水中α,β-不饱和酮与3-甲基-1-苯基-2-吡唑啉-5-酮的加成反应

在水溶剂中有三乙基苄基氯化铵（TEBA）存在下，α,β-不饱和酮与3-甲基- 1-苯基-2-吡唑啉-5-酮发生迈克尔加成反应，以良好的产率生成相应的1,3-二芳基 -3-（3'-甲基-1'-苯基-5'-羟基-2'-吡唑啉-4'-基）-1-丙酮。     

1,4—二氢吡啶及其衍生物电化学反应机理的研究

研究了１１种１，４－二氢吡啶及其衍生物在乙腈溶剂中和铂盘电极上的电化学行为。实验结果表明：１，４－二氢吡啶及其衍生物在铂盘电极上的反应是受扩散和化学反应速率控制的两电子不可逆氧化过程，经连续两步失电子脱氢后形成相应的吡啶。用紫外吸收光谱电化学方法观测了电化学氧化过程。并与化学氧化产物的紫外光谱作了比较，证明１，４－二氢吡啶的电化学氧化产物与化学氧化产物一致。因此，电化学氧化是一种不需加化学试剂可使     

Determination of trace amounts of cobalt using 1-(5-bromo-2-pyridylazo)-2-naphthol-6-sulfonic acid-Cu(II)-Co(II) competitive replacement complexation

The chromophore 1-(5-bromo-2-pyridylazo)-2-naphthol-6-sulfonic acid (BPANS) has been used to sensitively complex Cu(II) and Co(II) in aqueous solution at pH 9.43. The spectral correction technique was applied to characterize the complexes, and results showed that both Cu(BPANS)2 and Co(BPANS)2 were formed. Trace Co2+ replaced the Cu(II) in the Cu-BPANS complex, so the competitive replacement complexation (CRC) was used to improve the analytical selectivity. A novel light-absorption ratio variation approach (LARVA) was described as one of the most sensitive methods. The combination of CRC and LARVA was applied to the quantitative detection of Co(II) at the ng/mL level. The limit of detection was only 2.0 ng/mL Co, and the analysis of water samples demonstrated satisfactory results.     

2,4,6-三甲基氧苯乙酮苯腙的成环反应

为了研究吲哚衍生物的生理活性与结构之间的关系, 我们采用 Fischer反应取代苯乙酮的苯腙与多聚磷酸(PPA)一起加热, 合成了一系列2-芳基吲哚。我们发现: 当取代苯乙酮分子中的芳基分别为2,3,4-三甲氧基苯基, 3,4,5-三甲氧基苯基或4,6-二甲基-2-甲氧基苯基时, 可以顺利地得到相应的2-芳基吲哚, 当芳基为2,4,6-三-甲氧基苯基时, 主要产物为4,6-二甲氧基-3-甲基-1-苯基吲唑。本文讨论了反应机理。     

配合物Ni(C14H10N2O3)(C5H5N)的合成和晶体结构

A novel nickel(Ⅱ) complex with 2,4-dihydroxybenzalidene benzoylhydrazone and pyridine ligands, Ni(C₁₄H₁₀N₂O₃)(C₅H₅N), has been synthesized and characterized by elemental analysis and IR. The crystal structure of the title complex has been determined by single crystal X-ray diffraction techniques. The crystal belongs to orthorhombic, space group Pbca. The cell parameters are: a=1.580 20(19) nm, b=1.362 18(16) nm, c=1.616 50(19) nm, and V=3.479 5(7) nm³, Z=8, D_c=1.497 Mg·m^-3, μ(MoKα)=1.139 mm^-1, F(000)=1 616, R=0.032 9 and wR=0.077 0 for 2 772 observed reflections (I>2σ(I)) out of 3810 unique ones. The nickel(Ⅱ) ion lies in a distorted square-planar environment composed of two oxygen atoms, one nitrogen atom of tridentate acyhydrazone schiff base ligand and one nitrogen atom of the pyridine ligand. The analysis of the crystal structure indicates that the complex has a one-dimensional chain structure, which is formed by intermolecular hydrogen bonds. CCDC: 244668.     

三元混合配合物Cu(C10H8N2O3)·(C5H5N)·(H2O)的合成和晶体结构

The novel copper(Ⅱ) complex with 2-oxo-propionic acid benzoyl hydrazone and pyridine ligands, Cu(C₁₀H₈N₂O₃)·(C₅H₅N)·(H₂O) (C₁₀H₈N₂O₃^2- is the dinegative ion of 2-oxo-propionicacid benzoyl hydrazone), has been synthesized and characterized by elemental analysis and IR. The crystal structure of the title complex was determined by single crystal X-ray diffraction technique. Complex crystallized in the triclinic space group P1 with a = 0.729 08(10) nm, b= 1.020 01(14) nm, c= 1.126 28(15) nm, α = 71.644(2) °, β = 80.437(2) °, γ = 89.160(2)°, V= 0.78328(18) nm³, Z= 2, D_c= 1.547 Mg·m^-3, μ(MoKα) = 1.417 mm^-1, F(000) = 374. The final R₁ = 0.030 6, wR₂= 0.084 2 for 2 992 observed reflections [I≥2σ(I)] out of 3357 unique reflections. In this complex, copper(Ⅱ) ion is square-pyramidally coordinated by two oxygen atoms and one nitrogen atom of tridentate C₁₀H₈N₂O₃^2- ligand, one nitrogen atom of the pyridine ligand, and one oxygen atom of water molecule with the oxygen atom of water molecule locating at the apical position. The analysis of the crystal structure indicates that the complex has a one-dimensional chain structure, which is formed by intermolecular hydrogen bonds. CCDC: 222656.     

手性胺诱导的甲基多巴不对称合成

左旋甲基多巴是一种高血压病治疗药物,对中等程度的原发性和肾性高血压病人有良好疗效。前已报道在相转移催化下,利■1(3,4一亚甲二氧基苯基)2一丙酮与氛仿、氨反应,合成a一甲基多巴,经拆分后得到左     

双金属配合物重铬酸四吡啶合镍(Ⅱ)[Py4Ni(HCrO4)2,TPND]:合成、晶体结构和氧化性质研究

本文合成了双金属配合物重铬酸四吡啶合镍(Ⅱ)[Py₄Ni(HCrO₄)₂,TPND],晶体结构解析表明,TPND是一个以Ni(Ⅱ)为中心的正八面体配合物,而每两个分子之间由两个Cr-O-Cr桥相连接。并对TPND的氧化性质进行了研究,发现其具有很高的脱氢活性,对芳香酮腙的脱氢氧化产率较高(81%～91%)。     

2-(对羟基苯氧基)乙基取代的Cyclen的合成和结构研究

在酸性条件下(pH＝2～3), 1,4,7,10-四氮杂环十二烷(Cyclen)和氯甲酸苄酯反应, 得到高选择性1,7-二保护Cyclen衍生物1,7-二(苄氧基羰基)-1,4,7,10-四氮杂环十二烷(4), 然后在二异丙基乙胺作用下和化合物1-苄氧基-4-(2-溴乙氧基)苯(2)一锅法有效合成了中间体1,7-二(2-对苄氧基苯氧基)乙基-4,10-二(苄氧基羰基)-1,4,7,10-四氮杂环十二烷(5)和4-(2-对苄氧基苯氧基)乙基-1,7-二(苄氧基羰基)-1,4,7,10-四氮杂环十二烷(6), 在乙醇溶液中经Pd/C催化氢解得到两种新型的用取代苯酚基修饰的Cyclen衍生物1,7-二(2-对羟基苯氧基)乙基-1,4,7,10-四氮杂环十二烷(7)和1-(2-对羟基苯氧基)乙基-1,4,7,10-四氮杂环十二烷(8), 其结构经¹H NMR, IR和MS确证. 用单晶X射线衍射法测定了化合物7的晶体结构, 晶体属单斜晶系, C2/c空间群, 晶胞参数a＝2.4145(6) nm, b＝1.6012(4) nm, c＝1.6632(4) nm, α＝γ＝90°, β＝120.360(3)°, V＝5.5486(6) nm³, Z＝8, D_c＝1.146 g/cm³, F(000)＝2056, μ＝0.082 mm^－1, R＝0.0853, wR＝0.2331 [I＞2σ(I)].