2-取代吡啶半菁染料的无溶剂微波合成及光谱性质的理论研究

在微波促进无溶剂条件下, 由N-甲基-2-甲基吡啶碘盐与取代芳香醛在哌啶作用下合成了一系列2-取代的吡啶半菁染料, 产物结构由元素分析, ¹H NMR, MS, IR, UV得到确认. 该方法操作简便, 收率高. 在此基础上, 对N-甲 基-2-(p-N,N-二甲氨基-苯乙烯基)吡啶半菁染料的光谱性质进行了理论计算.     

含二茂铁和吡啶单元的手性席夫碱配体在钌催化的不对称氢转移反应中的应用

Chiral Schiff base complexes are very efficient for a wide range of reactions, including expoxidation[1], epoxide ring opening[2], Diels-Alder reaction[3], aldol reaction[4], etc. However, there are only few examples of P-N chelate Schiff bases being used as the chiral ligands in the asymmetric transfer hydrogenation of ketones. Recently, Gao et al[5] reported a series of P,N,N,P Schiff base ligands that have relatively low enantioselectivity in the asymmetric transfer hydrogenation of ketones.     

离子液体的酸性测定及其催化的异丁烷／丁烯烷基化反应

 初次采用吡啶红外光谱探针法测定了离子液体的酸性．该方法能鉴别离子液体的Br¨onsted／Lewis酸类型，并可以粗略指示离子液体的Lewis酸强度．将［bmim］Cl／AlCl3类离子液体用于催化异丁烷与丁烯的烷基化反应，考察了酸强度、反应温度、压力和时间对产物分布的影响，并在最优操作条件下与传统的H2SO4催化剂进行了比较．结果表明，离子液体对烷基化反应的催化活性和选择性与H2SO4可比，而且它更容易与产物分离，不经任何处理可循环利用10次．     

有机相中α-氰基-3-苯氧基苄醇乙酯的酶促醇解反应

研究了有机相中脂肪酶催化α-氰基-3-苯氧基苄醇乙酯的醇解化反应。制备α -氰基-3-苯氧基苄醇。考察了酶、溶剂、醇、醇用量、溶剂水含量以及底物浓度等 因素对反应的影响，结果表明Novozym435脂肪酶催化活性最高，经实验确定的最佳 条件为：脱水甲苯为溶剂，正辛醇为酰基受体，正辛醇、酯的摩尔比为1.5:1，酶 量为8 mg/mL时的最佳底物浓度为108.13 mmol/L，在上述条件下反应30 h酯的转化 率 > 96%。     

Novel Host Compounds, 1,1′-Binaphthyl-2,2′-Dihydroxy-5,5′- and 6,6′-Dicarboxylic Acid, which Trap Guest Molecules Tightly in their Inclusion Crystals

The host compounds 1,1’-binaphthyl-2,2′-dihydroxy-5,5′-dicarboxylic acid (1) and 1,1′-binaphthyl-2,2′-dihydroxy-6,6′-dicarboxylic acid (2) have been synthesized, and their inclusion properties have been studied. Inclusion complexes formed by 1 and 2 with volatile guests such as acetone and methanol release the guests only at much higher temperatures than their boiling points. The crystal structures of the inclusion complexes have been determined from single crystal X-ray diffraction data and show different host lattices.     

镓改性ZSM-5沸石中镓活性中心的形成与表征

采用脉冲微反体系研究了经不同程度还原和不同镓含量的GaZSM-5沸石的芳构化性能与吡啶吸附红外光谱特征谱带吸收度的关联，证实了1458 cm~(-1)吸收带的用于表征与Ga物种有关的活性中心，并研究了沸石的硅铝比对Ga中心形成和Ga的价态对芳构化性能的影响。结果表明，对Ga含量相同的样品来说，硅铝比愈低，起始Ga中心生成量愈多，高价态与低价态的Ga中心对丙烷芳构化反应都有促进作用。     

铑配合物催化甲醇羰基化反应的性能和机理

本文合成了２－丁酸甲酯吡啶与四羰基二氯二铑形成的螯合形配合物，并用Ｘ射线光电子能谱（ＸＰＳ），红外光谱（ＩＲ）及核磁共振（ＮＭＲ）研究确定了其配位结构特征，通过甲醇羰基化制备乙酸的反应揭示了其结构特征对催化剂活性及稳定性的影响，并提出了可能的反应机理。     

Synthesis of o-carborane-C-carboxylates of certain natural terpene alcohols, sterols, phenols, and camphar oxime

Previously unreported esters 1b–20b were synthesized from natural terpene alcohols, sterols, plant phenols, and camphar oxime (1a–20a) by reaction with o-carborane-C-carboxylic acid chloride. __________ Translated from Khimiya Prirodnykh Soedinenii, No. 5, pp. 434–436, September–October, 2006.     

Recovery of pyridine from aqueous solution by membrane pervaporation

Three different membranes, based on poly(dimethylsiloxane) (PDMS), cation-exchange material and poly(vinyl alcohol) (PVA) respectively, were tudied for the separation of pyridine-water mixtures by pervaporation. The PDMS membrane was preferentially permeable to pyridine and the other two were selective towards water. Three membranes showed different permeation performance, allowing the application of the technique to the separation of feeds of different composition. The temperature profile of the permeability suggests that it is possible to carry out the operation at an elevated temperature in order to achieve high productivity. A combination of the three types of membranes was designed for the production of anhydrous pyridine from dilute pyridine aqueous solution by pervaporation.