环烯

MCM 22 had the lowest activity of 0 8% and ZSM 5 with 12 membered ring channels gave a ...

MCM 2 2分子筛的活性很低，其环己烯转化率只有 0 8%。

From the reaction mechanism, which involved formation of benzodiazepinium ethoxycarbonylmethylate, the reaction mechanism, which involved formation of benzodiazepinium ethoxycarbonyl- methylate followed by cycloaddition reaction, was tentatively proposed.

通过研究反应过程中分离出的副产物反丁烯酸二乙酯III和4，5-二氢吡唑-3，4，5-三羧酸乙酯IV，初步提出了反应经过乙氧羰基甲基化苯并二氮杂卓翁中间体V再发生环加成反应的机制。

The tetraoxazoline ligands only afforded the-configuration whether monometallic and/or bimetallic palladium complexes were formed upon the complexing process. Using the chelation-induced axially chiral palladium complex as a catalyst, excellent catalytic activities and enantioselectivities in the Wacker- type cyclization of allylphenols with up to 99% ee were gained.

当它与钯离子配位后只得到了轴构型为S的单金属或双金属配合物，并将该配体应用于钯催化的邻烯丙基苯酚的Wacker-type环化反应中，获得了很好催化活性和高达99% ee。

This paper mainly studies effect and influence factor that typical corrosive medium (muriatic acid, vitriol, nitric acid, sodium hydroxide, sodium chloride etc.), consistence and condition temperature acts on the material coated on castiron centrifugal interface (PFEP, PPS, CPE, remodeled epoxy). It is studied that powder electrostatic spray, suspend fluid spray, suspend fluid electrophoresis underside coat etc. technics influences on coat quality coated with above four anticorrosive material. The property analysis is done that above four anticorrosive material and three coat technics adapt to centrifugal pump frame and running dynamic condition. In addition, the effect is introduced that castiron centrifugal coated anticorrosive material is used in coal water with alum.

本文侧重研究了典型腐蚀工作介质盐酸、硫酸、硝酸、氢氧化钠碱、氯化钠盐等品种、浓度、环境温度，对铸铁离心泵过流面的聚全氟乙丙烯、改性聚苯硫醚、改性氯化聚醚、改性环氧四种防腐涂层材料的试验使用效果和影响因素分析；研究了四种涂层材料粉末静电喷涂、悬浮液喷涂、悬浮液电泳底涂等涂装方法工艺对涂层质量的影响；四种涂层材料和三种涂装方法对离心泵结构和运行动态环境的适应性分析；介绍了铸铁离心泵防腐涂层在煤矿矾水中的应用效果。

In this paper, we mainly studied the design of a new oscillating system and...

其中L为5，7，7，12，14，14—六甲基—1，4，8，11，—四氮环杂十四—4，11—二烯，并将此化学振荡应用于酪氨酸、色氨酸、半胱氨酸的测定，结果令人满意。

This paper reviewed the applications of strong organic base DBU in synthesis of phthalocyanine compounds.

文章介绍了有机碱1，8-二氮杂双环[5.4.0]十一-7-碳烯，作为一种有效的催化剂在酞菁类化合物的合成中的重要作用。

In the rearrangement reaction of α-pinene oxide, the rule of production distrubtion was related to the surface acid property of the catalysts.

在α-蒎烯环氧化物的重排反应中，产物分布规律与催化剂的表面酸性有很大关系。

By adding some co-catalyst and/or co-oxidant, we have improved the system\'s epoxidation ability. Forα-pinene, 81% GC yield were obtained in this system.

通过引入助催化剂和／或助氧化剂，使其系统对α—蒎烯的环氧化反应得到有效的改善，GC产率达到了81％。

The effects of the A-1 concentration, the sodium tungstate concentration, the molar ratio of H2O2 to pinene, and the reaction temperature are investigated.

考察了季铵盐(A-1)的浓度、钨酸钠浓度、H2O2与蒎烯的量比、反应温度对环氧化反应的影响。

In this paper, UV-vis spectrum, IR spectrum, viscosity measurement and ~1H NMR spectra of polymer were provided in order to show the characteristic of copolymer between pinene epoxides and maleic anhydride.

本文还使用紫外光谱、红外光谱、粘度测定、核磁共振等方法对共聚产物进行了分析，研究了环氧蒎烷与顺丁烯二酸酐共聚合产物的特性。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。