Angewandte Chemie International Edition

Cover image for Angewandte Chemie International Edition

August 20, 2007

Volume 46, Issue 33

Pages 6201–6379

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Obituary
    7. Book Review
    8. Highlight
    9. Minireview
    10. Review
    11. Communications
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    1. Cover Picture: Multiphoton Fabrication (Angew. Chem. Int. Ed. 33/2007) (page 6201)

      Christopher N. LaFratta, John T. Fourkas, Tommaso Baldacchini and Richard A. Farrer

      Version of Record online: 13 AUG 2007 | DOI: 10.1002/anie.200790161

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      Multiphoton fabrication makes possible the creation of arbitrarily complex, three-dimensional structures with feature sizes of 100 nm or less from a range of different materials. In their Review on page 6238 ff., J. T. Fourkas and co-workers discuss the development of the technique since its inception less than a decade ago, as well as materials and methods used, and applications for functional microdevices.

  2. Inside Cover

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Obituary
    7. Book Review
    8. Highlight
    9. Minireview
    10. Review
    11. Communications
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    1. Inside Cover: A Catalytic Method for Converting Vinylic Furanoses into Cyclopentenones (Angew. Chem. Int. Ed. 33/2007) (page 6202)

      Julien Petrignet, Ireddy Prathap, Srivari Chandrasekhar, Jhillu Singh Yadav and René Grée

      Version of Record online: 13 AUG 2007 | DOI: 10.1002/anie.200790162

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      The shape of the Mont Saint Michel, which lies on the French coast between Brittany and Normandy, resembles the potential energy curves of some chemical reactions. In their Communication on page 6297 ff., R. Grée et al. present one such reaction—an iron-catalyzed transposition of vinylic furanoses into cyclopentenones, which are useful intermediates, for example, in the total synthesis of prostaglandins.

  3. Graphical Abstract

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Obituary
    7. Book Review
    8. Highlight
    9. Minireview
    10. Review
    11. Communications
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  4. News

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Obituary
    7. Book Review
    8. Highlight
    9. Minireview
    10. Review
    11. Communications
    12. Preview
  5. Obituary

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Obituary
    7. Book Review
    8. Highlight
    9. Minireview
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    1. Charles Mioskowski (1946–2007) (page 6220)

      Alain Wagner, Bernard Rousseau and Véronique Gouverneur

      Version of Record online: 13 AUG 2007 | DOI: 10.1002/anie.200703070

  6. Book Review

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Obituary
    7. Book Review
    8. Highlight
    9. Minireview
    10. Review
    11. Communications
    12. Preview
  7. Highlight

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Obituary
    7. Book Review
    8. Highlight
    9. Minireview
    10. Review
    11. Communications
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    1. Supramolecular Bioinorganic Chemistry: Model Complexes of Cytochrome c Oxidase Meet Functional Surfaces (pages 6222–6224)

      Martin Bröring

      Version of Record online: 16 JUL 2007 | DOI: 10.1002/anie.200702254

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      Researchers came one step closer to understanding the mysterious complexity of the O2-reducing site in cytochrome c oxidase. Realization of the individual tasks fulfilled by the components of this enzyme pocket became possible by electrocatalytic measurements on model-complex-modified gold electrodes under conditions of slow electron flux.

  8. Minireview

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    4. Graphical Abstract
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    1. DNA–Metal Base Pairs (pages 6226–6236)

      Guido H. Clever, Corinna Kaul and Thomas Carell

      Version of Record online: 19 JUL 2007 | DOI: 10.1002/anie.200701185

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      Metallogenetic code: With the development of the metal–base pair concept it has recently become possible to selectively incorporate metal ions into the core of the DNA double helix. It is possible to stack up to ten metal ions in a double helix, and different metal ions can be incorporated in a programmable fashion. A wide range of applications are forseeable in nanotechnology.

  9. Review

    1. Top of page
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    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Obituary
    7. Book Review
    8. Highlight
    9. Minireview
    10. Review
    11. Communications
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    1. Multiphoton Fabrication (pages 6238–6258)

      Christopher N. LaFratta, John T. Fourkas, Tommaso Baldacchini and Richard A. Farrer

      Version of Record online: 24 JUL 2007 | DOI: 10.1002/anie.200603995

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      Now in 3D! Whereas conventional microfabrication techniques are essentially two dimensional, new schemes based on multiphoton absorption open up the third dimension, making it possible to create arbitrarily complex three-dimensional microstructures.

  10. Communications

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Obituary
    7. Book Review
    8. Highlight
    9. Minireview
    10. Review
    11. Communications
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    1. Molecular Wire Encapsulated into π Organogels: Efficient Supramolecular Light-Harvesting Antennae with Color-Tunable Emission (pages 6260–6265)

      Ayyappanpillai Ajayaghosh, Vakayil K. Praveen, Chakkooth Vijayakumar and Subi J. George

      Version of Record online: 2 JUL 2007 | DOI: 10.1002/anie.200701925

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      Reaping the benefit: A supramolecular light-harvesting antenna has been developed by encapsulating small amounts of a π-conjugated oligomer (molecular wire) within a self-assembled gel-forming donor scaffold. The supramolecular tapes of oligo(p-phenylenevinylene)s facilitate fast exciton migration and funneling of the excitation energy to the encapsulated molecular wire, thereby resulting in intense red emission (see picture).

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      Photochromic Rhodamines Provide Nanoscopy with Optical Sectioning (pages 6266–6270)

      J. Fölling, V. Belov, R. Kunetsky, R. Medda, A. Schönle, A. Egner, C. Eggeling, M. Bossi and S. W. Hell

      Version of Record online: 19 JUL 2007 | DOI: 10.1002/anie.200702167

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      Exciting developments: Switching individual photochromic and fluorescent rhodamine amides enables 3D far-field optical microscopy with nanoscale resolution, excellent signal-to-noise ratio, and fast acquisition times. The rhodamine amides can be switched on using two photons, which enables 3D detailed imaging of thick and densely stained samples (such as 5-μm silica beads (see image) and living cells) to be constructed.

    3. Protonation-Induced Cyclocondensation of 1-Aryl Ethynylanthraquinones: Expanding the π Conjugation (pages 6271–6274)

      Mio Kondo, Maai Uchikawa, Wen-Wei Zhang, Kosuke Namiki, Shoko Kume, Masaki Murata, Yoshio Kobayashi and Hiroshi Nishihara

      Version of Record online: 19 JUL 2007 | DOI: 10.1002/anie.200701766

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      Just add a proton: The cyclocondensation of 1-aryl ethynylanthraquinones in the presence of a strong organic acid proceeds almost quantitatively to give oxodihydrodibenzochromenylium compounds (see scheme for a 1-ferrocenyl derivative; blue C, red O, purple Fe). Expansion of the π-conjugated system of the starting anthraquinones causes a lowering of the π* orbital and promotes intramolecular electron transfer.

    4. Structural and Electronic Properties of Pristine and Ba-Doped Clathrate-Like Carbon Fullerenes (pages 6275–6277)

      Jianjun Yang, J. S. Tse, Y. Yao and T. Iitaka

      Version of Record online: 16 JUL 2007 | DOI: 10.1002/anie.200701555

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      Endorsed doping: Calculations on the recently characterized cuboid C60 fullerene (see picture) confirm that it is metallic. Doping of Ba atoms into the cage and interstitial sites of cuboid C60 cages is shown theoretically to be energetically favorable. The changes in electronic properties that result from Ba doping suggest that cuboid C60 might be an important electronic material for technological applications.

    5. Evidence for a Common Non-Heme Chelatable-Iron-Dependent Activation Mechanism for Semisynthetic and Synthetic Endoperoxide Antimalarial Drugs (pages 6278–6283)

      Paul A. Stocks, Patrick G. Bray, Victoria E. Barton, Mohammed Al-Helal, Michael Jones, Nuna C. Araujo, Peter Gibbons, Stephen A. Ward, Ruth H. Hughes, Giancarlo A. Biagini, Jill Davies, Richard Amewu, Amy E. Mercer, Gemma Ellis and Paul M. O'Neill

      Version of Record online: 19 JUL 2007 | DOI: 10.1002/anie.200604697

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      The iron-y of fate: Isobole analyses of fluorescently labeled antimalarial endoperoxides with chelators selective for non-heme iron, and laser confocal microscopy studies within living malaria parasites have shown that the semisynthetic analogues of artemisinin and synthetic endoperoxides (see example) share a common mechanism of action involving chelatable-iron-mediated bioactivation (see images) and irreversible alkylation of parasite targets.

    6. A Highly Selective, High-Speed, and Hydrolysis-Free O-Acylation in Subcritical Water in the Absence of a Catalyst (pages 6284–6288)

      Masahiro Sato, Keiichiro Matsushima, Hajime Kawanami and Yutaka Ikuhsima

      Version of Record online: 19 JUL 2007 | DOI: 10.1002/anie.200700180

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      Fast and furious: A wide range of alcohols are acylated by acetic anhydride, in the absence of catalyst, in subcritical water in a flow-type microreaction system. The esters are selectively produced in high yields at temperatures of 200 to 250 °C. Varying the amount of acetic anhydride added with respect to the alcohols allows the regioselective acylation of one or both hydroxy groups of various dihydroxy compounds (see picture).

    7. Improved Designs of Metal–Organic Frameworks for Hydrogen Storage (pages 6289–6292)

      Sang Soo Han, Wei-Qiao Deng and William A. Goddard III

      Version of Record online: 18 JUL 2007 | DOI: 10.1002/anie.200700303

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      Quick on the uptake: The metal–organic framework Mg-MOF-C30 (see picture) contains Mg4O(CO2)6 building units (pink) and aromatic organic linkers containing 30 carbon atoms (teal). This material leads to 8.08 wt % H2 uptake at 77 K and 20 bar, the highest among investigated MOF structures.

    8. Neutral Ligands with Exceptional Donor Ability for Palladium-Catalyzed Alkene Hydrogenation (pages 6293–6296)

      Marion Heckenroth, Evelyne Kluser, Antonia Neels and Martin Albrecht

      Version of Record online: 13 JUL 2007 | DOI: 10.1002/anie.200702199

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      With four site: Catalytic olefin hydrogenation is observed with palladium complexes when the N-heterocyclic carbene ligand is changed from the normal C2- to the unusual C4-bonding mode (see scheme). In a cis coordinating framework, the electron density at the metal center is substantially increased as a result of the exceptionally strong donor ability of C4-bound carbenes.

    9. A Catalytic Method for Converting Vinylic Furanoses into Cyclopentenones (pages 6297–6300)

      Julien Petrignet, Ireddy Prathap, Srivari Chandrasekhar, Jhillu Singh Yadav and René Grée

      Version of Record online: 2 JUL 2007 | DOI: 10.1002/anie.200701663

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      From sugars to carbocycles: Pentacarbonyl iron is a cheap and efficient catalyst for mediating an isomerization–aldolization–dehydration sequence that converts vinyl sugars into cyclopentenones, which are very useful intermediates in the total synthesis of various types of bioactive molecules.

    10. Cation-Dependent Nonlinear Optical Behavior in an Octupolar 3D Anionic Metal–Organic Open Framework (pages 6301–6304)

      Yan Liu, Gao Li, Xing Li and Yong Cui

      Version of Record online: 19 JUL 2007 | DOI: 10.1002/anie.200701056

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      A holey host: An octupolar porous metal–organic framework with a Td-symmetric supercage structure (see picture; green: center of the octapolar structure) exhibits a powder second harmonic generation (SHG) intensity about 15 times higher than that of KH2PO4. This anionic open framework is highly thermally stable, displays high ion-exchange capacities with the cations NH4+, Na+, and K+, and, more importantly, exhibits an unprecedented cation-dependent NLO activity.

    11. Copper β-Diketonate Molecular Squares and Their Host–Guest Reactions (pages 6305–6308)

      Chandi Pariya, Christopher R. Sparrow, Chang-Keun Back, Giselle Sandí, Frank R. Fronczek and Andrew W. Maverick

      Version of Record online: 19 JUL 2007 | DOI: 10.1002/anie.200701252

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      All square: Treatment of m-phenylenebis(β-diketones) with [Cu(NH3)4]2+ yields molecular squares rather than the expected hexagons. The squares react readily with guests such as C60 (see structure) and 4,4′-bipyridine. They are also effective for the storage of H2 gas, both at 77 K and at room temperature.

    12. Oxidatively Induced Methyl Transfer from Boron to Platinum in Dimethyldi(2-pyridyl)boratoplatinum Complexes (pages 6309–6312)

      Eugene Khaskin, Peter Y. Zavalij and Andrei N. Vedernikov

      Version of Record online: 19 JUL 2007 | DOI: 10.1002/anie.200701257

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      A hydroxlic solvent promoted reaction: Boron-to-platinum methyl-group transfer occurs in the title complexes in the presence of an oxidant (O2 or MeI) and a protic solvent (water, alcohols; see scheme). With MeI as oxidant the reaction intermediate is shown to be a five-coordinate PtIV species containing a Pt⋅⋅⋅CH agostic interaction.

    13. A Diaminocarbene–Phosphonium Ylide: Direct Access to C,C Chelating Ligands (pages 6313–6315)

      Yves Canac, Carine Duhayon and Remi Chauvin

      Version of Record online: 16 JUL 2007 | DOI: 10.1002/anie.200701490

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      Captured and surrounded by C: A strongly σ-donating C,C ligand and an allyl ligand surround the palladium center in the complex shown in the scheme. The chelate, with three different types of carbon atoms, is soluble and stable in water and readily accessible on a multigram scale. It serves as the precursor to an efficient catalyst for Tsuji–Trost allylic substitution. Tf=trifluoromethanesulfonyl.

    14. Real-Time Observation of a Molecular Reaction Mechanism of Aqueous 5-Halo-2′-deoxyuridines under UV/Ionizing Radiation (pages 6316–6320)

      Chun-Rong Wang and Qing-Bin Lu

      Version of Record online: 18 JUL 2007 | DOI: 10.1002/anie.200701559

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      Life's not too short: 5-Halo-2′-deoxyuridines (XdUs) have been tested as hypoxic radiosensitizers in cancer therapy, but their molecular reaction mechanism is poorly understood. Time-resolved femtosecond laser spectroscopic measurements show that dissociative attachment of prehydrated electrons (epre) to XdUs is responsible for the formation of a reactive radical dU. that causes the radiosensitivity enhancement. ehyd=hydrated electron.

    15. One-Pot Synthesis of Amphiphilic Polymeric Janus Particles and Their Self-Assembly into Supermicelles with a Narrow Size Distribution (pages 6321–6324)

      Lei Nie, Shiyong Liu, Wenming Shen, Daoyong Chen and Ming Jiang

      Version of Record online: 19 JUL 2007 | DOI: 10.1002/anie.200700209

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      Not just a pretty structure: Water-dispersible hybrid nanotubes were used as a desymmetrization tool to prepare Janus nanoparticles consisting of a hydrophobic sphere with water-soluble polymer chains grafted on one side (see picture). The Janus micelles undergo self-assembly to form supermicelles with a flowerlike morphology in which the constituent Janus particles are the “petals”.

    16. Heck-Type Cyclization of Oxime Ethers: Stereoselective Carbon–Carbon Bond Formation with Aryl Halides To Produce Heterocyclic Oximes (pages 6325–6328)

      Hiroaki Ohno, Akimasa Aso, Yoichi Kadoh, Nobutaka Fujii and Tetsuaki Tanaka

      Version of Record online: 19 JUL 2007 | DOI: 10.1002/anie.200701868

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      Irrespective of the isomeric ratio of the starting material, the palladium-catalyzed cyclization of oxime ethers with an aryl halide moiety proceeds in a highly Z-selective manner to give indolin-3-one O-alkyl oximes in good yields (see scheme). The reaction is also applicable to the construction of benzofuran-3-one and fused-indole frameworks. R1=H, Me, OMe, CO2Me; R2=Me, benzyl; Ts=p-toluenesulfonyl.

    17. Controlled Synthesis and Chemical Conversions of FeO Nanoparticles (pages 6329–6332)

      Yanglong Hou, Zhichuan Xu and Shouheng Sun

      Version of Record online: 23 JUL 2007 | DOI: 10.1002/anie.200701694

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      Shaping up for conversion: Monodisperse FeO nanoparticles were synthesized by reductive decomposition of iron(III) acetylacetonate with oleic acid (OA) and oleylamine (OAm). The nanoparticle sizes were tunable from 14 to 100 nm and their shapes were controlled to be either spherical or truncated octahedral (see images). The FeO nanoparticles were converted into diverse FexOy nanoparticles, which have potential in magnetic and catalytic applications.

    18. A General Strategy for Synthesizing FePt Nanowires and Nanorods (pages 6333–6335)

      Chao Wang, Yanglong Hou, Jaemin Kim and Shouheng Sun

      Version of Record online: 22 JUN 2007 | DOI: 10.1002/anie.200702001

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      Length made to order: Controlled reduction of [Pt(acac)2] and decomposition of [Fe(CO)5] in a mixture of oleylamine and octadecene leads to the facile synthesis of FePt nanowires and nanorods with diameters of 2–3 nm (see TEM image). The length of the nanowires/nanorods is tunable from greater than 200 nm down to 20 nm by simply controlling the volume ratio of oleylamine and octadecene.

    19. Intermolecular Hydrogen Bonding Modulates the Hydrogen-Atom-Donating Ability of Hydroquinones (pages 6336–6338)

      Riccardo Amorati, Paola Franchi and Gian Franco Pedulli

      Version of Record online: 19 JUL 2007 | DOI: 10.1002/anie.200701957

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      Radical measures: Kinetic measurements on peroxyl radicals showed that the reactivity of a 1,4-dihydroxybenzene is enhanced by the selective interaction of one OH group with a cosolvent molecule (see scheme; S=DMSO, 2.3 mM). The preferential solvation of the radical over the parent phenol causes a decrease in the bond dissociation enthalpy of the free OH group and an increase in the rate constant for abstraction of a hydrogen atom.

    20. Trifluoromethyl Coordination and C[BOND]F Bond Activation at Calcium (pages 6339–6342)

      Anthony G. M. Barrett, Mark R. Crimmin, Michael S. Hill, Peter B. Hitchcock and Panayiotis A. Procopiou

      Version of Record online: 19 JUL 2007 | DOI: 10.1002/anie.200701945

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      Fluoral arrangement: The calcium β-diketiminate complex 1 (see scheme) not only exhibits an unexpected and unprecedented binding mode of a CF3 group, from which one fluorine atom coordinates to the Ca center, but also undergoes C[BOND]F bond cleavage through the formation of a heteroleptic calcium fluoride complex.

    21. Abnormally Bound N-Heterocyclic Carbene Complexes of Ruthenium: C[BOND]H Activation of Both C4 and C5 Positions in the Same Ligand (pages 6343–6345)

      Charles E. Ellul, Mary F. Mahon, Olly Saker and Michael K. Whittlesey

      Version of Record online: 13 JUL 2007 | DOI: 10.1002/anie.200701930

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      A bit unusual: “Abnormal” carbene formation from a free monodentate N-heterocyclic carbene occurs upon the room temperature reaction of [Ru3(CO)12] with 1,3-di-tert-butylimidazol-2-ylidene. Subsequent heating leads to C[BOND]H activation at the remaining C5 position to afford a μ3-bridging heterocycle, which is eliminated as imidazolium upon reaction with H2.

    22. [Me3Si][R-CB11F11]—Synthesis and Properties (pages 6346–6349)

      Torsten Küppers, Eduard Bernhardt, Reint Eujen, Helge Willner and Christian W. Lehmann

      Version of Record online: 20 JUL 2007 | DOI: 10.1002/anie.200701136

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      Trimethylsilyl cations in a molten salt: The weakly coordinating anions [RCB11F11] (R=H, C2H5; see structure; F green, B orange, Si gray, C black) stabilize the [Me3Si]+ cation so well that the 1H, 13C, and 29Si NMR spectroscopic parameters could be measured in the melt without using a solvent. The crystal structures and the synthesis of the solid super acids H[RCB11F11] (R=H, C2H5) are also reported.

    23. Phenanthroline Ligands in Aryl Palladium Hydrazinato Complexes: Catalysts for Efficient Coupling of Azo Componds with Aryl Boronic Acids (pages 6350–6353)

      Kilian Muñiz and Alvaro Iglesias

      Version of Record online: 19 JUL 2007 | DOI: 10.1002/anie.200700288

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      An easy couple: A new protocol for the synthesis of N-arylated amides, based on a coupling between azodicarboxylates and aryl boronic acids, has been developed (see scheme). Palladadiaziridines serve as catalysts for this process and the key step consists of a reductive elimination from a hydrazinato palladium aryl intermediate that shows an unprecedented reactivity for this class of compounds in aryl–amide bond formation.

    24. Unexpected Reactions of [Ag(NCCH3)3][(V2O3)2(RPO3)4⊂F] Cage Compounds with H2 and NO (pages 6354–6356)

      Jabor K. Jabor, Reinhard Stößer, Nguyen Huu Thong, Burkhard Ziemer and Manfred Meisel

      Version of Record online: 19 JUL 2007 | DOI: 10.1002/anie.200701211

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      Highly adaptable: Vanadium cage compounds templated on F (see picture) offer unique possibilities for tuning properties and exhibit unexpected redox behavior with respect to NO and H2. When adsorbed on the surface of γ-Al2O3 coated with Ag+, they react in the singlet state with both NO and H2. In both cases, the vanadium mixed-valence state of the cage could be identified by EPR spectroscopy.

    25. Charge-Transfer Chromophores by Cycloaddition–Retro-electrocyclization: Multivalent Systems and Cascade Reactions (pages 6357–6360)

      Milan Kivala, Corinne Boudon, Jean-Paul Gisselbrecht, Paul Seiler, Maurice Gross and François Diederich

      Version of Record online: 20 JUL 2007 | DOI: 10.1002/anie.200701733

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      It all clicks into place: The cycloaddition of tetracyanoethylene (TCNE) to electron-rich alkynes (“click” reaction) followed by retro-electrocyclization affords multivalent charge-transfer chromophores that accept up to 24 electrons. The cascade additions of TCNE and tetrathiafulvalene (TTF) to polyynes provides access to conjugated donor–acceptor-substituted [AB] oligomers with promising optoelectronic properties (see scheme).

    26. Enantioselective Synthesis of Arglabin (pages 6361–6363)

      Srinivas Kalidindi, Won Boo Jeong, Andreas Schall, Rakeshwar Bandichhor, Bernd Nosse and Oliver Reiser

      Version of Record online: 16 JUL 2007 | DOI: 10.1002/anie.200701584

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      Closing the ring: The first enantioselective synthesis of the guanianolide natural product arglabin and its dimethylamino adduct, which shows promising results in the treatment of various tumors, has been achieved. Key steps include a CuI-catalyzed asymmetric cyclopropanation, a stereoselective Sakurai allylation with a retroaldol/lactonization cascade, and a second Sakurai allylation with ring-closing metathesis (RCM).

    27. Ruthenium(IV) Alkylidenes as Precatalysts for Direct Arylations of Alkenes with Aryl Chlorides and an Application to Sequential Catalysis (pages 6364–6367)

      Lutz Ackermann, Robert Born and Paula Álvarez-Bercedo

      Version of Record online: 19 JUL 2007 | DOI: 10.1002/anie.200701727

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      Jack of all trades? A ruthenium(IV) carbene complex catalyzes the diastereoselective direct arylation of alkenes using aryl chlorides with high efficiency, which sets the stage for the development of a direct arylation–hydrosilylation sequence (see scheme).

    28. An Air-Stable Organometallic Low-Molecular-Mass Gelator: Synthesis, Aggregation, and Catalytic Application of a Palladium Pincer Complex (pages 6368–6371)

      Tao Tu, Wilfried Assenmacher, Herwig Peterlik, Ralf Weisbarth, Martin Nieger and Karl Heinz Dötz

      Version of Record online: 19 JUL 2007 | DOI: 10.1002/anie.200701486

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      An efficient organometallic gelator can gel a variety of organic solvents even in concentrations as low as 0.2 wt %. π Stacking of the heteroarene moieties, van der Waals interactions between the alkyl chains, and metal–metal interactions may be responsible for the aggregation. This palladium pincer bis(carbene) complex (see scheme) is the first air-stable organometallic low-molecular-mass gelator that reveals promising catalytic activity in the gel state.

    29. Noble Gases Influence the Conductance of Cetineite-Type Nanoporous Semiconductors (pages 6372–6375)

      Dorota Sendor, Boniface P. T. Fokwa, Richard Dronskowski and Ulrich Simon

      Version of Record online: 19 JUL 2007 | DOI: 10.1002/anie.200700314

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      Recognizing nobility: The photoconduction of cetineites, crystalline nanoporous oxoselenoantimonates, is suppressed by the adsorption of noble gases. The gas uptake decreases with increasing atomic radius of the noble gas, leading to a smaller change in resistance upon adsorption. Thus, cetineites can be applied in noble-gas detection.

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    4. Graphical Abstract
    5. News
    6. Obituary
    7. Book Review
    8. Highlight
    9. Minireview
    10. Review
    11. Communications
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