等离子体反应合成全卤代

用聚四氟乙烯电弧蒸发和氯仿蒸气辉光放电方法合成了一系列全卤代芳香化合物,分离和表征了其中的全氟代芘(C₁₆F₁₀)和全氯代芘(C₁₆Cl₁₀),讨论了等离子体反应特征和产物形成机理。研究表明：等离子反应产物的形成不受起始物种、结构、形态和反应介质、放电方式的显着影响,而是形成了一系列结构相似的同系物.     

脉冲激光溅射合成全氯代多环芳烃

受Ｋｒａｔｓｃｈｅｒ等［１］电弧法合成Ｃ６０工作的启发,本课题组近年来以独创的液相电弧、微波放电等方法,合成了Ｃ５０及其多种全氯代碎片［２－５］．本文通过我们最近发展的脉冲激光溅射方法在四氯化碳的蒸汽中溅射石墨,得到丰富的克量级产物．这些产物经ＨＰＬＣ－ＵＶ－ＭＳ联用技术,表征为全氯代多环芳烃．其中部分物质含有五元环,可以看作是富勒烯形成过程中产生的全氯代碎片,该研究结果不仅有助于了解富勒烯的形成机理,而且展示了激光溅射合成法应用前景．１实验部分 实验在特制的反应装置上进行,所用的脉冲激光为Ｑ－…     

新型meso位芘取代氟硼二吡咯衍生物的合成及光敏活性

以1-芘甲醛为原料分别与2,4-二甲基吡咯和吡咯进行缩合反应,经由2,3-二氯-5,6-二氰对苯醌氧化脱氢、三氟化硼乙醚络合物配位后得到两种meso位芘取代的氟硼二吡咯（BODIPY）染料1和2。1和2经Vilsmeier-Haack反应引入醛基后分别与2,4-二甲基吡咯和吡咯反应得到四种meso位芘取代的BODIPY二聚体（1a, 1b,2a, 2b）;将染料1通过碘化反应生成单碘代产物1c和二碘代产物1d。经¹H NMR, ¹³C NMR和HR-MS（APCI）表征,以1,3-二苯基异苯并呋喃（DPBF）为单线态氧捕获剂测试了各衍生物的光敏氧化性能。结果表明：1a~1d的光敏氧化活性均高于母体1,碘代产物1c的光敏活性提升最大,对DPBF的光敏降解速率可达1的12.0倍,半数降解时间仅为29 s;2的光敏降解速率是1的4.9倍,光照72 s即可实现半数降解。      

CoTPP电化学催化原溴代环己烷的机理

以电化学循环伏安、现场ＥＳＲ电化学以及现场薄层电化学方法研究了电生Ｃｏ（Ｉ）ＴＰＰ与溴代五己烷的反机制。在ＤＭＦ中，Ｃｏ（Ⅱ）／Ｃｏ（Ⅰ）的氧化还原有明显的催化溴代环己烷还原的特片，反现场有自由基生成，反应产物之一是Ｃｏ－Ｃ键化合物，可以在１．３０Ｖ（ＳＣＥ）－电子还原，当存在ＣＨ２－ＣＨＣＮ时，。生成另一种Ｃｏ－Ｃ键化合物，该化合物在－１．１０Ｖ（ＳＣＥ）处一电子还原，证明溴代环己烷与Ｃｏ（Ｉ）     

He（2~3s）与CH_nCl_（4－n）（n＝1～4）在束－气条件下的传能解离激发反应

在束－气条件下，通过检测反应产物的化学发光光谱，研究了亚稳态Ｈｅ（２~３ｓ）原子与甲烷、氯代甲烷（ＣＨ_ｎＣｌ_（４－ｎ），ｎ＝１～３）反应中的解离激发动力学过程．观察到反应的主要激发态碎片ＣＨ（Ａ~２Δ）、ＣＨ（Ｂ~２Σ~（－））、ＣＨ（Ｃ~２Σ~＋）、Ｈ和ＣＣｌ（Ａ~２Δ），用参比反应测定了发光碎片的形成速率常数。对ＣＨ（Ａ，Ｂ）光谱的计算机模拟获得了ＣＨ（Ａ~２Δ，ｖ′＝０～２）和ＣＨ（Ｂ，ｖ′＝０）的振转分布。该反应的可资用能绝大部分转移成产物的平动能，且Ｈｅ（２~３ｓ）与甲烷及氯代甲烷反应形成ＣＨ（Ａ~２Δ，ｖ′＝０）的转动分布不同，前者为单Ｂｏｌｔｚｍａｎｎ分布，后者则在低转动能级上转动温度比高转动态低，近似可用双Ｂｏｌｔｚｍａｎｎ分布描述，对上述反应机理进行了讨论。     

芘荧光探针法研究C60-胶束水溶液体系的微环境性质

首次运用芘荧光探针法考察了Ｃ６０－胶束水溶液体系的微环境性质,发现Ｃ６０的介入可以改变非离子表面活性剂所形成胶束的结构而破坏胶束的有序情,从而使胶束的体积变大。Ｃ６０能显著猝灭芘单分子的荧光,而几乎不会破坏芘单体与其激基二聚体的平衡,表明Ｃ６０主要是同芘单分子之间发生ＣＴ作用。同时Ｃ６０对芘单分子荧光的猝灭在有机体系中主要呈现静态猝灭而在胶束体系中则主要呈现动态猝灭。     

金属卟啉催化条件下有机化合物与CO_2的电羧化反应（Ⅴ）──CoTPP和VB_（12）催化下卤代丁烷和CO_2的电羧化反应

研究了碘化四－（４－三甲胺基苯基）卟啉钴和ＶＢ_（１２）催化ＣＯ_２与卤代丁烷的电合成。该反应在－１．５Ｖ（ｖｓ．ＳＣＥ）即可发生，ＶＢ_（１２）催化产物为预期的戊酸丁酯，而ＣｏＴＰＰ催化产物为ＣＯ_２直接还原的草酸二丁酯，并未发现ＣＯ_２与卤代丁烷的反应产物。初步探讨了产生不同产物的原因．     

金属Ti原子与卤代甲烷的气相反应研究

利用带分子束装置的飞行时间质谱技术研究了激光溅射金属Ｔｉ原子与ＣＦ４、ＣＦ３Ｂｒ、ＣＦ３Ｃｌ、ＣＣｌ４的气相反应，激光电离飞行时间质谱检测结果表明，Ｔｉ原子与前３氟的卤代甲烷反应只生成ＴｉＦ，而与ＣＣｌ４反应时则生成了ＴｉＣｌ，可认为这类反应是通过电子转移机理进行的，Ｔｉ原子与三氟卤代甲烷反应时先形成「Ｔｉ＾＋…Ｆ＾－－ＣＦＸ」离子对中间体，然后生成产物ＴｉＦ。     

芘—苯甲醛COPNA树脂的合成及其磁性行为的研究

芘苯甲醛ＣＯＰＮＡ树脂的合成及其磁性行为的研究阮湘泉董奕郑嘉明郭崇涛（天津大学化学工程系，天津３０００７２）关键词三芳基甲烷，ＣＯＰＮＡ树脂，稳定自由基，铁磁性在有机磁体的研究中，Ｏｔａ等人曾研究了以次甲基交联的缩合多核芳香烃（ＣＯＰＮＡ）树脂经光...     

α-卤代腙与α-异氰酸酯反应合成4-腙基-2-异氰基丁酸酯类化合物

α-卤代腙与α-异氰酸酯在三乙胺作用下反应，生成4-腙基-2-异氰基丁酸酯类化合物。通过优化合成工艺，确定最佳反应条件为：α-卤代腙（1.0 eq.），α-异氰酸酯（1.2 eq.），三乙胺（1.2 eq.），二氯甲烷作溶剂，反应24 h。在此条件下进行了底物普适性研究，以高达79%的收率得到一系列具有潜在价值的4-腙基-2-异氰基丁酸酯类化合物，产物结构经¹H NMR，¹³C NMR和MS（ESI）确证。      

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.     

α-Amino acid derived enaminones and their application in the synthesis of N-protected methyl 5-substituted-4-hydroxypyrrole-3-carboxylates and other heterocycles

A new and simple synthesis of novel N-protected methyl 5-substituted-4-hydroxypyrrole-3-carboxylates, which exist in equilibrium with their 4-oxo tautomers, has been developed in two steps starting from N-protected α-amino acids. The key intermediates are enaminones, which can also be isolated, characterized, and used for the construction of other functionalized heterocycles, before they spontaneously decompose to pyrrole products. 4-Hydroxypyrroles are prone to partial aerial oxidation but can be efficiently alkylated or reduced to stable polysubstituted pyrrolidine derivatives.     

Specific intramolecular aromatic CH insertion of diazosulfonamides

The chemoselectivity in the intramolecular CH insertion of various diazosulfonamides has been experimentally studied. The results reveal that the aliphatic 1,4-, 1,5-, or 1,6-C(sp³)?H insertions of diazosulfonamides are not accessible, while the aromatic 1,5-C(sp²)?H insertion can be realized specifically by adjusting the diazo-adjacent group. In addition, the general chemoselectivities in the intramolecular CH insertions of diazosulfonyl compounds are summarized. Generally, diazosulfones undergo both aromatic 1,5-C(sp²)?H and aliphatic 1,5- and 1,6-C(sp³)?H insertions, while diazosulfonates undergo aliphatic 1,5- and 1,6-C(sp³)?H insertions. However, diazosulfonamides only undergo aromatic 1,5-C(sp²)?H insertion.     

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.     

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.     

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.     

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.     

N-Heterocyclic carbene-palladacyclic complexes: synthesis,characterization and their applications in the C-N coupling and α-arylation of ketones using aryl chlorides

N-Heterocyclic carbene-palladacyclic complexes 3 were successfully achieved in a one-pot procedure under mild conditions. The structure of 3a was unambiguously confirmed by X-ray single crystal diffraction and it was an active catalyst in the Buchwald-Hartwig amination and α-arylation of ketones even at very low catalyst loadings (0.01?mol%).     

Iodine-mediated oxidative Pictet-Spengler reaction using terminal alkyne as the 2-oxoaldehyde surrogate for the synthesis of 1-aroyl-β-carbolines and fused-nitrogen heterocycles

An efficient iodine-mediated oxidative Pictet-Spengler reaction in dimethyl sulphoxide (DMSO) using terminal alkynes as the 2-oxoaldehyde surrogate for the synthesis of aryl (9H-pyrido[3,4-b]indol-1-yl)methanones is described. The scope of the protocol includes the total synthesis of Fascaplysin, Eudistomins Y₁ and Y₂. The methodology is extended for preparing pyrrolo[1,2-a]-quinoxaline and indolo[1,5-a]quinoxaline derivatives. The utility of 1-aroyl-β-carbolines was demonstrated by performing palladium-catalyzed β-carboline directed ortho-C(sp2)-H functionalization of the phenyl ring with thiomethyl (SMe) group using DMSO as source and for accessing 4-aryl-canthin-6-ones.