歧化松香胺Schiff碱-镍配合物的合成及催化枞酸氧化

歧化松香胺Schiff碱;镍配合物;枞酸;氧化     

Isoquinolinium bromochromate： An efficient and stable reagent for bromination of hydroxylated aromatic compounds and oxidation of alcohols

The new chromium(Ⅵ) oxidizing reagent isoquinolinium bromochromate(IQBC) was prepared and characterized.The IQBC has been found to be stable and an efficient solid reagent which can be easily prepared in good yield.It act as an efficient brominating reagent for hydroxylated aromatic compounds as well as good oxidizing reagent for the conversion of alcohols to carbonyl compounds in good to excellent yield.The synthesized isoquinolinium bromochromate is more ideal reagent,with number of specification inclu...     

3,4-双(3,′5′-二硝基苯-1′-基)氧化呋咱的合成

设计并合成了新化合物3,4-双（3′,5′-二硝基苯-1′-基）氧化呋咱（4）。以苯甲腈为起始原料,经加成、重氮化、分子间二聚得到3,4-二苯基氧化呋咱（3）,3经HNO3／H2SO。硝化合成了4,其结构经^1H NMR,IR和元素分析表征;初步考察了加成、重氮化、缩合环化、硝化等反应的主要影响因素,确定了适宜的反应条件。     

表面活性剂对3-甲基吡啶电氧化制取烟酸的影响

研究了在阳极液中加入不同类型和不同浓度表面活性剂对3-甲基吡啶电氧化的影响. 结果表明, 十六烷基三甲基溴化铵、脂肪醇聚氧乙烯醚硫酸钠、十二烷基苯磺酸钠、十二烷基二甲基甜菜碱和山梨醇酐单硬脂酸酯的胶团对3-甲基吡啶电氧化有明显的促进作用. 实验结果还表明, 在低浓度的硫酸为支持电解质阳极液中加入表面活性剂与不加表面活性剂相比, 3-甲基吡啶电氧化制取烟酸的选择性和电流效率明显提高.     

偶氮基杯芳烃化合物的合成及其偶氮-醌腙互变异构性质

通过芳胺的重氮化-偶合反应合成了8个偶氮基杯芳烃化合物, 其结构经IR, 1H NMR, ESI-MS和元素分析表征. 通过UV-Vis, 1H NMR和IR考察了溶液pH值对所合成化合物5,11,17,23-四[(2-苯并噻唑基)偶氮基]-25,26,27,28-四羟基杯芳烃(3)和5,17-二[(1-萘基)偶氮基]-25,26,27,28-四羟基杯芳烃(4)的偶氮-醌腙互变异构的影响. 结果表明, 随着溶液pH值增加, 醌腙体在偶氮-醌腙互变异构平衡中的比例增加, 当pH≥10时, 几乎全部转变为醌腙体. 特别当溶液pH=-1时, 化合物4可以形成一种大的共轭体系, 使其λmax由477 nm红移至545 nm.     

Synthesis and Crystal Structure of a Dialkyltin Benzamidoacetate Compound {[n-Bu2Sn（O2CCH2NHCOC6H5）]2O}2·C6H6

A dialkyltin benzamidoacetate compound {[n-Bu2Sn（O2CCH2NHCOC6H5）]2O}2· C6H6 has been synthesized by the reaction of dialkyltin oxide with benzamidoacetic acid in 1：1 molar ratio, and its structure was determined by X-ray single-crystal diffraction. The crystal belongs to orthorhombic, space group Pca21, with a = 1.9134（4）, b = 1.9605（4）, c = 2.0657（4） nm, Z = 4, V = 7.749（3） nm^3, Dc = 1.054 mg·m^-3,μ（MoKa） = 1.337 mm^-1, F（000） = 3576, the final R = 0.0405 and wR = 0.0860. According to the structural analysis, the tin atom adopts a distorted five-coordinate trigonal bipyramidal geometry, and the dimer structure is shaped by one planar four-membered Sn2O2 ring.     

酸量法及碘量法测定氧化葡聚糖的醛基

通过高碘酸钠氧化葡聚糖,制备不同氧化度的葡聚糖,采用酸量法和碘量法测定其醛基含量,但所得结果差异大.结合葡聚糖的氧化机理,以甘油的氧化反应结果作为对照,对借助化学滴定分析的酸量法和碘量法所得数据的差异性进行了分析.结果表明这种差异是由葡聚糖氧化存在的中间反应及其分支结构造成的,当高碘酸钠与葡聚糖的糖单元的物质的量比控制在2以内,操作简单的酸量法所得结果是可靠的.     

Catalytic Ignition of Light Hydrocarbons

Catalytic ignition refers to phenomenon where sufficient energy is released from a catalytic reaction to maintain further reaction without additional extemai heating. This phenomenon is important in the development of catalytic combustion and catalytic partial oxidation processes, both of which have received extensive attention in recent years. In addition, catalytic ignition studies provide experimental data which can be used to test theoretical hydrocarbon oxidation models. For these reasons, catalytic ignition has been frequently studied. This review summarizes the experimental methods used to study catalytic ignition of light hydrocarbons and describes the experimental and theoretical results obtained related to catalytic ignition. The role of catalyst metal, fuel and fuel concentration, and catalyst state in catalytic ignition are examined, and some conclusions are drawn on the mechanism of catalytic ignition.     

含氯离子电解液中二氧化钛纳米管的阳极氧化形成机理及应用

采用电化学阳极氧化的方法,以氯化铵(NH₄Cl)水溶液为电解液,在纯钛表面制备了二氧化钛(TiO₂)纳米管。考察了制备电压、氧化时间、Cl^-浓度和钛基体的退火处理对阳极氧化过程的影响规律,探讨了在含氯离子电解液中纳米管的形成机理,并基于上述含氯离子电解液中纳米管形成机制,通过两步阳极氧化法得到无支撑纳米管薄膜。     

VOCs催化燃烧Pd-Y/不锈钢丝网催化剂的性能

采用经阳极氧化工艺处理后的不锈钢丝网作为催化剂载体,制备了Pd-Y/不锈钢丝网催化剂。考察了该催化剂对典型的挥发性有机物(VOCs)(甲苯、丙酮和乙酸乙酯)的催化燃烧性能,并用SEM、TPR技术对催化剂的形貌和氧化膜的结构组成进行了表征。结果表明：采用阳极氧化技术在不锈钢表面形成致密的多孔氧化膜,有利于活性组分的负载及均匀分散,明显提高了催化剂的燃烧活性和稳定性,延长了催化剂的使用寿命。Pd-Y/不锈钢丝网催化剂上3种VOCs的完全氧化温度分别为220、280和320 ℃。控制甲苯进料浓度为4～6 g·m