反式

The chemical composition of th essential oil from Illicium verum Hook.f.was determined by the means of GC-MS.

采用GC-MS对八角茴香挥发油的化学成分进行分析，其中反式茴香醚的含量最高。

Since many phenylvinyl ketone derivatives showed a certain anti- inflammatory activity, the indolyl group is introduced to this skeleton, and thus a series of 1, 4-penten-3-one derivatives characteristic of the structures of both phenylvinyl ketone and indole have been synthesized and characterized by elemental analyses, MS, UV-vis, and 〓 NMR as well. All these compounds are found to be trans-isomers.

考虑到苯乙烯酮类化合物的抗炎活性，本文将吲哚基团引入到该类化合物上，设计合成了一系列新的兼具苯乙烯酮和吲哚二者结构特征的1，4-戊二烯-3-酮衍生物Al-A24，并对其进行了表征，发现所有这些化合物均为反式构型。

The performance of this catalyst for the cross-coupling reaction of iodobenzene with acrylic acid was studied.

研究了该催化剂对碘代苯与丙烯酸交叉偶联生成反式－肉桂酸的催化性能。

The Effect of different reaction conditions (solvent, reaction temperature, molar ratio of iodobenzene and acrylic acid, kind and amount of base, amount of catalyst, reaction time) on the yield was investigated. The suitable condition of the reaction was obtained.

考察了不同反应因素（溶剂、温度、原料比、缚酸剂及其用量、催化剂用量、反应时间）对反应的影响，确定了该催化剂对碘代苯与丙烯酸交叉偶联生成反式－肉桂酸的适宜反应条件。

Its catalytic performance for Heck arylation of acylic acid with iodobenzene shows that the catalyst has catalytic activity and regioselectivity for the synthesis of trans-phenylacrylic acid.

结果表明该催化剂具有较高的催化活性和立体选择性，可高转化率、高产率地合成反式苯丙烯酸；通过简单的过滤、溶剂洗涤回收催化剂，并能多次重复使用。

The results indicate that little conversion of iodobenzene was observed on unmodified carrier supported catalysts; and a conversion of 100% and a selectivity of above 98% to trans-isomers were found over 10%Cu/5%KF/ZnO, 20%Cu/10%KF/ZnO.

结果表明，对碘苯与丙烯酸正丁酯的Heck反应的催化性能，未改性催化剂基本没有活性，而改性后，10%Cu/5%KF/ZnO、20%Cu/10%KF/ZnO催化剂的催化转化率为100%和反式异构体的选择性为98%以上。

This thesis sets up a new method to synthesize stereoselectively ?ra玸--2,5-disubstituted tetrahydrofurans by introducing two alkyl groups in 3-C and 5-C of lactol, flash decomposition and hydrogenation.

本文独创新的合成方法：以-乳醇，即-4，10-二氧杂三环[5.2.1.0~(2，6)]-癸-8-烯-3-醇为原料，在其3-位和5-位先反向引入两个取代基，再经过热分解和催化加氢反应，高立体选择性地合成反式-2，5-二取代四氢呋喃。

The key problem is to synthesize high stereoselectively trans- 2,5- disubstituted tetrahydrofurans. This thesis sets up a new method to synthesize stereoselectively ?ra玸--2,5-disubstituted tetrahydrofurans by introducing two alkyl groups in 3-C and 5-C of lactol, flash decomposition and hydrogenation.

本文独创新的合成方法：以-乳醇，即-4，10-二氧杂三环[5.2.1.0~(2，6)]-癸-8-烯-3-醇为原料，在其3-位和5-位先反向引入两个取代基，再经过热分解和催化加氢反应，高立体选择性地合成反式-2，5-二取代四氢呋喃。

Was applied to the AD reaction of eight olefins in PEG/NMO system according to the protocol of ligand 8. The yields and ees of the diols were 70～90% and 77～96%(except for trans-5-decene and ally naphthyl ether) respectively.

在与8相同的催化反应条件下，手性配体9催化八种烯烃的AD反应得到的化学产率和ee值分别为70～90％和77-96％（反式-5-癸烯和萘基烯丙基醚除外）。

The yields were 67～89% and 61～90% respectively, and the ees were 66～99. 9% and 68～99. 9% respectively (except for trans-5-decene and ally naphthyl ether). With trans-stilbene as the substrate, chiral ligands and OsO〓 could be recovered and reused five times in the AD reaction with high catalytic activity and stereoselectivity.

4在PF〓/NMO体系中，将配体8和10分别用于八种烯烃的AD反应，配体、OsO〓和底物的摩尔比为0.02/0.015/1时，化学产率分别为67～91％和61～90％，ee值分别为66～99.9％和68～99.9％（反式-5-癸烯和萘基烯丙基醚除外）。

And Pharaoh spoke to Joseph, saying, Your father and your brothers have come to you.

47：5 法老对约瑟说，你父亲和你弟兄们到你这里来了。

Additionally, the approximate flattening of surface strip using lines linking midpoints on perpendicular lines between geodesic curves and the unconditional extreme value method are discussed.

提出了用测地线方程、曲面上两点间短程线来计算膜结构曲面测地线的方法，同时，采用测地线间垂线的中点连线和用无约束极值法进行空间条状曲面近似展开的分析。