Chemistry - A European Journal

Cover image for Chemistry - A European Journal

November 22, 2010

Volume 16, Issue 44

Pages 13001–13283

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Concept
    7. Communications
    8. Retraction
    9. Communications
    10. Full Papers
    11. Preview
    1. Cover Picture: Organic Light-Emitting Diodes from Symmetrical and Unsymmetrical π-Extended Tetraoxa[8]circulenes (Chem. Eur. J. 44/2010) (page 13001)

      Dr. Christian B. Nielsen, Theis Brock-Nannestad, Dr. Theis K. Reenberg, Dr. Peter Hammershøj, Dr. Jørn. B. Christensen, Dr. Jan W. Stouwdam and Dr. Michael Pittelkow

      Version of Record online: 15 NOV 2010 | DOI: 10.1002/chem.201090217

      Thumbnail image of graphical abstract

      π-Extended tetraoxa[8]circulenes are formed in an acid-mediated condensation of 2,3-bisundecyl-1,4-benzoquinone with 1,4-naphthoquinone. The synthesis, characterization and incorporation of this series of alkane-soluble π-extended tetraoxa[8]circulenes in organic light-emitting diodes is described in the Communication by Pittelkow et al. on page 13030 ff. The tetraoxa[8]circulenes, depicted on the cover and overlooked by the Danish children's cartoon celebrity “Cirkeline”, exhibit beautiful green–blue to blue fluorescence depending on the substitution pattern.

  2. Inside Cover

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Concept
    7. Communications
    8. Retraction
    9. Communications
    10. Full Papers
    11. Preview
    1. Inside Cover: Porous Lithium Imidazolate Frameworks Constructed with Charge-Complementary Ligands (Chem. Eur. J. 44/2010) (page 13002)

      Dr. Shou-Tian Zheng, Yufei Li, Tao Wu, Ruben A. Nieto, Prof. Dr. Pingyun Feng and Prof. Dr. Xianhui Bu

      Version of Record online: 15 NOV 2010 | DOI: 10.1002/chem.201090218

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      The excessive negative charge that would accompany lithium zeolitic imidazolate frameworks (Li-ZIFs) is avoided by the introduction of auxiliary neutral ligands, which makes it possible to mimic silicate-like tetrahedral three- or two-dimensional metal–organic frameworks using the lightest metallic element. For more details, see the Communication by X. Bu, P. Feng et al. reported on page 13035 ff.

  3. Graphical Abstract

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Concept
    7. Communications
    8. Retraction
    9. Communications
    10. Full Papers
    11. Preview
  4. News

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Concept
    7. Communications
    8. Retraction
    9. Communications
    10. Full Papers
    11. Preview
  5. Concept

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Concept
    7. Communications
    8. Retraction
    9. Communications
    10. Full Papers
    11. Preview
    1. Natural Products

      Weapons in Disguise—Activating Mechanisms and Protecting Group Chemistry in Nature (pages 13020–13029)

      Jason C. Kwan and Prof. Dr. Hendrik Luesch

      Version of Record online: 7 OCT 2010 | DOI: 10.1002/chem.201001562

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      Natural prodrugs: Bioactive natural products (see figure) often work through novel and sometimes surprising mechanisms of action and, therefore, they serve as inspiration to synthetic and medicinal chemists, in terms of both structure and mechanism.

  6. Communications

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Concept
    7. Communications
    8. Retraction
    9. Communications
    10. Full Papers
    11. Preview
    1. Blue OLEDs

      Organic Light-Emitting Diodes from Symmetrical and Unsymmetrical π-Extended Tetraoxa[8]circulenes (pages 13030–13034)

      Dr. Christian B. Nielsen, Theis Brock-Nannestad, Dr. Theis K. Reenberg, Dr. Peter Hammershøj, Dr. Jørn. B. Christensen, Dr. Jan W. Stouwdam and Dr. Michael Pittelkow

      Version of Record online: 22 OCT 2010 | DOI: 10.1002/chem.201002261

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      Acid-mediated condensation of a 2,3-dialkyl-1,4-benzoquinone with 1,4-naphthoquinone produces a series of alkane-soluble π-extended tetraoxa[8]circulenes; these structures (shown here) were successfully incorporated in organic light-emitting diodes.

    2. Metal–Organic Frameworks

      Porous Lithium Imidazolate Frameworks Constructed with Charge-Complementary Ligands (pages 13035–13040)

      Dr. Shou-Tian Zheng, Yufei Li, Tao Wu, Ruben A. Nieto, Prof. Dr. Pingyun Feng and Prof. Dr. Xianhui Bu

      Version of Record online: 28 OCT 2010 | DOI: 10.1002/chem.201002316

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      Lightest tetrahedral node: While silica-type tetrahedral frameworks can be readily emulated with divalent metal compounds (e.g., zinc imidazolate frameworks), it is more difficult with Li+. Here, a new series of Li-based zeolitic imidazolate frameworks (Li-ZIFS) has been synthesized by using a strategy based on charge-complementary ligands designed to prevent excessively negative charge surrounding Li sites. Among them, some exhibit a high CO2 adsorption capacity (e.g., 49 cm3 g−1 at 273 K and 1 atm).

    3. Main Group Chemistry

      A Novel Soluble InI Precursor for Pn Ligand Coordination Chemistry (pages 13041–13045)

      Stefan Welsch, Michael Bodensteiner, Dr. Michal Dušek, Dr. Marek Sierka and Prof. Dr. Manfred Scheer

      Version of Record online: 13 OCT 2010 | DOI: 10.1002/chem.201002484

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      A new soluble In+ source containing the very weakly coordinating anion [Al{OC(CF3)3}4] was developed. In reaction with a P2 ligand complex an unprecedented tetracationic aggregate is formed featuring a short In⋅⋅⋅In distance (see picture). Polymeric strands arising from a reaction with a cyclo-P3 ligand complex exhibit a novel coordination mode for P3 units.

  7. Retraction

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Concept
    7. Communications
    8. Retraction
    9. Communications
    10. Full Papers
    11. Preview
    1. You have free access to this content
      Retracted: Enantioselective Radical Addition to Ketimines: A Synthetic Route Towards α,α-Disubstituted α-Amino Acids (pages 13046–13048)

      Sang Yoon Kim, Sung Jun Kim and Prof. Dr. Doo Ok Jang

      Version of Record online: 11 OCT 2010 | DOI: 10.1002/chem.201002071

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      A radical attack: In the presence of a protonated cinchonine derivative, radical addition reactions proceeded efficiently, providing a general approach to the synthesis of a diverse range of enantioenriched α,α-disubstituted α-amino acids.

  8. Communications

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Concept
    7. Communications
    8. Retraction
    9. Communications
    10. Full Papers
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    1. Metal–Organic Frameworks

      Synthesis and Enhanced H2 Adsorption Properties of a Mesoporous Nanocrystal of MOF-5: Controlling Nano-/Mesostructures of MOFs To Improve Their H2 Heat of Adsorption (pages 13049–13052)

      Dr. Zhifeng Xin, Prof. Junfeng Bai, Prof. Yi Pan and Prof. Michael J. Zaworotko

      Version of Record online: 13 OCT 2010 | DOI: 10.1002/chem.201001700

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      Controlled improvement: For the first time, a novel mesoporous cube of MOF-5 (MNMOF-5) was prepared for which it was shown that controlling the nano-/mesostructures can improve the H2 adsorption properties and facilitate the future applications of MOFs.

    2. Host–Guest Chemistry

      Versatile Anion–π Interactions between Halides and a Conformationally Rigid Bis(tetraoxacalix[2]arene[2]triazine) Cage and Their Directing Effect on Molecular Assembly (pages 13053–13057)

      Dr. De-Xian Wang, Qi-Qiang Wang, Dr. Yuchun Han, Prof. Dr. Yilin Wang, Prof. Zhi-Tang Huang and Prof. Dr. Mei-Xiang Wang

      Version of Record online: 22 OCT 2010 | DOI: 10.1002/chem.201002307

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      Interactive halides: Bis(tetraoxacalix[2]arene[2]triazine), a conformationally rigid cage molecule of three V-shaped electron-deficient clefts, forms 1:1 complexes with fluoride (361 M−1), chloride (146 M−1) and bromide (95 M−1) in acetonitrile. Different anion–π interactions along with multiple hydrogen bonding, halogen bonding and lone-pair-electrons–π interactions directed the formation of different molecular assemblies (an example is shown here).

    3. Natural Product Synthesis

      Enantioselective Synthesis of the Lomaiviticin Aglycon Full Carbon Skeleton Reveals Remarkable Remote Substituent Effects during the Dimerization Event (pages 13058–13062)

      Hong Geun Lee, Jae Young Ahn, Amy S. Lee and Prof. Matthew D. Shair

      Version of Record online: 26 OCT 2010 | DOI: 10.1002/chem.201002157

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      A full carbon skeleton of the natural product lomaiviticin has been synthesized. The approach features anionic annulation reactions to deliver A and B rings of the natural product, and stereoselective oxidative enolate coupling to form the central C2[BOND]C2′ σ bond. In the course of the investigation, a remarkable substituent effect at C11 position was observed.

    4. Homogeneous Catalysis

      C-2 Arylation of Piperidines through Directed Transition-Metal-Catalyzed sp3 C[BOND]H Activation (pages 13063–13067)

      Dr. Hana Prokopcová, Dr. Sheba D. Bergman, Dr. Karel Aelvoet, Veerle Smout, Prof. Dr. Wouter Herrebout, Prof. Dr. Benjamin Van der Veken, Dr. Lieven Meerpoel and Prof. Dr. Bert U. W. Maes

      Version of Record online: 27 OCT 2010 | DOI: 10.1002/chem.201001887

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      All you need is an open vial! The direct α arylation of cyclic alkylamines (see scheme) requires an open vial, as the hydrogen atom involved in the C(sp3)[BOND]H-activation process is ultimately released as hydrogen gas. Reports on the formation of hydrogen gas in direct transition-metal-catalyzed functionalizations are still rare. Open-vial reactions proved crucial to this direct arylation procedure as, upon sealing, catalyst deactivation occurs.

    5. Asymmetric Synthesis

      Enantioselective Synthesis of Coumarins Catalyzed by a Bifunctional Amine–Thiourea Catalyst (pages 13068–13071)

      Dr. Yaojun Gao, Qiao Ren, Lei Wang and Prof. Dr. Jian Wang

      Version of Record online: 28 OCT 2010 | DOI: 10.1002/chem.201002202

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      Efficient excess: An efficient and facile enantioselective Michael addition reaction through hydrogen-bonding catalysis for the synthesis of coumarin complexes has been developed (see scheme). A simple bifunctional amine–thiourea small molecule has been discovered to catalyze this process with high yields and high to excellent enantiomeric excesses.

    6. Ferromagnetism

      Surface Passivation-Induced Strong Ferromagnetism of Zinc Oxide Nanowires (pages 13072–13076)

      Dr. Shu-Ping Huang, Dr. Hu Xu, Prof. Igor Bello and Prof. Rui-Qin Zhang

      Version of Record online: 13 OCT 2010 | DOI: 10.1002/chem.201001167

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      Partial surface passivation of surface zinc bonds is an alternative approach to conventional volume doping to induce ferromagnetism in ZnO nanowires. Nanowires with partial F passivation exhibit half-metallic ground-state properties. The ferromagnetic stability is improved when the dimensionality of ZnO decreases from two (surfaces) to one (nanowires). The surface passivation approach may be applicable to modulating the magnetic properties of general nanomaterials.

    7. Coordination Chemistry

      Metal-Dependent Coordination Modes Displayed by Macrocyclic Polycarbene Ligands (pages 13077–13081)

      Dr. Christian Radloff, Dr. Han-Yuan Gong, Dipl.-Chem. Christian Schulte to Brinke, Tania Pape, Vincent M. Lynch, Prof. Dr. Jonathan L. Sessler and Prof. Dr. F. Ekkehardt Hahn

      Version of Record online: 19 OCT 2010 | DOI: 10.1002/chem.201002276

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      Carbene–metal molecular box: Two imidazolium macrocycles, H2-1(X)2 and H4-2(PF6)4, act as precursors for the formation of poly(NHC) ligands. The carbene ligands display metal-dependent conformations in forming organometallic complexes. In particular, they are capable of stabilizing boxlike structures such as syn-[Ag2(1)2]2+ and [Ag4(2)2]4+ when exposed to linearly coordinated silver cations. In contrast, a monomeric species featuring a C-Pd-C angle of about 90° is formed between 1 and PdII.

  9. Full Papers

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Concept
    7. Communications
    8. Retraction
    9. Communications
    10. Full Papers
    11. Preview
    1. Anion Recognition

      Rotaxanes Capable of Recognising Chloride in Aqueous Media (pages 13082–13094)

      Laura M. Hancock, Lydia C. Gilday, Dr. Sílvia Carvalho, Dr. Paulo J. Costa, Prof. Vítor Félix, Christopher J. Serpell, Dr. Nathan L. Kilah and Prof. Paul D. Beer

      Version of Record online: 28 OCT 2010 | DOI: 10.1002/chem.201002076

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      Chloride wins: A new, versatile chloride-anion-templating synthetic pathway is exploited in the preparation of a series of eight new [2]rotaxane host molecules (see image), including the first sulfonamide interlocked system. 1H NMR spectroscopic titration investigations demonstrate the rotaxanes' capability to recognise chloride anions in competitive aqueous solvent media, including a dicationic rotaxane that binds chloride in 35 % water.

    2. Palladium

      Imidazoliophosphines are True N-Heterocyclic Carbene (NHC)–Phosphenium Adducts (pages 13095–13108)

      Ibrahim Abdellah, Dr. Christine Lepetit, Dr. Yves Canac, Carine Duhayon and Prof. Remi Chauvin

      Version of Record online: 24 SEP 2010 | DOI: 10.1002/chem.201001721

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      Addition of anionic nucleophiles (Cl, nBu) to free BIMIONAP and BIMIONAP-containing palladium complexes results in selective cleavage of the N2C[BOND]P bond, from which the released N-heterocyclic carbene (NHC) fragment can be trapped by protonation, hydrolysis, sulfurization, or coordination to PdII centers (see scheme).

    3. Domino Reactions

      An Ir–Pt Catalyst for the Multistep Preparation of Functionalized Indoles from the Reaction of Amino Alcohols and Alkynyl Alcohols (pages 13109–13115)

      Alessandro Zanardi, Dr. Jose A. Mata and Prof. Eduardo Peris

      Version of Record online: 30 SEP 2010 | DOI: 10.1002/chem.201001180

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      Three in one: A heterodimetallic complex of Ir–Pt (see graphic) with a triazolyldiylidene linker has been obtained and fully characterized. The complex brings together some of the catalytic properties typically shown by Ir and Pt catalysts. A multistep reaction employing the Ir-mediated oxidative cyclization of 2-(ortho-aminophenyl)ethanol and the Pt-catalyzed cyclization–addition of alkynyl alcohols to indoles is reported.

    4. Brønsted Acids

      Synthesis and Structural Aspects of N-Triflylphosphoramides and Their Calcium Salts—Highly Acidic and Effective Brønsted Acids (pages 13116–13126)

      Prof. Dr. Magnus Rueping, Dr. Boris J. Nachtsheim, Dipl.-Chem. René M. Koenigs and Dr. Winai Ieawsuwan

      Version of Record online: 4 OCT 2010 | DOI: 10.1002/chem.201001438

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      Freedom! The synthesis and structure determination of various 1,1′-bi-2-naphthol (BINOL)-based N-triflylphosphoramides and their corresponding calcium salts is presented. A simple acidic treatment of the calcium salts provides the metal-free Brønsted acids (see scheme; Tf=trifluoromethanesulfonyl).

    5. Charge Transfer

      Tuning the HOMO Energy Levels of Organic Dyes for Dye-Sensitized Solar Cells Based on Br/Br3 Electrolytes (pages 13127–13138)

      Chao Teng, Prof. Xichuan Yang, Shifeng Li, Ming Cheng, Prof. Anders Hagfeldt, Prof. Li-zhu Wu and Prof. Licheng Sun

      Version of Record online: 4 OCT 2010 | DOI: 10.1002/chem.201000460

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      A new middleman: The Br/Br3 redox mediator was proved to be a promising alternative to I/I3 for application in dye-sensitized solar cells (see graphic). Studies show that the energy gap between the HOMO level of the dye and the potential of the Br/Br3 redox mediator influences their charge-transfer processes and solar-energy conversion efficiency.

    6. Ionic Liquids

      Synthesis of Room-Temperature Ionic Liquids with the Weakly Coordinating [Al(ORF)4] Anion (RF=C(H)(CF3)2) and the Determination of Their Principal Physical Properties (pages 13139–13154)

      Dipl.-Chem. Safak Bulut, Petra Klose, M. Sc. Mian-Mian Huang, Prof. Dr. Hermann Weingärtner, Prof. Dr. Paul J. Dyson, Dr. Gábor Laurenczy, Prof. Dr. Christian Friedrich, Jakob Menz, Prof. Dr. Klaus Kümmerer and Prof. Dr. Ingo Krossing

      Version of Record online: 30 SEP 2010 | DOI: 10.1002/chem.201000982

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      New RTILs: A series of ionic liquids (ILs) based on the weakly coordinating anion [Al(hfip)4] (see figure) has been synthesized and thoroughly characterized. The ILs were found to have widely interesting properties that suggest potential for these ILs in many applications (hfip=hexafluoroisopropoxy).

    7. Electron Affinities

      Electron Attachment to a Hydrated DNA Duplex: The Dinucleoside Phosphate Deoxyguanylyl-3′,5′-Deoxycytidine (pages 13155–13162)

      Prof. Jiande Gu, Prof. Ning-Bew Wong, Dr. Yaoming Xie and Prof. F. Henry Schaefer III

      Version of Record online: 4 OCT 2010 | DOI: 10.1002/chem.201001306

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      DNA electron captors: The minimal essential skeletal section of DNA helices, [dGpdC]2, has been constructed, fully optimized, and analyzed by a quantum mechanical approach at a reliable level of theory (see image), showing that DNA double strands are capable of capturing low-energy electrons and forming electronically stable radical anions. The structural features of the optimized radical anion [dGpdC]2. also suggest the possibility of interstrand proton transfer.

    8. Microarrays

      Construction of N-Glycan Microarrays by Using Modular Synthesis and On-Chip Nanoscale Enzymatic Glycosylation (pages 13163–13175)

      Dr. Sonia Serna, Dr. Juan Etxebarria, Dr. Nerea Ruiz, Prof. Dr. Manuel Martin-Lomas and Dr. Niels-Christian Reichardt

      Version of Record online: 28 SEP 2010 | DOI: 10.1002/chem.201001295

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      Go nano! Arrays of immobilised carbohydrates can be enzymatically processed with the help of glycosyl transferases in nanodroplets placed on top of individual spots. This methodology opens the way for the stereospecific on-chip construction of glycan arrays with very high ligand densities by using immobilised synthetic glycan scaffolds and minute amounts of recombinant glycosyltransferases (see figure).

    9. Carbon Nanotubes

      Determination of the Surfactant Density on SWCNTs by Analytical Ultracentrifugation (pages 13176–13184)

      Claudia Backes, Dr. Engin Karabudak , Cordula D. Schmidt, Dr. Frank Hauke, Prof. Dr. Andreas Hirsch and Dr. Wendel Wohlleben

      Version of Record online: 28 SEP 2010 | DOI: 10.1002/chem.200903461

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      Nanotube detergents: Deep insights into the arrangement of various surfactants noncovalently bound to the sidewall of single-walled carbon nanotubes (SWCNTs, see figure) have been obtained by analysis of the sedimentation coefficients with analytical ultracentrifugation. The investigation included classical detergents, as well as synthesized perylene-based surfactants.

    10. Enhanced Adsorption Affinity of Anionic Perylene-Based Surfactants towards Smaller-Diameter SWCNTs (pages 13185–13192)

      Claudia Backes, Udo Mundloch, Cordula D. Schmidt, Prof. Dr. Jonathan N. Coleman, Dr. Wendel Wohlleben, Dr. Frank Hauke and Prof. Dr. Andreas Hirsch

      Version of Record online: 28 SEP 2010 | DOI: 10.1002/chem.201000232

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      Nanotube surfactant design: The interactions of synthesized perylene-based surfactants with single-walled carbon nanotubes (SWCNTs) of various diameters have been investigated. The surfactants exhibit an enhanced adsorption affinity towards smaller-diameter SWCNTs (see figure), which could be of great importance for future nanotube separation by selective dispersion.

    11. Amine Alkylation

      New Iridium Catalysts for the Efficient Alkylation of Anilines by Alcohols under Mild Conditions (pages 13193–13198)

      Stefan Michlik and Prof. Dr. Rhett Kempe

      Version of Record online: 7 OCT 2010 | DOI: 10.1002/chem.201001871

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      Selective amine alkylation: The synthesis of eight new iridium complexes containing anionic P,N ligands (see image) is described. These new complexes were used as highly active catalysts for the selective monoalkylation of anilines with primary alcohols, and gave nearly quantitative conversion under mild reaction conditions.

    12. Nucleophilic Addition

      Syntheses and Photochromic Studies of Dithienylethene-Containing Imidazolium Derivatives and Their Reactivity towards Nucleophiles (pages 13199–13209)

      Dr. Gongping Duan, Dr. Nianyong Zhu and Prof. Dr. Vivian Wing-Wah Yam

      Version of Record online: 4 OCT 2010 | DOI: 10.1002/chem.201001319

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      An open-and-shut case: A series of photochromic dithienylethene-containing imidazolium salts has been synthesized. The reactivities of these imidazolium derivatives towards nucleophiles show significant differences between their open and closed forms (see scheme).

    13. Crystal Growth

      Sb2S3 with Various Nanostructures: Controllable Synthesis, Formation Mechanism, and Electrochemical Performance toward Lithium Storage (pages 13210–13217)

      Dr. Jianmin Ma, Dr. Xiaochuan Duan, Dr. Jiabiao Lian, Dr. Tongil Kim, Dr. Peng Peng, Dr. Xiaodi Liu, Zhifang Liu, Haobo Li and Prof. Wenjun Zheng

      Version of Record online: 7 OCT 2010 | DOI: 10.1002/chem.201000962

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      How do your crystals grow? Morphology control of Sb2S3 crystals (see figure) could be realized by using a solution-phase route, through manipulating the interaction between the solvent, additive, and nanostructures. In addition, the as-synthesized Sb2S3 nanomaterials are also shown to be improved electrode materials for lithium ion batteries.

    14. Nucleic Acids

      HgII Ion Specifically Binds with T:T Mismatched Base Pair in Duplex DNA (pages 13218–13225)

      Prof. Hidetaka Torigoe, Prof. Akira Ono and Tetsuo Kozasa

      Version of Record online: 30 SEP 2010 | DOI: 10.1002/chem.201001171

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      Mercury rising: We have investigated the binding mode between HgII ions and the T:T mismatched base pair. HgII ions surrounded by structured water molecules can be dehydrated, and the two protons at the N3 positions of T:T can then be released, as shown in the scheme. Dehydrated HgII ions can then bind with the deprotonated thymine bases to form N3-Hg-N3.

    15. Radical Reactions

      Mechanism of the Catalytic Deperoxidation of tert-Butylhydroperoxide with Cobalt(II) Acetylacetonate (pages 13226–13235)

      Natascia Turrà, Ulrich Neuenschwander, Prof. Dr. Alfons Baiker, Prof. Dr. Jozef Peeters and Prof. Dr. Ive Hermans

      Version of Record online: 13 OCT 2010 | DOI: 10.1002/chem.201000489

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      Autoinhibition: CoII ions initiate a radical-chain deperoxidation of tert-butylhydroperoxide propagated by peroxyl and alkoxyl radicals (see picture). The CoII ion is thereby converted into a CoIII[BOND]OH species, which can either induce initiation upon reaction with ROOH or termination upon the mutual association reaction of two CoIII[BOND]OH species. This behavior results in maximum deperoxidation activity as a function of the total cobalt concentration.

    16. Solvent-Free Oxidation

      Switchable Selectivity during Oxidation of Anilines in a Ball Mill (pages 13236–13242)

      Rico Thorwirth, Dr. Franziska Bernhardt, Dr. Achim Stolle, Prof. Bernd Ondruschka and Dr. Jila Asghari

      Version of Record online: 4 OCT 2010 | DOI: 10.1002/chem.201001702

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      Grinding reactions: Highly efficient oxidative homocoupling of aromatic amines was performed under solvent-free conditions in a planetary ball mill (see scheme). The choice of solid oxidants and grinding auxiliaries allowed selective generation of the oxidized products. Other methods of energy input are compared with respect to reaction time and energy consumption.

    17. Synthetic Methods

      Metal-Catalyzed Cycloetherification Reactions of β,γ- and γ,δ-Allendiols: Chemo-, Regio-, and Stereocontrol in the Synthesis of Oxacycles (pages 13243–13252)

      Prof. Dr. Benito Alcaide, Dr. Pedro Almendros, Dipl.-Chem. Rocío Carrascosa and Dr. Teresa Martínez del Campo

      Version of Record online: 28 SEP 2010 | DOI: 10.1002/chem.201001520

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      Diversely functionalized enantiopure tetrahydrofurans, dihydropyrans, and tetrahydrooxepines are prepared by using a chemo-, regio-, and stereoselective methodology. This approach involves controlled Pd-, Pt-, Au-, or La-catalyzed oxycyclization reactions of β,γ- and γ,δ-allenic diols (see scheme; FG=functional group, Z=protecting group).

    18. Polyoxometalates

      A Series of Vanadogermanates from 1D Chain to 3D Framework Built by Ge–V–O Clusters and Transition-Metal-Complex Bridges (pages 13253–13261)

      Dr. Jian Zhou, Prof. Dr. Jie Zhang, Wei-Hui Fang and Prof. Dr. Guo-Yu Yang 

      Version of Record online: 4 OCT 2010 | DOI: 10.1002/chem.201001434

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      Extended vanadogermanates (VGOs) with 1-, 2- and 3D structures have been made under hydro(solvo)thermal conditions. The 1D chain is the first dicadmium-substituted VGO built from {Cd2Ge8V12O40(OH)8(H2O)} clusters and transition-metal-complex (TMC) bridges (pictured), and the layer and framework are the first 2D/3D VGOs made of TMC linkers and {Ge6V15O48(H2O)}/{Ge4V16O42(OH)4(H2O)} clusters.

    19. Natural Products

      Oxidative Spirocyclization of Phenolic Sulfonamides: Scope and Applications (pages 13262–13270)

      Huan Liang and Prof. Dr. Marco A. Ciufolini

      Version of Record online: 7 OCT 2010 | DOI: 10.1002/chem.201001402

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      Making building blocks: The oxidative dearomatization of para- and ortho-phenolic sulfonamides provides building blocks for spirocyclic alkaloids (see scheme). The chemistry of the products of this reaction and a concise total synthesis of putative lepadiformine is given.

    20. Hydrogen Bonds

      Fluorescence Spectroscopic Evidence for Hydrogen Bonding and Deprotonation Equilibrium between Fluoride and a Thiourea Derivative (pages 13271–13277)

      Pichandi Ashokkumar, Prof. Dr. Vayalakkavoor T. Ramakrishnan and Prof. Dr. Perumal Ramamurthy

      Version of Record online: 4 OCT 2010 | DOI: 10.1002/chem.201000837

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      Anion-receptor dynamics: Anion-receptor H-bonding and deprotonation equilibrium was studied by fluorescence spectroscopic techniques. Three different emission maxima are observed, which correspond to the free receptor, H-bonded complex and deprotonated species (see figure). Existence of these three species and their equilibrium were confirmed by time-resolved emission spectroscopic studies.

  10. Preview

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Concept
    7. Communications
    8. Retraction
    9. Communications
    10. Full Papers
    11. Preview
    1. You have free access to this content
      Preview: Chem. Eur. J. 45/2010 (page 13283)

      Version of Record online: 15 NOV 2010 | DOI: 10.1002/chem.201090221

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