异构体

The phosphoryl N→O migration reaction and ester exchange reaction on phosphorus of phosphoserine with methyl alcohol involving hexa-coordinate phosphorus intermediate 3 had been studied by MNDO method. The three isomers structures of 3 were discussed in detail based on the calculation results.

谭波用MNDO方法对磷酰化丝氨酸仿生化反应机理中所形成的六配位磷中间体(3)可能的3个异构体的结构及其反应活性进行了研究。

The hydrogen bonding of 1:1 complexes formed between acetamide and three kinds of isomers of picolines have been completely investigated using B3LYP method at various basis set levels from 6-31G to 6-31+G and 6-31++G. The results show that the interaction energies of hydrogen bond complexes between acetamide and picoline isomers have great effects on the values of h_.

2采用密度泛函理论等方法研究了乙酰胺分子分别与甲基吡啶三种异构体分子以1：1的比例形成的氢键络合物，从B3LYP/6-31G到6-31++G基组水平进行了优化，利用结合能数据讨论了焓对作用系数的差异。

Separation of organic-organic mixtures by pervaporation is discussed with emphasis on the following aspects: pola...

其中，又重点报道了有机混合液分离的最新研究成果，将其分为：极性/非极性化合物、芳香烃/脂肪烃体系、芳香烃/脂环烃体系、同分异构体、多元体系和汽油脱硫等六部分进行了详细叙述。

The ee is assessed by chiral GC and/or polarimetry.

对映异构体过量值由手性气相色谱法和/或旋光测定法测得。

Polarimetry, the measurement of optical rotation, of a pharmaceutical article may be the only convenient means for distinguishing optically active isomers from each other and thus is an important criterion of identity and purity.

药用物质的旋光测定法，即测定光学旋转的方法，也许是用于区分具有光学活性的异构体的方法中唯一简便的方法。因此，该方法是鉴别和纯度的一个重要标准。

Only the major Isomers be displayed in the attacks of propylene oxide was replaced by the less carbon.

只有主要位置异构体被显示攻击在环氧丙烷较少被取代的碳。

Objecdt ive Synthesis of molecularly imprinted polymer membrane to separate racemate of amino acid hydantoins.

合成了可对氨基酸海因对映异构体选择性分离的分子印迹聚合物膜。

This intermediate is responsible for the stereoselective nucleophilic substitution and the subsequent racemization of 3-EtO-NDZ enantiomers in acidic ethanol.

该中间体导致了3-EtO-NDZ对映异构体在酸性乙醇中所发生的立体选择性亲核取代反应及随后的消旋过程。

These results show that PIP has only one thermodynamically stable disulfide linkage, and the non-natural disulfide isomers could refold in vitro efficiently to from native PIP.

观察到PIP只有一种热力学稳定的二硫键配对方式，PIP的非天然二硫键异构体在巯基试剂存在的条件下可以高效转化为天然二硫键配对。

Furthermore, the value of E〓 was found to be strongly dependence on the orientation of the cluster relative to the surface.

我们的研究表明，虽然三种异构体的结合能相近，但是它们在表面化学吸附的阈能有很大差别。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐