中间体

The present calculations demonstrate that O－ associates quickly with C2H4 to form ion-induced dipole complex, which can subsequently isomerize and decompose to various products, corresponding to molecular anions dissociation and associative electron detachment pathways, respectively.

计算结果表明， O－与C2H4经碰撞快速复合形成离子诱导偶极络合物中间体，然后经历异构化、解离生成各种产物，分别对应分子离子异构解离与复合电子剥离反应通道。

The present calculations demonstrate that O(superscript -) associates quickly with C2H4 to form ion-induced dipole complex, which can subsequently isomerize and decompose to various products, corresponding to molecular anions dissociation and associative electron detachment pathways, respectively.

计算结果表明，O与C2H4经碰撞决速复合形成离子诱导偶极络合物中间体，然后经历异构化、解离生成各种产物，分别对应分子离子异构解离与复合电子剥离反应通道。

Oxo-isophoroneprepared by isophorone oxidation is an important intermediate of synthesis of vitamin E.

氧代异佛尔酮是合成维生素E的重要中间体，它可以通过异佛尔酮氧化生成。

In this paper,several synthesis methods of isothiocyanates were summarized as well as its application in synthesis of compound and biotechnology.

异硫氰酸酯作为一类重要的有机合成中间体，其制备及应用受到广泛关注。

As a kind of important intermediates, glycosyl isothiocyanates have been applied in the preparation of new compounds possessing considerable bioactivities.

作为一类重要的有机合成中间体，糖基异硫氰酸酯广泛地应用于具有生理活性化合物的制备。

In this paper, the structures and the synthesis methods of glycosyl isothiocyanates are summarized, including the application as intermediates in the preparation of glycosylthioureas, glycosylheterocycles, glycosylguanidins and glycosylconjugates and so on.

本文对糖基异硫氰酸酯的结构、制备方法，以及作为中间体在糖基硫脲、糖基杂环、胍基糖苷、糖基缀合物等重要化合物的合成中的应用作了较详尽阐述。

On the basis of isotopic substitution experiments and theoretical calculations, various reaction ...

结合同位素取代实验和量子化学理论计算，对反应产生的活性中间体和产物进行了归属，并探讨了相关的反应机理。

Two isoxazole intermediates containing 1,2,3triazolyl and carbonyl ,which can also be used as intermediates for synthesis of new heterocyclic compounds,have been synthesized.

以2-苯基-1，2，3-三唑-4-甲醛为原料，合成2种在异噁唑环上同时含有1，2，3-三唑基和羰基的新型化合物，它们可作为合成其他杂环化合物的中间体，其分子结构经IR，1HMR，MS谱确证

Key words Pyrethroid, Isoxazole, Insecticide, Synthesis, Bioactivity

张田林 男，38，教授，博士，主要从事医药中间体合成及有机溴阻燃剂的研制。

The dissertation mainly consists of two parts:1. The Reaction Chemistry of Alkynes under Palladium Catalysis Part 1 studies the reaction α,β-unsaturated carbonyl compounds with alkenylpalladium intermediate generated by nucleopalladation, and discovered 1 the Pd-catalyzed tandem addition reaction of halides, alkynes and α,β-unsaturated carbonyls,2 the four-component tandem addition reaction of halides, alkynes and α,β-unsaturated carbonyls, 3 the tandem intramolecular oxypalladation-conjugate additionreaction of alkynoic acids with α,β-enals. These new reactions provide notonly efficient highly stereoselective methods for the synthesis of γ,δ-unsaturated,polyunsaturated carbonyl compounds and γ-lactonic aldehydes, but also thebasic transformations for a number of C-C bond formation reactions which can be usedto design synthesis of many acyclic, cyclic or polycyclic compounds.

本论文的主要工作分为两个部分：一、钯催化下炔烃的反应化学在本小组前人工作的基础上，我们详细研究了炔烃亲核钯化产生的烯基钯中间体与α，β-不饱和羰基化合物的反应，发现两价钯催化下卤离子-炔烃-α，β-不饱和醛酮的串联加成反应、卤离子-炔烃-α，β-不饱和醛酮的西组分串联加成及炔酸分子内氧钯化-串联Michael型加成反应；由此发展了γ，δ-不饱和醛酮、多不饱和羰基化合物和带有醛酮基侧链的γ-丁内酯衍生物的高立体选择性合成方法，这一过量卤离子存在下的烯基钯对α，β-不饱和羰基化合物共轭加成反应的发现，为大量碳-碳键形成反应的实现提供了基础，使我们能够从这一基本反应出发，设计和开发多种分子内、分子间的碳碳成键反应，以好的立体、区域选择性组建开链、环状及多环类型的化合物。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。