲基-1-戊烯pmp）低密度泡沫的制备中，利用示差扫描量热分析仪对pmp聚合物在均四甲苯/萘所组成的溶剂/非溶剂二元体系中的凝胶化过程进行在线测量。

This paper measures the critical energy of detonation of hydrocarbon fuel(butane,naphtha,pentene,hexene,JC5) and air mixtures using Bruceton method in the rectangular shock tube.

该文在矩形激波管内采用布鲁塞顿法测定了丁烷、石脑油、戊烯、己烯、JC5等碳氢燃料与空气混合物形成爆轰时所需的临界起爆能，并根据所测定的临界起爆能的大小，分析比较了这几种碳氢燃料的相对爆轰敏感度及相应的安全性能，最后讨论了分子量，分子中键的饱和度和分子结构等因素对碳氢燃料临界起爆能及相应的安全性能的影响。

The results show that both norbornenic and cyclopentenic double bonds are involved in the polymerization. The propagation on the NB double bond generates structural unit I by direct addition and unit II by carbocation rearrangement, respectively. Similarly, the propagation on the CP double bond produces structural unit III by direct addition and unit IV by transannular rearrangement, respectively.

结果表明， DCPD分子的降冰片烯双键和环戊烯双键均参与了聚合反应并根据不同链增长机理产生四种链结构单元：通过NB双键的链增长反应可生成直接加成结构单元I和重排结构单元II，通过CP双键的链增长反应生成直接加成结构单元III和跨环重排单元IV。

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。