不反应的

Ee value was achieved when acetophenone was chose as the substrate under the optimal condition.

研究了该催化剂催化的以苯乙酮为底物的不对称硅腈化反应，在最佳反应条件下得到了69%的ee值。

These ligands were found to be very effective in construction of quaternary carbon centers by using asymmetric allylic alkylation.

这类配体在前手性亲核试剂的不对称烯丙基化构筑手性季碳中心的反应中，显示了较好的反应活性及对映选择性。

The ligands were found to be effective in palladium-catalyzed asymmetric allylic alkylation to construct chiral quaternary carbon center.

这类配体在前手性亲核试剂的不对称烯丙基化构筑手性季碳中心的反应中，显示了较好的反应活性及对映选择性。

During the process of grafting reaction, long chain branched structures were not formed until enough styrene was polymerizaed.

反应时间对长支链的形成影响比较大，反应时间在10min以内所得产物的支化效果都不明显，经历20min以上聚合后产物含有明显的长支链结构。

METHODS: Inexpensive quinine and cinchonine were transformed to 9NH2quinine and 9NH2cinchonine, which reacted with 4chlorobenzoyl chloride to afford 2 novel chiral ligands. The AD reactions of olefins were performed in H2OtBuOH (1∶1) using the 2 ligandsK2OSO24 as catalysts.

以价廉易得的奎宁和辛可宁为原料，经过结构转换得到9氨基奎宁和9氨基辛克宁，进而与对氯苯甲酰氯反应制得两种新型手性配体，并将其用于锇催化的烯烃的不对称双羟化反应。

In the process of converter smelting, a fair quantity of iron oxide ball with high grade, low moiwture content and low in purity is added to converter instead of ore as the adjusting agent of temperature and slag.

在转炉冶炼过程中向炉内试验加入一定量的含铁品位高、水分少、杂质低的氧化铁球来代替矿石，作为转炉调温调渣剂，结果表明，加入氧化铁球后，转炉反应平稳，调渣迅速，不会产生剧烈反应造成喷溅，并有利于提高金属收得率。

When the molar ratio of tungstic acid∶acidic organic additive∶cyclohexene∶ hydrogen peroxide was 1∶1∶40∶176 (tungstic acid, 2.5 mmol) and the tungstic acid/resorcinol used as catalyst, the isolated yield of adipic acid was up to 90.9% for 8 h.

当使用磺酸水杨酸、草酸、水杨酸为有机酸性添加剂时，随反应时间的增加，己二酸分离产率均升高，但反应 6 h 以后，己二酸分离产率随时间的变化不明显。当磺酸水杨酸用量为 2.5 mmol 时，己二酸分离产率和纯度均较高。

SnSO_4 shows high catalytic activity in the dehydration of ethyl acetate and the esterification of succinic acid.

其次，SnSO_4在这三个液相有机反应中的稳定性均不如其在对苯二酚烷基化反应中的稳定性。

Dry distillation, despite its name, is not truly distillation, but rather a chemical reaction known as pyrolysis in which solid substances are heated in a strongly reducing atmosphere and any volatile fractions are collected.

干馏，尽管名称如此，但实际上不是蒸馏，而是一种广为人知的热分解反应，反应中，固体物质在强烈的减压状态下受热，任何挥发性组分都被收集下来。

However, using tributylphosphine as a Lewis base and -1, 1'-bi-2-naphthol as a cocatalyst, the Baylis-Hillman reaction of arylaldehydes with cyclopent-1-en-one proceeded smoothly.

在本论文主要对磺酰亚胺和各种活化烯的aza-Baylis-Hillman反应以及它们的不对称aza-Baylis-Hillman反应进行了研究。

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。