异构体

In addition, NBO analysis shows that it is hyperconjugation rather than repulsive forces that plays a key role in the relative stabilities of isomers.

此外， 通过NBO方法分析了分子的超共轭作用和立体排斥能对异构体稳定性的影响，结果表明超共轭作用是影响各异构体构型相对稳定性的主要因素。

Isomerism is very important because enzyme specificity restricts viable organisms to the use of only one of the two forms.

异构现象是非常重要的，因为酶的特异性限制生物体都只能使用两种同分异构体中的一种。

Isomerism is very important beca use enzyme specificity restricts viable organisms to the use of only one of the two forms.

异构现象是非常重要的，因为酶的特异性限制生物体都只能使用两种同分异构体中的一种。

The composition of isomerization product is very similar to that of commercial products.

不同的反应介质决定了异构化产物中c9，t11-和t10，c12-异构体的比值。

Because the components of isomerization products are complex and the boiling points of mostly isomers are similar, separation of mesitylene is extremely difficult and give low yield.

由于异构化生产均三甲苯的产物组成比较复杂，多为同分异构体，许多组分的沸点非常相近，分离十分困难，且产品纯度低。

The difference of NDP kinase activity and DNase activity among NDPK-A wild type and NDPK-A isomers were analyzed.

通过本文研究：(1)成功构建并制备了大量NDPK-A异构体，为NDPK-A结构异构与生物活性关系的后续研究做好了准备。

For Nitro derivatives of methylbenzenes, the pyrolysis initial reaction is an isomerization reaction. It means the alpha C-H bond in methyl rupture, then the Hydrogen atom transfer to the Oxygen atom in nitryl to form isomer.

甲苯的硝基衍生物的热解引发反应为异构化反应——α_中的C-H键断裂，氢原子转移到邻位硝基(-NO_2)中的氧原子上，生成新的异构体化合物。

Three stable structures of the dimer and trimer have been obtained by the optimized geometries and frequencies calculation.

构型优化和频率计算得到3个稳定的二聚体和三聚体氢键异构体。

The yields and ees obtained in the AD reaction of eight olefins utilizing 10 in PEG/NMO system were 72～90% and 79～96%(except for trans-5-decene and ally naphthyl ether).

3配体10和配体8是一对假对映异构体，在AD反应中立体选择面相反，可得到相反构型的产物。

The central 5, 5'-disubstituted bipyridine units of each ligand coordinate theNi or Fe ion, while all the terminal 6-monosubstituted bipyridine units of the ligands keep free of coordination, as the result trinuclear triple-stranded helicate 〓 can not form. This is considered to be caused by the steric hindrance of the methylene substituents α to the chelating nitrogens of the terminal bipyridine units and the strain caused by linkage mode.

配体L〓与Ag作用得到〓，两个配体链相互缠绕着两个Ag离子周围形成双股螺旋结构并以头尾式排列(见图3)，由于配体中位于配位N原子α或β位的末端甲基或次甲基取代基的空间位阻阻碍了头对头式异构体的形成，也正是由于配体头尾式排列而使Ag双股螺旋得以形成，这一结果表明该螺旋体的组装过程中自发地采取了空间阻碍尽可能小的那个构型。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。