查询词典 lewis

Alkylamine reaction with dialkyl cyanodithioiminocarbonate was catalyzed by quaternary ammonium salts at room temperature to yield 3-alkylamine-5-amino-1,2,4-triazole in good quality and high yields. After imidization and reaction with an α,β-unsaturated acid derivative, the reaction intermediate was hydrolyzed in the presence of a Lewis acid to obtain the target product.

烷基胺与氰基亚胺硫代二甲酯在季氨盐催化作用下得到质量好、收率高的3-烷氨基-5-氨基-1，2，4-三氮唑，进一步经过亚胺中间体并与α，β-不饱和酸酯作用后，中间产物在Lewis酸催化作用下水解得到三唑嘧啶酮。

By analyzing the differences between acidic and basic catalytic action in this transesterificatios, it is considered that the main cause of yielding an anisole by-product is due to the basic catalysis, a Lewis acidic catalyst is helpful for the selective DPC formation.

通过分析酸碱催化作用在酯交换反应中的差异，认为碱催化是副产物苯甲醚生成的主要原因，Lewis酸性的催化剂有利于碳酸二苯酯的高选择性。

Pat Lewis is a school nurse in Beaumont, Texas.

Pat Lewis 是德克萨斯州博蒙特的学校医护人员。

Furthermore, the polymerization of benzonitrile catalyzed bydifferent Lewis acid and zinc was also investigated.

测定了以Lewis酸和几种金属催化苯甲腈聚合的反应速度，结果表明金属的活性次序为：镁＞锌＞钠＞钙。

Perhaps the character of Joy, played by Debra Winger in the biopic about the life and one true love of C S Lewis, put it best when she said"The pain then is part of the joy now. That's the deal"Shadowlands, 1993

或许Debra Winger在一部记录C S Lewis生活及其挚爱的影片中饰演的Joy这个角色能对此作出最恰当的解释，她在影片中说，痛苦也是快乐的一部分，这就是生活。

Since Brander and Lewis began their research in 1986, there have been three major reviews

从1986年Brander和 Lewis 开创性的研究以来，理论界发展出以下三种主要观点，即负债促进了市场竞争的观点、负债减弱了市场竞争的观点和掠夺理论。

After Carl Lewis won the gold medal for the long jump in the 1996 Olympic games, he was asked to what he attributed his longevity, having competed for almost 20 years. He said,"Remembering that you have both wins and losses along the way. I don't take either one too seriously."

在Carl Lewis获得1996年奥运会跳远冠军后，有人问他是什么使得他在该领域如此长青，他回答说，"永远记住，一路走来既有成功也有失败，我从来不把它们中的任何看得过于重要。"

Alice in Wonderland: The Looking Glass-station name and DHARMA symbol are a clear reference to "Alice's Adventures in Wonderland" and "Through the Looking Glass, and What Alice Found There" by Lewis Caroll.

爱丽丝梦游仙境：窥镜舱的名字和DHARMA的象征（一个白色的兔子和一个洞）明显涉及"爱丽丝梦游仙境，爱丽丝透过镜子，发现了那里"，这本书是Lewis Caroll写的。

The rate enhancement in homogeneous Suzuki reaction by Lewis acid has been investigated.

研究了Lewis酸在Suzuki反应中的促进作用，考察了Lewis酸、溶剂及碱性试剂对目的产物收率的影响，并优化了反应条件。

The role of the oxidant Ce4 in these reactions seemed ambiguous as it could also act as a Lewis acid.

在这个反应中，由于Ce4作为氧化剂的同时又兼具Lewis酸的酸性，因此，在反应的探索过程中，我们一直无法确定到底是Lewis酸催化的离子反应还是电子转移引发的自由基反应接离子反应。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。