查询词典 reaction ring

Ring closure reaction of dodecene was first time carried out in ethanol buffered ionic liquids with high selectivity to cyclododecane.

首次在氯铝酸离子液体反应介质中，研究了醛和酮与甲醇的缩合反应。

Chemically speaking, 3HAO is an important enzyme that catalyzes the aromatic ring opening reaction.

在化学的意义上，3HAO扮演著把芳香环氧化开环的酵素。

Theconclusion is that high excess and the rapid dropping of ethyldiazoacete to the reaction system prefer a five-membered ring product.

其次，我们该变了反应条件，得到了有旋光性的Ⅴ和Ⅵ，同时又作了在铜粉、〓等条件下的反应。

The MS data for protected amino acidsindicated a new rearrangement reaction via five-membered ring intermediate in ESIfragments.

在对模型化合物的质谱研究中，发现保护氨基酸单体的一个新的经由五员环中间体的ESI-MS碎片重排反应。

In the second part, a fully functionalized C-ring synthon was synthesized by asuccessful use of a known intramolecular Diels-Alder reaction.

第二部分我们运用一已知分子内DielS-Alder反应成功地进行了官能化的Taxol C环片断的合成。

In this reaction, DMSO may act as a Lewis base to activate the nucleophile, which facilitates the ring-opening reactions.

与此同时，我们还发现在DMSO中，无催化剂的中型条件下，硫，胺以及各类硅亲核试剂可以对氮杂环丙烷化合物开环。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。