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- Electronic effect and Amromatic transitun can used to explain electrophilic substitute reaction of Heterocyclic Compounds. This thesis extra explain that thestable of link influence to the reaction. 本文试图从传统电子效应及芳香过渡态正离子稳定性角度,对五元杂环化合物代表物:呋喃、吡咯、噻吩的亲电取代反应难易程度作了解释。同时,扩展了环稳定性对反应活性的影响。
- It will become deepen to the students' recognization in mechanism of Aryl electrophilic substitution. 这些问题的讨论将深化学生对芳烃亲电取代反应机理的认识。
- The aromatic electrophilic substitution reaction was studied using NMR for the first time. 首次采用NMR研究芳基亲电取代反应。
- By comparing VNS with the electrophilic substitution and nucleophilic substitution of nitro aromatic, the definition of VNS is explained. 通过对竞比实验、速控步骤和动力学同位素效应的分析,解释了VNS的反应机理;
- The treatise advances a new method to judge two kinds of fixed group of benzoic ring on electrophilic substitutive reaction in benzoic ring. 对苯环上的亲电取代反应提出一种判断苯环上两类定位基的新方法。
- Electrophilic Substitute Reaction of Penta-heterocycllic Compounds 五元杂环化合物的亲点取代反应
- Reactivity of electrophilic substitutions of different positions on phenanthrene are discussed according to the theory of Resonance,PMO method and EHMO method. 利用共振论、PMO法、EHMO法;对菲亲电取代反应各位点的活性进行了解释.
- In this paper, bromized polystyrene flame retardant was synthesized by electrophilic substitution of waste polystrene with bromine using aluminium ehlorid as catalyst. 本文利用三氯化铝作催化剂,废聚苯乙烯与溴发生亲电取代反应合成溴化聚苯乙烯阻燃剂。
- Condensed Fukui function(CFF)was used to predict the reactive sites in electrophilic substitution ofpenta-heterocycles(pyrrole and furan),hexa-heterocycle(pyridine)and a series of mono-substituted heterocycles(ortho-,meta-and para-). 采用收敛的Fukui 函数对传统杂环和其单取代产物在亲电取代反应中的活性部位做了预测。 研究体系为传统的五元(呋喃、吡咯)和六元杂环(吡啶)以及取代基在邻位,间位和对位(相对于杂原子)的单取代杂环。
- Keywords Electrophilic substitute reaction;Electronic effect;Conjugative system; 关键词亲电取代反应;电子效应;共轭体系;
- unimolecular electrophilic substitution 单分子亲电取代
- electrophilic substitution reaction 亲电取代反应
- mechanism of bimolecular electrophilic substitution [化] S-E2机理; 双分子亲电子取代反应机理
- Water is not a proper substitute for wine. 水不是酒的适当代用品。
- bimolecular electrophilic substitution 双分子亲电取代
- Only art can substitute for nature. 唯有艺术能代替自然。
- Honey can substitute for sugar in this recipe. 在这个食谱中，可用蜂蜜代替食糖。
- This type of vinyl is a poor substitute for leather. 这种乙烯基材料代替皮革十分勉强。
- Keywords AM1 method;charge distribution;electrophilic substitution; AM1方法;电荷分布;亲电取代;
- mechanism of unimolecular electrophilic substitution [化] S-E1机理; 单分子亲电子取代反应机理
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