负载型纳米Ni催化剂用于对氯硝基苯选择加氢

以TiO2为载体,N iB为诱导剂,粉末化学镀法制备了负载型纳米N i催化剂.通过TEM、HRTEM、XRD和ICP技术对催化剂物性进行了表征.结果表明,碱性镀液可使载体表面均匀负载微晶结构纳米N i团簇,尺度为35nm左右.该负载型纳米N i在对氯硝基苯选择加氢反应中表现出很高催化加氢活性,并能有效抑制脱氯,达到了工业骨架镍水平.由酸性镀液得到的负载型非晶态纳米N i-P合金具有较弱的催化对氯硝基苯加氢活性.反应温度对反应时间和脱氯率有明显影响.     

无机锡催化δ-酮腈异构化成吡啶酮反应的研究

本文分别对三种无机锡(SnCl~2,SnO和SnO~2)催化δ-酮腈异构化成吡啶酮的条件进行了考察。实验结果表明:SnCl~2和SnO具有很高的催化活性。     

苯并咪唑衍生物的合成改进

利用空气作氧化剂, 无需任何催化剂, 以甲醇作溶剂, 芳香醛与邻苯二胺反应一步合成苯并咪唑衍生物, 产率均超过69%, 产物的结构通过元素分析、红外光谱和核磁共振氢谱确证, 该方法具有操作简单、反应条件温和、环境友好的优点.     

A Facile Synthesis of Ethyl 2,4-Dimethoxy-6-perfluoroalkyl-benzoates via Acyclic Precursors

Introduction Polysubstituted arenes are important intermediates in synthetic medicines and dyestuffs, and the fluorinated analogues are more attractive as a result of their lipo-philicity and the increment of activity.1,2 Therefore, to study the convenient and efficient synthesis of polysub-stituted arenes is valuable in organic synthetic method-ology. We have designed a simple synthesis of fluori-nated polysubstituted arenes through the intramolecular Wittig reaction of a new phosphorous ylid…     

低浓度乙醇催化燃烧研究进展

近年来随着环境污染和能源危机的全球化,乙醇作为洁净燃料或燃料添加剂越来越受到人们的关注.美国每年加入汽油的乙醇大约15亿加仑[1],乙醇的加入能够提高燃料的辛烷值并减少污染物的产生.乙醇价廉,运输方便,便于贮存并且可由生物法制得[2],与传统燃料相比降低了NOx和SOx等污染     

四种硝基苯的电化学行为及其反应活性的理论计算

在滴汞电极上研究了硝基苯、对硝基甲苯、间二硝基苯及2，4-二硝基氯苯的电化学行为，并用量子理论对四种硝基苯化合物的反应活性进行了预测，理论与试验结果基本一致，据此提出了预测分子的电化学活性的方法。     

Low Dimension Semiconducting Composite Nanomaterials

Recently, low dimension nanostructures have gained considerable attention due to their technological potential as unique types of nanoscale building blocks for future optoelectronic devices and systems. Semiconducting composite nanomaterials, which can combine the advantages of two or more components, have been the focus in the area of nanomaterials synthesis and device application.In this paper, we report our work on the preparation of composite nanomaterials based on CNTs.CNTs were coated by organic or inorganic species via novel and facile methods (Fig. 1 and Fig.2).These functional CNTs based composites show eminent prospects and opportunities for new applications in a wide variation of areas.     

Cleavage of the Fe-Fe Bond of(Me_2SiSiMe_2)[η~5-C_5H_4Fe(CO)_2]_2 with Na/Hg and Molecular Structure of the Ring-Opened Complex

The reaction of the title cyclic complex(1) with sodium amal-gam in THF resulted in the expected cleavage of the Fe--Febond to afford bis-sodium salt (Me_2SiSiMe_2) [η~5-C_5H_4Fe(CO)_2Na]_2 (4). The latter was not isolated and was used di-rectly to react with MeI, PhCH_2Cl, CH_3C(O)Cl, PhC(O)Cl,Cy_3SnCl (Cy=cyclohexyl) or Ph_3SnCl to afford correspondingring-opened derivatives (Me_2SiSiMe_2) [η~5-C_5H_4Fe(CO)_2R]_2[5, R=Me; 6, R=PhCH_2; 7, R=CH_3C(O); 8, R=PhC     

1‐Acetyl‐3′‐(4‐bromophenyl)‐3′‐chlorospiro[3H‐indole‐3,2′‐oxetan]‐2(1H)‐one

In the title compound, C₁₈H₁₃BrClNO₃, the heterocyclic ring of the indole is distorted from planarity towards an envelope conformation. The orientations of the indole, oxetane, chloro and bromo­phenyl substituents are conditioned by the sp³ states of the spiro‐junction and the Cl‐attached C atoms.     

Hydrothermal Synthesis and Crystal Structure of a Highly Reduced Mixed Molybdenum-vanadium Polyoxometalate with Phosphorus-centered [Ni(phen)3]2H2·[PmoⅤ4MoⅥ4VⅣ6M2M44]5-·4H2O(M=0.78MoⅤ+0.22VⅣ)

Polyoxometalates(POMs0) containing Keggin moieties exhibit a wide variety of compositions and have considerable structrral versatility as well as important magnetic, optical,and catalytic proper-ties[1-6].