The Soft-Hard Acid-Base Theory was used to interpret the experimental results for the first time, the softness of sulfur, which was a Lewis base, was changed by solvents, and the reactivity of sulfur atom was changed.
结果表明，砷化镓表面硫化层厚度与所用溶液的极性有关，用极性小的有机醇作溶剂可以得到更厚的硫钝化层。
Linear dimerization of isoprene to form myrcene; 2. Synthesis of Unsaturated Cyclothioethers byCycloaddition Reactions of Myrcene; 3. The traditional synthesis is by the way of Diels-Alder reaction of myrcene with acrolein over Lewis acid catalysts in organic solvent.
二烷基咪唑或烷基吡啶卤化物与ZnCl2 构成一类新型的具有Lewis酸性的离子液体，以其为催化剂和反应介质，通过月桂烯与丙烯醛的Diels Alder反应高区域选择性地合成了对位柑菁醛。
This thesis is constituted by four parts: In the first part a summarization is given on the main total synthetic methods of isoflavones, for example, deoxybenzoin method which generally involves two steps wherein a phenol is reacted in the presence of a Lewis acid with phenylacetic acid to generate an intermediate deoxybenzoin which is then cyclized with a one carbon electrophile.
本论文主要工作包括四部分：第一章综述了近年来全合成异黄酮的主要方法：脱氧安息香法，是以多羟基苯酚与苯乙酸或苯乙腈在Lewis酸存在下，反应生成中间体脱氧安息香，然后再与亲电碳试剂进行关环反应生成异黄酮。
Acetylation between alcohol and benzoyl oxide was carried out using ZnBr2 as a Lewis acid catalyst in solvent-free condition. Some structures were characterized by NMR and IR.
以溴化锌为催化剂，在无溶剂条件下实现了醇与苯甲酸酐的酰化反应，部分产物经NMR和IR表征。
The mixtures or monomer-Lewis acid complexes may be polymerized to produce the desire stereoregular vinyl polymers.
该混合物或单体-路易斯酸配合物可以聚合成所需的有规立构乙烯基聚合物。
They were discussed that the shortcomings and virtues of some denitrogenation technologies, such as acid refining, solvent refining, complexing refining, sorbent refining, and their combination, as well as biodenitrogenation and microwave treatmemnt denitrogenation. Aiming at above shortcomings, a new denitrogenation method was invented. Based on Lewis theory of acids and bases and similarity law, metal cation styrene resins, solid phase extraction sorbents for basic nitrogen compounds removal from diesel fuel, were prepared.
本文在综述石油脱氮技术的现状，指出加氢脱氮、酸萃取精制、溶剂精制、配合法精制脱氮、吸附剂法脱氮、组合脱氮，以及目前处于研究试验阶段的生物脱氮和微波脱氮技术的优缺点及其发展前景，在此基础上，有所创新，巧妙利用固相萃取和配位脱氮的优点，发明一种新的组合脱氮的方法—固相配位萃取脱氮，该法能有效脱除油品里碱性氮。
The amount and strength of acid decreased and that of basicity increased while KY zeolite was impregnated with alkali metal oxides. The alkali metal halides promoted KY zeolites have weak Lewis acid centres and moderate strong lewis basicity centres. The C〓 products containing much styrene were gained over alkali metal bromides promoted KY zeolite catalysts. It was found the most effective catalytic systems were KY promoted with NaBr.
2浸渍碱金属氧化物后，KY分子筛的酸量及酸强度均减小，而碱强度及碱量均有不同程度的增大；浸渍碱金属卤化物后KY分子筛催化剂仍具有一定量的弱L酸中心及相当量的中等强度的碱中心；(3)以碱金属溴化物为助剂的分子筛催化剂可以获得高苯乙烯含量C〓的产物，尤以NaBr/KY催化剂，其C〓产物中苯乙烯含量高。
The rate enhancement in homogeneous Suzuki reaction by Lewis acid has been investigated.
研究了Lewis酸在Suzuki反应中的促进作用，考察了Lewis酸、溶剂及碱性试剂对目的产物收率的影响，并优化了反应条件。
The amount and strength of Lewis acid of titania/silica decreased with increase of content of silica.
含锑的化合物由于可能会对环境和人体造成危害，而引起人们的广泛关注。
Different from the Lewis acidity nature of SO4(superscript 2-)/ZrO2/MCM-41, SO4(superscript 2-)/TiO2 and S2O8(superscript 2-)/TiO2 behave mainly Brnsted acidities. The strongest Brnsted acid sites are formed on SO4(superscript 2-)/TiO2 promoted with H2SO4, while Lewis acid sites on S2O8(superscript 2-)/TiO2 are even stronger than those on SO4(superscript 2-)/ZrO2/MCM-41, and the former which are generated when persulfate solution is used as sulfating agent.
与SO4(上标 2-)/ZrO2/MCM-41主要表现为Lewis酸性不同，SO4(上标 2-)/TiO2和S2O8(上标 2-)/TiO2主要以Brnsted酸性为主，其中采用硫酸为促进剂制备的SO4(上标 2-)/TiO2具有最强的Brnsted酸性，而采用过硫酸根作为促进剂则使S2O8(上标 2-)/TiO2产生较SO4(上标 2-)/ZrO2/MCM-41更强的Lewis酸中心。
Chiral Lewis acid catalyzed Friedel-Crafts alkylations of pyrrole with 4-oxo-EnoatesThe effects of ligand、solvent、temperature and esters group on the pyrrole with a varity 4-oxo-Enoates reactions have been examined.
论文通过研究配体、溶剂、温度以及酯基对吡咯和4-氧代丙烯酸酯类化合物的不对称的Friedel-Crafts烷基化反应的影响。
Because substituted anilines have Lewis acid or Lewis base group, extractions with complexing agent was conducted.
由于取代苯胺都具有Lewis酸性或Lewis碱性官能团，采用相应的络合剂进行了络合萃取的研究。
In the second part, the first example of Lewis acid catalyzed 1, 3-cycloaddition between nitrones and alkylidene malonates was developed by using trisoxazoline 63 and Co〓.
催化剂的用量可降至1-2mol％。在论文的第二部分，我们首次研究了Lewis酸催化的硝酮与丙二酸酯类衍生物的1，3-偶极加成反应。
Due to the different preparation processes and particle sizes, the samples show obviously different Lewis acid-base properties. Fine TATB can provide positive Lewis acid-base active sites and has higher acidity. The specific components of the adsorption of polar probes on the surface of the other three types of TATB were found to be endothermic owing to the strong hydrogen bond of inter- and intra-TATB molecules.
由于制备方法不同和粒子大小的差异，4种TATB的表面酸碱性质显示了明显的差别，细颗粒TATB表面有较强的亲电子特性；而其他3种TATB在极性探针分子的作用下的吸附均表现为吸热吸附，表现出在分子内和分子间具有强烈的相互作用，其Ka和Kb值均为负。
Moreover, the increase of adsorption capacity of thiophene was much relative with the strength and density of Lewis acid.
噻吩吸附容量的提高与Ce-MCM-41的Lewis酸的酸强度及酸密度有直接关系。
Friedel-Crafts acylation reaction of crosslinked polystyrene microspheres was conducted in the precence of a Lewis acid catalyst at room temperature using two kinds of ω-chloroacyl chloride, chloroacetyl chloride and chlorobutyryl chloride, and chloroacylation crosslinked polystyrene microspheres were prepared. The chemical structure and composition of the resultant microspheres were characterized and determined by means of infrerad spectroscopy and Volhard methods. The effects of various factors on the chloroacylation reaction were investigated.
采用ω-氯代酰氯试剂氯乙酰氯和氯丁酰氯，在Lewis酸催化剂存在下，于室温下分别与交联聚苯乙烯微球进行了Friedel-Crafts酰基化反应，制备了氯代酰基化(chloroacylation，CA)的交联聚苯乙烯微球，用红外光谱与佛尔哈德分析法表征了产物的化学结构与组成，研究了各种因素对反应过程的影响。
The properties of a protic and non-specific enzymare compared with those of protic acid and specific enzyme.
比较了质子酸与Lewis酸，专一性酶与非专一性酶对纤维素降解的催化特性。
Metoprolol was synthesized with isopropylamine and 4-(2-methoxyethyl)phenyl glycidyl by different Lewis acid.
Lewis酸催化对甲氧乙基苯基缩水甘油醚与异丙胺的反应得到美托洛尔，考察不同的催化剂、反应温度、反应时间对反应的影响。
The organic reactions mediated by high valent groups 5 and 6 metal chlorides were reviewed in this paper, including (1) the chlorination of alkanes, alkenes and alkynes by group 5/6 metal halides; (2) the reactions using group 5/6 metal halides as Lewis acid catalysts; (3) metathesis reaction of alkenes and polymerization of alkynes; (4) MoCl5 mediated oxidative coupling reaction of aromatic compounds and (5) formation of thioethers and ring-expansion reactions.
郭巧霞，申宝剑*摘要：从制备化学的角度，对包括作者本人的研究工作在内的由第5/6副族高价过渡金属氯化物参加的有机反应进行了综述。内容包括以下几个方面：(1)烷烃、烯烃和炔烃与第5/6副族高价过渡金属氯化物的卤化反应；(2)作为Lewis 酸催化的反应；(3)烯烃歧化反应及炔烃的聚合反应；(4) MoCl5参与的芳烃氧化偶合反应；(5)硫醚化及扩环反应。
The results indicated that the amounts of both Brnsted and Lewis acid sites were decreased with the increase of modification temperature.
结果表明，随着氟硅酸铵处理温度的提高，HMCM-22分子筛的B酸和L酸中心的酸量均逐渐减少。