一种新呋喃酮香料的合成与表征

呋喃酮类香料在食品、烟草中应用很广。文章在无水无氧,二乙胺存在的条件下,萘化锂与丁酸作用,生成α－碳负离子丁酸锂,然后再与１,２－环氧丙烷作用,得到γ－羟基酸,经分子内脱水环化得呋喃酮,用ＩＲ、１３ＣＮＭＲ和ＧＣ／ＭＳ对其进行了研究,并对反应机理进行了讨论。     

光Fenton体系氧化降解水中孔雀石绿的研究

进行了光Fenton体系催化氧化降解染料孔雀石绿(MG)水溶液的研究,考察了光、pH值、Fe2+和H2O2投加量等因素以及阴离子的存在对MG降解率的影响。结果表明,室温（20 OC）下,pH=3.5±0.1、[Fe2+]0=0.25mmol/L、[H2O2]0=0.5mmol/L的条件下,经氙灯（λ > 290 nm）照射30 min后,MG水溶液（15 mg/L）的降解率达到95%以上。Cl-的存在对MG在光Fenton体系中的降解有阻碍作用,SO42-的存在对反应基本没影响,而NO3-促进了MG的氧化降解速率。     

Highly stable N-containing polymer-based Fe/Nx/C electrocatalyst for alkaline anion exchange membrane fuel cell applications

A cost-effective electrocatalyst with high activity and stability was developed. The Fe-Nx and pyridinic-N active sites were embedded in nitrogen-doped mesoporous carbon nanomaterial by carbonization at high temperature. The electrocatalyst exhibited excellent electrochemical performance for the oxygen reduction reaction, with high onset potential and half-wave potential values (E_onset = 1.10 ?V and E_1/2 ?= ?0.944 ?V) than 20 ?wt % Pt/C catalyst (1.04 and 0.910 ?V). The mass activity of the Schiff base network (SNW) based SNW-Fe/N/C@800° electrocatalyst (0.64 ?mA ?mg^?1 @ 1 ?V) reached about half of the commercial Pt/C electrocatalyst (1.35 ?mA ?mg^?1 @ 1 ?V). The electrocatalyst followed the 4-electron transfer mechanism due to very low hydrogen peroxide yield (H₂O₂ ?< ?1.5%) was obtained. In addition, this electrocatalyst with dual active sites showed high stability during cyclic voltammetry and chronoamperometry measurements. More importantly, the electrocatalyst also demonstrated the power density of 266 ?mW ?cm^?2 in the alkaline anions exchange membrane fuel cell (AEMFC) test, indicating its prospective application for fuel cells.     

5-(2-硫甲基-4-甲基)-嘧啶基-戊二炔-1-醇山梨酸酯的合成、表征及其环化

合成了5-(2-硫甲基-4-甲基)-嘧啶基-戊二炔-1-醇山梨酸酯,并用IR、UV-vis、1H、13C、DEPT、gCOSY、gHSQC和gHMBC等对产物进行了表征.此化合物具有两个共轭系统,在gHMBC中检测到了五阶和六阶碳氢相关信号.在光热条件下,此化合物发生分子内环加成形成苯环结构.     

关于汽车发动机代用燃料的应用分析

对生物能源液体燃料、气体燃料等汽车发动机代用燃料的物理化学性质、应用特性和环保特性进行了详细的讨论，对汽车代用燃料的可行性和必要性进行了分析，并对其应用前景进行了预测。     

取代苯乙胺的合成

采用2种方法合成一系列取代苯乙胺，对取代苯乙胺的合成方法和工艺做了初步研究，提高了收量，最高收率达77.00%；用分步还原法得到单甲氧基取代苯乙胺，其收率较Zn/Hg齐法略高，多甲氧基取代苯乙胺的收率与Zn/Hg齐法相似。     

关于常见阴离子未知液半微量定性分析的讨论

通过对常见阴离子未知混合液半微量定性分析的一些问题的讨论 ,对阴离子分析时的某些步骤提出一点改进性意见。     

不同价态含硫阴离子的毛细管电泳分析

对硫的不同价态阴离子 (S2 -,S2 O2 -3 ,SO2 -3 ,SO2 -4 )用毛细管电泳方法进行分离测定。采用铬酸钠和十四烷基三甲基溴化铵为背景电解质 ,2 5 4nm紫外间接检测。在选定条件下 ,重复进样 9次 ,各种阴离子迁移时间的相对标准偏差小于 0 .5 %,面积的相对标准偏差小于 5 %。     

Search for new antiphytovirucides

A convenient method to synthesize substituted 2-(2′-hydroxyphenyl) benzimidazoles is reported. Six title compounds have been synthesized by the reaction of salicylic acid and 4-substituted0-phenylenediamine in the presence pyridine-POCl₃. Three compounds were tested as plant virucide against tobacco mosaic virus and they exhibited some activities. Supported by the National Natural Science Foundation of China, and National Laboratory of Elemento Organic Chemistry of Naikai University Huang Xiaoling: born in 1938, Professer