联基

We first examined the ability of the catalyst to promote the direct aldol reaction between acetone and 4-nitrobenzaldehyde under various conditions.

通过偶联反应将催化剂1固载到硅胶上，并将其用于催化环己酮和硝基苯甲醛的aldol反应，dr值最高达到90：10，ee最高76%。

The invention aims at improving the quality of flour to researche a method for preparing new flour modifying agent, namely, the microencapsulation glucose oxidase, chitose-calcium alginate-glucose oxidase microcapsule which is obtained through the method is copolymer hydrogel which is obtained through double cross-linking, both amidogen and carboxyl group are fixed, and the whole system is a reticular formation.

本发明以改善面粉品质为目的，研究一种新型面粉改良剂――微胶囊化葡萄糖氧化酶的制备方法，采用上述方法制得的壳聚糖-海藻酸钙-葡萄糖氧化酶微胶囊，是经双重交联得到的共聚凝胶，氨基和羧基均被固定，整个体系为网状结构。

His best season statistically came in 1997, when he was second in the American League in home runs and RBI (with 44 and 141 respectively), and finished second in AL Most Valuable Player voting. In 1998, he was hit in the upper back by Orioles pitcher Armando Benitez , which resulted in a huge brawl between the two teams.

1997年是他表现最佳的一的个球季，他在美国联盟全垒打(44)与打点(141)两个项目皆排名第二，并且在美联最有价值球员票选中排名第二，讽刺的是，这年也是洋基自1996年到2000年间唯一未获得世界大赛冠军的一年。1998年球季，Tino被金莺队投手Armando Benitez的触身球击中上背部，这也引起了两队的大乱斗。

However,aryl arenesulfonates and mesylates are attracting more interesting.

近年来，芳基磺酸酯和甲磺酸酯参与的交叉偶联反应日益受到关注。

When treated withlow-valent titanium, a five-member ring 3H,4H-cycl[3,2,2]azine wasobtained.

发现〓可以促进羰基与双键偶联生成了不常见的六元环，制得了4H，5H，5H-3-Hydroxy-cycl[3，3，2]azine。

Mikael Silvestre is confident Reds supporters will belligerently back the 21-year-old, as they have with the publicly vilified David Beckham, Eric Cantona and Roy Keane in recent years.

希尔维斯特相信曼联球迷会坚定的站在舆论的对立立场上支持这个21岁的年轻人，就像这些年他们为了贝克汉姆、坎通纳和基恩而对抗媒体一样。

In the precence of the base catalyst KF/Al2O3, the one - pot reaction of 2 -hydroxybenzaldehyde or 2 - hydroxynaphthaldehyde with ethyl α- bromoacetate,α-bromoacetophenone , 1,4 - dichloromethylbenzene , 4,4'- dichloromethylbiphenyl and 1,5 -dichloromethylnaphthalene gave the benzofuran compounds in 38-89% yield.

本文报道用 KF/Al_2O_3作为碱催化剂，由水杨醛或2-羟基-1-萘醛分别和α-溴代乙酸酯、α-溴代苯乙酮、苄基氯、4，4'-二氯甲基联苯和1，5-二氯甲基萘等进行一锅化缩合反应，以38～89％的产率合成了14种芳并呋喃化合物。

We adopted biphenyl as a core, dendrimers containing with 1, 2, 5, and 10 carbazole groups as dendrons have been successfully synthesized.

我们采用联苯作为核心，成功地合成含1、2 、5和10 个咔唑作为树枝化基元的哑铃型树化合物。

Synthesis and Property Study of 4, 4'-Bis(4-aminophenoxy)-3, 3', 5, 5'-tetramethyl Biphenyl and Polyimide Therefrom

篇名 4， 4'-双（4-氨基苯氧基）－3， 3'， 5， 5'-四甲基联苯及其聚酰亚胺的合成与性能研究

The end capper's effect was explained based on polymerization at high temperature, chain branching/crossing-linking reactions and molecular activity.

从高温再聚合、交联反应和端基活动性出发，解释了T升高和PA封端有利于提高PI薄膜热稳定性的原因。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失