查询词典 lewis acid

Ethene can be chemisorbed on the Lewis acid sites Fe〓 by the C=C double bond.

乙烯分子可通过C=C双键吸附在催化剂表面的Lewis酸位Fe〓上。

In this paper, the catalyst which consists of different concentration of H_2SO_4, HAc and the liquid Lewis acid, which was used to catalyze Blanc chloromethylation.

本文报道了一种由液体Lewis酸与不同浓度的硫酸和醋酸所组成的新型芳烃氯甲基化催化剂体系。

Moreover, the increase of adsorption capacity of thiophene was much relative with the strength and density of Lewis acid.

噻吩吸附容量的提高与Ce-MCM-41的Lewis酸的酸强度及酸密度有直接关系。

The results show that the metal stannate combined with Mg2 can be used as a highly effective flame retardant for flexible PVC, and it can be seen that the Mg2 enhances the flame retardant properties of the samples through the endothermic dehydration, the stannate may act in both the condensed and vapor phases, but mainly in the condensed phase as a Lewis acid.

结果表明：锡酸盐和Mg2复合使用能明显提高对软PVC的阻燃效率，Mg2主要通过脱水吸热作用使材料的阻燃性能提高，而锡酸盐可分别在凝聚相和气和起作用，但主要为凝聚相Lewis酸催化机理。

In the second part, the first example of Lewis acid catalyzed 1, 3-cycloaddition between nitrones and alkylidene malonates was developed by using trisoxazoline 63 and Co〓.

催化剂的用量可降至1-2mol％。在论文的第二部分，我们首次研究了Lewis酸催化的硝酮与丙二酸酯类衍生物的1，3-偶极加成反应。

A three-dimensional large pore zeolite Hβ is used in the benzoylation of anisole instead of the classical Lewis acid catalysts to synthesize the important fine chemical intermediate 4-methoxybenzophenone.

采用高硅铝比、热稳定性好的三维大孔Hβ沸石替代传统Lewis酸催化剂催化苯甲醚的苯甲酰化反应，合成了重要精细化工中间体4-甲氧基二苯甲酮，收率可达92%。

The Lewis acid sites M〓 on the surface of catalysts can chemisorb continuously gaseous molecule oxygen and transform it into lattice oxygen of the catalysts.

在反应过程中，有表面羟基形成，羟基相互作用形成H〓O，催化剂表面Lewis酸位M〓吸附气相中分子氧，并将其转化为晶格氧，使催化剂表面复原。

Metoprolol was synthesized with isopropylamine and 4-(2-methoxyethyl)phenyl glycidyl by different Lewis acid.

Lewis酸催化对甲氧乙基苯基缩水甘油醚与异丙胺的反应得到美托洛尔，考察不同的催化剂、反应温度、反应时间对反应的影响。

Linear dimerization of isoprene to form myrcene ;2. Synthesis of Unsaturated Cyclothioethers byCycloaddition Reactions of Myrcene;3. The traditional synthesis is by the way of Diels-Alder reaction of myrcene with acrolein over Lewis acid catalysts in organic solvent.

二烷基咪唑或烷基吡啶卤化物与ZnCl2 构成一类新型的具有Lewis酸性的离子液体，以其为催化剂和反应介质，通过月桂烯与丙烯醛的Diels Alder反应高区域选择性地合成了对位柑菁醛。

Meanwhile other cata- lysts of the Lewis acid type, such as ferric chloride and stannic chloride, were also tried, but the results were not satisfactory.

其他的Lewis酸如氯化铁及氯化锡都经用作催化剂而进行试验；但未得满意的结果。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。