1.
The Explanation of Substitution of Reaction s Fixed Position Rule of the Benzene Cyclie by HMO Method;
HMO法对苯环上取代定位法则的解释
2.
This thesis, through the change of the chemical shift values of aryl protons, predicts the directing effect of the substituenfs of aromatic systems and the strong and weak levels of aromatic etectrophilic substitution reachions.
通过苯环上芳氢化学位移的变化,判断苯环上取代基的定位效应及苯环亲电取代反应的强弱.
3.
The fluorescence intensity of porphyrin also relates to the substituent positions on the phenyl groups.
此外,荧光强度还与卟啉的苯环上取代基的取代位置有关。
4.
Study of Nucleophilic Substitution Reaction of C-F Bond on a Benzene Ring under Activation of Hydrogen Bond
氢键活化的苯环上C-F键的亲核取代反应研究
5.
One of the hydrogen atoms of the active methylene group is replaced with a cyclooxy group.
活性亚甲基上的一个氢原子是被环氧基所取代的。
6.
Flett has examined a series of anthraquinones with various substituents on the ring.
福莱特测试了一系列环上具有不同取代基的蒽醌。
7.
In other words, replacement of the number 8 carbon by nitrogen in the purine ring does not eliminate activity.
换句话说，嘌呤环上第8位碳被氮所取代并不丧失活性。
8.
Elimination of an alkyl chain substituted on an aromatic ring results in the appearance of free radicals.
在一芳香环上一个取代烷链的消失，结果出现自由基。
9.
Methods and Results Through the reaction of alkylation of substituted phenols, hydrolysis and cyclization,“ vicarious nucleophilic substitution of hydrogen( VNS)” was used to synthesize4- hydroxyindole and4- methoxyindole, the method is simple and the cost is low.
方法通过取代酚的醚化,再在苯环上直接引入腈乙基,然后水解、合等反应,直接生成吲哚衍生物。
10.
Like the amino group, the phenolic group powerfully activates aromatic rings toward electrophilie substitution, and in essentially the same way.
对于亲电取代反应，酚基基本上以同氨基一样的方式使芳环强烈活化。
11.
Gas Chromatographic Enantioseparation of Some Substituted Benzene Chiral Compounds on Mixed Stationary Phases of Peralkylated β-Cyclodextrin
全烷基化β-环糊精混合固定相上一些取代苯类手性化合物的气相色谱分离研究
12.
Bridged bicyclooctanes gave no significant bridgehead substitution.
桥二环辛烷不给出有意义的桥头取代。
13.
The prefixes cis and trans are frequently applied to disubstituted cycloalkanes.
词头顺和反常用于双取代的环烷烃。
14.
A Tandem Reformatsky-Cyclization Reaction to Synthesize Substituted Tetrahydrofurans;
Reformatsky-环化反应合成取代四氢呋喃
15.
Synthesis of Bicyclic 4H-1,2-Oxazine Derivatives
取代双环4H-1,2-噁嗪衍生物的合成
16.
The Synthesize and Separation of Bromine Methyl Substitution Cucurbit;
改性瓜环—溴甲基取代瓜环的合成及分离
17.
Synthesis of Heterocyclic and Fused Ring Compounds Containing Phenylethynyl Groups;
苯乙炔基取代的杂环及稠环化合物的合成
18.
It had largely replaced moral judgements.
事实上它已取代了道德上的概念。