查询词典 oxidant

The optimum reaction condition for preparation of CoPcY is as follows: a , using CoCl2 as the exchanged salt ; b , complexation temperature of 180 ; c . complexation catalyst of NH4C1 and A1C13 .2, The unsymmetrically substituted cobalt phthalocyanine complexes were synthesized by statistical condensation of phthalic anhydride and tetrabromophthalic anhydride, and further immobilized in MCM-41 molecular sieves by zeolite synthesis method, as well as characterized by XRD,FT-IR,DRS, 1HNMRetc. The catalytic property of CoPcBrx/MCM-41was tested by cyclohexane oxidation using H2O2 or t-BOOH as oxidant.

2采用本路线制备CoPcY的最佳条件为：a、采用氯化钴作为待交换的金属盐；b、络合温度以180℃为宜；c、起始反应物为苯酐、尿素、氯化铵、氯化铝、CoY时，制备出的CoPcY的催化性能最好； 2、首次采用苯酐和四溴苯酐均相浓缩统计合成法制得了不对称取代的金属钴酞菁络合物，并采用~1HNMR、FTIR、DRS等对其进行了结构表征；此外，采用沸石合成法将其固定于MCM-41中孔分子筛，并对其催化性能进行了考察。

A one-step method for the synthesis of aromatic indolizine derivatives byintramolecular 1,5-dipolar cyclization reaction of 2-(2-arylethenyl)pyridinium N-ylidesin the presence of an oxidant has been studied for the first time. In the presence ofelectron-deficient olefins, however, 2-(2-phenylethenyl)pyridinium N-ylides underwent1,3-dipolar cycloadditions and then aromatized in situ by TPCD to produce indolizinederivatives, indicating 1,3-dipolar cycloaddition proceed more readily than 1 ,5-dipolarcyclization in these conditions. Pyridinium disubstituted N-ylides, readily obtainedfrom corresponding pridinium and β-chlorovinyl ketone, underwent thermalintramolecular 1,5-dipolar cyclization to give indolizine derivatives easily.Indolizinecarbaldehyde derivatives were synthesized starting from 2-pyridinecarbaldehyde in four-steps involving 1,3-dipolar cycloaddition reaction.

本文首次研究了2-(2-芳基乙烯基)吡啶N-叶立德在氧化剂存在下的分子内1，5-偶极环化反应，采用一锅法合成了中氮茚衍生物；研究了这些N-叶立德的1，5-偶极环化和1，3-偶极环加成反应的选择性，发现当有缺电子烯烃存在时，优先进行1，3-偶极环加成反应，而不再发生分子内1，5-偶极环化反应；由β-氯乙烯酮方便地得到了烯丙基N-叶立德，他们在加热时进行分子内1，5-偶极环化反应而得到中氮茚衍生物；由2-吡啶甲醛为起始原料，通过1，3-偶极环加成反应等四步反应，得到了重要的中氮茚甲醛衍生物，这些反应都具有条件温和和操作简便的特点，是合成中氮茚衍生物的新方法。

This paper puts forward the Theory of Oxidant supplying Oxygen which better explains the leaching mechanism. This theory absorbs and denies the five theories brought up about gold leaching mechanism with cyanide, analyses and caculates from them odynamics and kinetics respectively. These give reliable theorial basis for further catching the mechanism and essence of cyaniding and non cyaniding ways.

论文对氰化浸金机理的五种理论进行了论证和分析，从热力学和动力学上分别进行了理论分析和计算，提出了比较合理的解释浸金机理的供氧体氧化剂理论，为深入理解氰化法和非氰化法提金的机理和本质，提供了理论基础。

O3/UV process is a kind of AOPs, which combined O3 with ultraviolet radiation, under the radiation of UV, O3 is accelerated its decompounding course remarkably, and generated the strong oxidant hydroxyl radicals in solution.

臭氧紫外光（O3/UV）法是将臭氧与紫外光辐射相结合的一种高级氧化技术。在紫外光的辐射下臭氧显著地加速了分解速率，在溶液中形成具有强氧化特性的羟基自由基。

All ofthese reactions were carried out under mild conditions and are new effective methodsfor the preparation of indolizine derivatives. The reaction of phthalazinium and quinoxalinium N-ylides with electron-deficientolefins in the presence of oxidants have also been studied, it has been found that activemanganese dioxide could behave as a dehydrogenating oxidant. Pyrrolo[2,1-a]phthalazines and pyrrolo[1,2-a]quinoxalines are obtained in this way.

本文还对六员二氮杂环化合物酞嗪和喹喔啉的N-叶立德在氧化剂存在下与缺电子烯烃的l，3-偶极环加成反应作了研究，发现活性二氧化锰也是一个优良的氧化剂，并分别合成得到了吡咯并[2，1-a]酞嗪和吡咯并[1，2-a]喹喔啉衍生物。

The desulfurizing absorption tail liquid treated by microbe is basic, and it can return directly to the desulfurizing absorption unit and be reused as a basic absorption liquid; the chemical oxidant is oxygenized by microbe to revive.

脱硫吸收尾液经微生物处理出水为碱性，可直接返回脱硫吸收单元作为碱性吸收液循环利用；化学氧化剂通过微生物氧化实现再生。

Psoralea crolyforlia sensitizes the skin to the tanning effect of sunlight, while Coconut oil works as a strong anti-oxidant and helps us to activate melanin pigment in the skin.

补骨脂在阳光照射下使皮肤更加敏感晒成褐色，而椰子油做为抗氧化物质来帮助我们激活皮肤上的黑色素

He effects of such factors as alkali agent, reductant, oxidant,temperature and time on the result of real silk fabric dyeing by sulphurs are discussed, with a comparison of sulphurs dyeing results between real silk and cotton fabricly.

探讨了真丝绸硫化染料染色中碱剂、还原剂、氧化剂、温度、时间等因素对染色结果的影响，比较了硫化染料在真丝绸及棉织物上的染色效果。

Vitamin E is an essential element for anti-oxidant which brightens and whitens skin color, provides you a lighting, smooth, brilliant skin. Its easy to you to have a beautiful face.

维他命E为重要的抗氧化剂，让肌肤呈现白皙透亮的肤色，使脸部肤质更具光滑，轻轻松松还你明亮光泽的肌肤。

The effect of reaction temperature, time, water volume, oxidant, acetic acid, ethanol, and sodium carbonate on the yield of reducing sugar were investigated.

在亚临界水的状态下对稻壳和麦麸进行水热糖化实验，考察了反应温度、反应时间、加入水的体积以及氧化剂、醋酸、乙醇、碳酸钠等对还原糖产率的影响。

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。