单核锌双卟啉配合物构象平衡的理论研究及光谱分析

合成了一系列以不同长度柔韧链相连的p/p型单核锌双卟啉配合物。选用Tripos力场,利用分子动力学模拟退火和分子力学构象搜索相结合的方法对该系列双卟啉进行了能量优化和构象分析。理论计算结果表明:该类双卟啉稳定存在的最低能量构象为叠合式,最高能量构象为伸展式,并存在一系列的中间能量构象;双卟啉分子内π-π作用和能量转移与双卟啉存在的两种主要构象密切相关;分析了分子内π-π作用的本质。运用不同光谱测试手段验证了理论计算结果: 利用可见和相应二阶导数吸收光谱研究了双卟啉主要存在的叠合式和伸展式构象,通过红外光谱观察了对双卟啉构象和卟啉环间π-π作用较为敏感的吸收谱带;利用荧光光谱计算了双卟啉的分子内能量转移效率。     

气相色谱中的超分子化学问题：Ⅰ.气相色谱与超分子化学的关系

超分子化学是有关超分子体系结构和功能的化学，超分子体系是由多个分子作用联系起来的实体，分子识别是形成超分本系的基本特征，本文从分子识别的角度，探讨了气相色谱学中超分子化学问题，并详细地评述了冠醚、液晶、环表固定液的分子识别机理的研究状况，最后，作者们大致展望了色谱研究超分子问题的前景，并且认为在多人工作基础上会产生一门新科学－超分子色谱学。     

分子调控的概念及其意义

在分子识别的基础之上提出了分子调控的新概念，指出分子调控是外界因素对分子某些性质的指令性干预，是超分子体系所持有的功能，通过这种调控作用，可以有意识、有目的地控制分子的行为，并列举若干实例加以说明。     

发光性受体的分子设计与分子识别

介绍了发光受体的几种典型分子识别模型。从分子识别与超分子化学的角度综述了它们在分子离子识别中的应用。对近几年发展较快的分子印迹技术及其应用进行了综述。引用文献71篇。     

分子识别在分析化学中的应用

本文概述了分子模板理论的产生和发展，总结了分子模板技术在分析化学领域中的应用和发展趋势，同时对分子印渍技术的理论进行概述，并指出分子印渍技术在分析化学领域中的应用和发展情况，阐述了分子模板和分子印渍技在分子识别分析方面的应用前景，其将为各种物质的超微量分析提供更加讯捷，准确，方便的分析方法。     

液晶态分子在分析化学中的应用进展

评述了液晶态分子在分析化学中的应用进展，包括其超分子的分子识别作用，液晶在色谱，光谱探针，核磁共振谱等分析化学领域中的应用。     

药物分子设计和核酸的分子识别分析

分子识别分析理论应用于药物分子设计是新药开发的要求，也是分析化学一个极具潜力的发展方向，分子识别分析不仅为药物分子设计提供了生物大分子的组成，结构基基本信息，还为了解药物分子与生物大分子相互作用位点及作用方式提供了模型，本文评述了与药物分子设计中有关的核酸物质的分子识别分析，它们是设计好的抗癌药物的基础。     

环糊精对手性药物伪麻黄碱分子识别的电喷雾飞行时间质谱研究

用电喷雾正交飞行时间质谱仪分别研究了以α－环糊精、β－环糊精和γ－环 糊精作为手性拆分剂对手性药物伪麻黄碱的分子识别效应，同时还分别研究了 Nozzle电的变化对α－环糊精和γ－环糊精的手性识别的影响。在质谱图中能明显 反映出三种手性拆分剂都具备很强的手性识别能力，随Nozzle电压的改变，三种手 性拆分剂双分别具有各自的手性识别特征。     

有机底物的分子识别

有机底物的分子识别陆国元（南京大学化学系２１００９３）分子识别在生物和生命活动中起中心作用。生物酶之所以高效专一催化生化反应，首先是由于酶对底物的精确的分子识别。８０年代中期以来，对中性有机分子，尤其是生物分子的人工分子识别研究日趋活跃，并已导致氨基...     

上海科学家研制出新型电化学生物传感器

不久前，上海科学家根据DNA可以灵敏识别特定分子的原理研制出新型电化学生物传感器，该传感器能灵敏检测出细胞中的能量分子三磷酸腺苷（ATP）的含量，将来可能用这种方法便捷地判断食品的新鲜程度。     

二氧化碳和丙烯直接合成甲基丙烯酸的NiPMo/TiO2催化剂的研究

用溶胶-凝胶法以磷钼酸(MPA)的镍盐溶液水解钛酸四丁酯制备了NiPMo/TiO2催化剂.使用ICP、 XRD、 TG-DTA、 IR、 TPD-MS和微反应技术研究了催化剂的化学组成、热稳定性、化学吸附性质和催化反应性能.杂多钼酸盐与TiO2通过O2-在TiO2表面发生了键合.在623 K下,杂多阴离子仍保持原有的Keggin结构.CO2在Lewis酸位Ni(Ⅱ)和Lewis碱位Ni-O-Mo的桥氧协同作用下生成CO2卧式吸附态Ni(Ⅱ)←O-(CO)←(O--Ni).丙烯有多种吸附态在催化剂上吸附.在563 K、 1 MPa和空速1500 h-1的反应条件下,丙烯的摩尔转化率为3.2%,产物MAA选择性为95%.     

Toward new camptothecins. Part 6: Synthesis of crucial ketones and their use in Friedländer reaction

In the context of the preparation of camptothecin and luotonin A analogs, the synthesis of some key keto-precursors and their use in Friedländer condensation are described. This paper also focuses on the stability of these keto intermediates and emphasizes the major differences between indolizinones and pyrroloquinazolinones series. Noteworthy is also the report of some original structures isolated as by-products of some experiments.     

CoFe2O4自形成磁性液体场致结构化对磁化的影响

The Langevin paramagnetic theory can’t describe the relation between magnetization of ferrofluids and applied magnetic field. The structuralization of ferrofluids, which is considered the main influence factor of the magnetization, is regarded. The part of magnetization works is deposited when the structure is forming. This action influences the magnetization of ferrofluids directly or indirectly. On the base of the “compressing” model, the Langevin function that usually describes the magnetization of ferrofluid is modified, and a well-fitted curve is obtained. An equation of the relation between the equivalent volume fraction after being “compressed” and the intensity of magnetic field is discovered, which approximately describes the process of magnetization. The relation between the approximate initial susceptibility and the volume fraction can be obtained from modified formula.     

Highly regioselective Buchwald–Hartwig amination at C-2 of 2,4-dichloropyridine enabling a novel approach to 2,4-bisanilinopyridine (BAPyd) libraries

The highly regioselective Buchwald–Hartwig amination at C-2 of the cheap and readily accessible reagent, 2,4-dichloropyridine with a range of anilines and heterocyclic amines is described. This new methodology is robust and provides a facile access to 4-chloro-N-phenylpyridin-2-amines on 0.25 mol scale. These intermediates undergo a further Buchwald–Hartwig amination at higher temperature to enable rapid exploration of the chemical space at C-4 and to provide a library of 2,4-bisaminopyridines.     

KMnO4-mediated oxidative CN bond cleavage of tertiary amines: Synthesis of amides and sulfonamides

KMnO₄-mediated oxidative CN bond cleavage of tertiary amines producing secondary amine was introduced, which was trapped by electrophiles (acyl chloride and sulfonyl chloride) to form amides and sulfonamides. The reaction could take place at mild condition, tolerating a wide range of function groups and affording products in moderate to excellent yields.     

Chemistry of heterocyclic compounds at the A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences, over 50 years (Review)

The review contains a concise historical account and information on the most significant researches undertaken by the staff at the A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences on the Chemistry of Heterocyclic Compounds. Dedicated to Academician of the Russian Academy of Sciences B. A. Trofimov on his 70th jubilee. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1443–1502, October, 2008.     

Sulfur-directed metal-free and regiospecific methyl C(sp3)–H imidation of thioanisoles

Regiospecific and direct imidation of the methyl C(sp³)–H bond of thioanisoles is realized under mild and metal-free conditions with N-fluorobis(benzenesulfonyl)imide as an oxidant and nitrogen source. Proposed mechanism suggests that thionium ion intermediates and a Pummerer-type reaction are involved. The imidation has advantages such as high step-economy, excellent functionality tolerance, and regiospecificity, giving structurally diverse imidation products.     

Selective syntheses of 2H-1,3-oxazines and 1H-pyrrol-3(2H)-ones via temperature-dependent Rh(II)-carbenoid-mediated 2H-azirine-ring expansion

The Rh(II)-catalyzed reaction of 2-carbonyl-substituted 2H-azirines with ethyl 2-cyano-2-diazoacetate or 2-diazo-3,3,3-trifluoropropionate provides an easy access to 2H-1,3-oxazines and 1H-pyrrol-3(2H)-ones. These compounds can be selectively prepared from the same starting material using temperature as the only varied parameter. The 2-azabuta-1,3-diene intermediate, a common precursor for both heterocyclic products, isomerizes into 2H-1,3-oxazine under kinetic control, while 1H-pyrrol-3(2H)-one is the sole product of the reaction at elevated temperatures. According to DFT-calculations a one-atom oxazine ring contraction involving ring-opening to a 2-azabuta-1,3-diene intermediate, followed by a 1,5- and 1,2-prototropic shift leads to the consecutive formation of imidoylketene and azomethine ylide, which then further undergo cyclization to the pyrrole derivative.     

Copper catalyzed/mediated synthetic methodology for ebselen and related isoselenazolones

Scope of the copper catalyzed/mediated selenium-nitrogen coupling reaction has been studied for the synthesis of isoselenazolones. It is noticed that the 2-chloro, 2-bromo-, and 2-iodo-aryl amides substrates can be exploited in the selenium-nitrogen coupling reaction by employing 25-100 mol % of CuI/1,10-phenanthroline (L) and potassium carbonate as a base in DMF. Furthermore, electron rich 2-chloro-arylamides also underwent selenium-nitrogen coupling reaction to give biologically important selenium-nitrogen heterocycles. Also, copper-catalyzed selenium-nitrogen coupling reaction has been meticulously applied for the synthesis of diaryl diselenides having methoxy, amine, and amide functionality from respective aryl iodides in the presence of stoichiometric amount of succinimide as an external Se-N coupling partner.