烯基

Firstly, one of the two key intermediates, tetrahydrofuran fragment with aterminal alkyne 27, was prepared from D-glucose utilizing a multiple-step sequencedeveloped by us earlier.

在本组过去的工作基础上，我们从葡萄糖出发，获得了含有四氢呋喃环的炔化合物27。同时，从木糖及炔丙醇出发，获得了一端为γ内酯环的烯基碘化合物14，即C1-C13片断。

The easy recovery of chiral auxiliary, good selectivity and high yield of this reaction make it a potential method in the synthesis of multifunctional optically active cyclopropane derivatives.

手性硫叶立德控制的高对映选择性合成多取代烯基环丙烷衍生物。

In all cases, only the biboronic products with one boryl group adding to the middle carbon and the other to the nonsubstituted terminal carbon of the allene moiety were observed.

两个硼酯基都接於丙二烯基没有取代的末端双键上。立体选择性很高，主要的产物都是Z form的形式。

Reduction of 2-bromodifluoromethyl substituted propargyl vinyl ether afforded the difluorovinyl propargyl ether, which rearranged to the corresponding allene bearing a gem-difluoromethene in the mid-aliphatic chain.

第三部分，在碱性条件下，α-氟烷基乙酸乙酯与炔丙醇反应制备了一系列的氟烷基取代的炔丙基烯基醚，并研究了它的Claisen重排反应，得到了2，4-不饱和的氟烷基酮。

Erpenyl of TOM were confirmed mainly exist as isobornyl.

OM和TOSS中的萜烯基主要是异冰片基。

From Leontopodium nanum (collected from Zhang County, Gansu Province), 12 compounds were isolated, of which 9 compounds have been identified. Among them, a derivative of coumarin is new.

从采自甘肃漳县的矮火绒草全草的甲醇提取物中，采用同样方法共分离纯化得到12个化合物，鉴定了9个化合物的结构，其中有1个新化合物，命名为6，7-并二氧六环[2-（1-甲酯基-1-甲基）-甲烯基]-香豆素（1）。

In the thesis a series ofβ-pyrazolyl-α,β-unsaturated Fischer carbene complexes were synthesized and structurally characterized by NMR, IR and X-ray crystallographic determinations. Based on the dynamic nuclear magnetic resonance and density functional calculation results, a three-step mechanism is proposed for the Michael type addition of pyrazoles to the alkynyl carbene complexes.

本论文合成了一系列β-吡唑基烯基卡宾化合物，并运用核磁共振动力学实验和密度泛函理论计算方法对Michael加成反应的机理及反应速率的影响因素进行了深入探讨。

A multi-element graft copolymer of starch is prepared from starch, allyl compound and water as medium through free radical graft copolymerizing reaction at 80-85 deg.

该共聚物是以淀粉、丙烯基化合物为主要原料以水为介质通过自由基聚合方法得到的产物。

The analysis on fatty acid,alcohol and ketone of oil with GC-MS method indicates that the alkyl acids,especially those with linear and saturated alkyl acids,are dominant in the newly generated acids.

采用气相色谱-质谱方法，对油样提取物中微生物产生的酸、醇、酮等物质进行了分析研究，两株菌产酸以饱和烷基酸为主，尤其以直链饱和烷基酸居多，同时也生成一定量的环烷、烯基酸和少量的芳基酸。

In the first part, thirty one new compounds, ferrocenyl aroyl hydrazones,norbornenyl aroyl hydrazones and aryl norbornoyl hydrazones, and forty threecomplexes have been synthesized, and characterized by means of IR,〓,TGA, UV-Vis spectra and molar conductance.

第一部分：共合成了含二茂铁基的芳酰腙、降冰片烯基酰腙等三十一个未见报道的酰腙类化合物，用其中部分酰腙与过渡金属盐和稀土金属盐反应合成了四十余个配合物。

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。