Angewandte Chemie International Edition

Cover image for Vol. 44 Issue 48

December 9, 2005

Volume 44, Issue 48

Pages 7811–8077

    1. Cover Picture: Addressing the Metal Centers of [2×2] CoII4 Grid-Type Complexes by STM/STS (Angew. Chem. Int. Ed. 48/2005) (page 7811)

      Mohammad Sahabul Alam, Stefan Strömsdörfer, Viacheslav Dremov, Paul Müller, Jens Kortus, Mario Ruben and Jean-Marie Lehn

      Version of Record online: 8 DEC 2005 | DOI: 10.1002/anie.200590160

      “I find in the square … specific settings, divisible areas, number structures, possibilities of time, measure and rhythm as well as the essential form of color which can be placed in the square to interplay with number forms.” This statement by Alfred Jensen (his painting “The River Diagram” is shown in the cover picture) might also hold for research on molecular squares. In their Communication on page 7896 ff., M. Ruben, J.-M. Lehn, and P. Müller et al. describe the spectroscopic dissecting of a single molecular square into regions of different electronic properties by STM/STS techniques.

    2. Boron—A Meeting Point (pages 7826–7828)

      Holger Braunschweig and Daniela Rais

      Version of Record online: 8 DEC 2005 | DOI: 10.1002/anie.200503703

    3. Artificial Enzymes. Edited by Ronald Breslow. (pages 7829–7830)

      Morten Meldal

      Version of Record online: 8 DEC 2005 | DOI: 10.1002/anie.200585330

    4. The Discovery of Novel Metal-Induced Reactions of Nitrones: Not Only Electrophiles and Reagents for [3+2] Cycloadditions (pages 7832–7835)

      Francesca Cardona and Andrea Goti

      Version of Record online: 8 DEC 2005 | DOI: 10.1002/anie.200502640

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      Tales of the unexpected: A multitude of new reactions have been discovered for nitrones, the chemistry of which was considered well established. Two of them, a formal [3+3] cycloaddition and a pinacol-type coupling (see scheme) are induced by lanthanide derivatives and appear particularly promising and attractive for the synthesis of natural products and complex molecules.

    5. Adolf von Baeyer: Winner of the Nobel Prize for Chemistry 1905 (pages 7836–7840)

      Armin de Meijere

      Version of Record online: 8 DEC 2005 | DOI: 10.1002/anie.200503351

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      The 100th anniversary of the awarding of the Nobel Prize for Chemistry to Adolf von Baeyer (1835–1912) is drawing to a close. Nevertheless, his scientific work, especially that on organic dyes, C-nitroso compounds, and on hydroaromatic compounds have had and continue to have a profound effect on chemistry and on the chemical industry.

    6. Genotyping—From Genomic DNA to Genotype in a Single Tube (pages 7842–7849)

      Michael Strerath and Andreas Marx

      Version of Record online: 18 OCT 2005 | DOI: 10.1002/anie.200501444

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      G/C or A/T: that is the question! Nucleotide variations in the human genome, such as single-nucleotide polymorphisms (see picture), can be linked directly to diseases and also to side effects of drugs. Efficient, cost-effective processes that can be conducted in a closed reaction tube allow directly analysis of genomic DNA without preamplification.

    7. Nanoparticles as Recyclable Catalysts: The Frontier between Homogeneous and Heterogeneous Catalysis (pages 7852–7872)

      Didier Astruc, Feng Lu and Jaime Ruiz Aranzaes

      Version of Record online: 22 NOV 2005 | DOI: 10.1002/anie.200500766

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      The smaller, the better: Metal nanoparticle catalysis is an expanding area at the interface between homogeneous and heterogeneous catalysis. Moreover, its applications in the synthesis of fine organic chemicals, fuel-cell technology, and environmental issues are of growing importance. This Review shows the interdisciplinary character of this catalysis and presents the main recent advances. The picture shows the morphology of an electrosteric stabilized nanoparticle.

    8. UN213−: A Structurally Characterized Binary Actinide Heptaazide Anion (pages 7874–7878)

      Margaret-Jane Crawford, Arkady Ellern and Peter Mayer

      Version of Record online: 25 NOV 2005 | DOI: 10.1002/anie.200502484

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      More stable than it seems: The binary uranium–nitrogen anion U(N3)73− was synthesized and characterized as the (Bu4N)3[U(N3)7] salt. The U(N3)73− ion is the first structurally characterized heptaazide and is the first homoleptic azide of an actinide. The crystal structure shows a pentagonal-bipyramidal arrangement of the azide ligands around the central uranium(IV) atom (see structure; N: blue; U: green).

    9. Asymmetric Conjugate Addition of Organozinc Compounds to α,β-Unsaturated Aldehydes and Ketones with [2.2]Paracyclophaneketimine Ligands without Added Copper Salts (pages 7879–7881)

      Stefan Bräse and Sebastian Höfener

      Version of Record online: 17 NOV 2005 | DOI: 10.1002/anie.200501732

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      The ligand makes it possible: The asymmetric conjugate addition of diethylzinc to α,β-unsaturated aldehydes and ketones occurs with catalytic amounts of the paracyclophaneketimine ligand 1 without further additives.

    10. C[BOND]C Bond Activation by Octacarbonyldicobalt: [3+1] Cocyclizations of Methylenecyclopropanes with Carbon Monoxide (pages 7881–7884)

      Takuya Kurahashi and Armin de Meijere

      Version of Record online: 15 NOV 2005 | DOI: 10.1002/anie.200502596

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      Activation of C[BOND]C bonds in cyclopropanes with a cobalt complex: Methylenecyclopropanes react with one equivalent of [Co2(CO)8] under mild conditions to give 2-methylenecyclobutanones in moderate to good yields (up to 85 %). The reaction also proceeds with a catalytic amount of the cobalt complex under an atmosphere of CO (balloon) to give products in good yields (up to 90 %; see scheme).

    11. Si8(SitBu3)6: A Hitherto Unknown Cluster Structure in Silicon Chemistry (pages 7884–7887)

      Gerd Fischer, Volker Huch, Peter Mayer, Sham Kumar Vasisht, Michael Veith and Nils Wiberg

      Version of Record online: 15 NOV 2005 | DOI: 10.1002/anie.200501289

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      Inside out: Deiodination of R*3Si4I5 (R*=SitBu3) with NaR* affords the silicon compound Si8R*6. A Si2 dumbbell(Si1–Si2) is present in this novel cluster framework, embedded as in a sandwich compound between two Si3R*3 rings (see structure; the tBu methyl groups are not shown). The Si atoms of the dumbbell are “inverse-tetrahedrally” coordinated by four Si atoms.

    12. Coumarinylmethyl Esters for Ultrafast Release of High Concentrations of Cyclic Nucleotides upon One- and Two-Photon Photolysis (pages 7887–7891)

      Volker Hagen, Brigitte Dekowski, Vasilica Nache, Reinhard Schmidt, Daniel Geißler, Dorothea Lorenz, Jenny Eichhorst, Sandro Keller, Hiroshi Kaneko, Klaus Benndorf and Burkhard Wiesner

      Version of Record online: 4 NOV 2005 | DOI: 10.1002/anie.200502411

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      Shedding light: Efficient activation of cyclic nucleoside monophosphates (cNMPs) can be achieved upon one- and two-photon flash photolysis of novel photolabile coumarinylmethyl esters of cAMP and cGMP (A=adenosine, G=guanosine) as well as their 8-bromo-substituted derivatives. The phototriggers show high solubility in water and permit space- and time-resolved investigations of the molecular mechanisms of cyclic nucleotide dependent processes.

    13. Molecular Encoding at the Nanoscale: From Complex Cubes to Bimetallic Oxides (pages 7892–7896)

      Sebastian Polarz, Andrey V. Orlov, Maurits W. E. van den Berg and Matthias Driess

      Version of Record online: 21 NOV 2005 | DOI: 10.1002/anie.200501212

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      Simple metal acetates react to give bimetallic heterocubanes of the type [equation imageequation imageO4] (see structure, M1,2=Mn, Co, Ni, Zn), which in turn are precursors for the selective formation of bimetallic oxide nanoparticles with a controlled composition. The size of the particles can be controlled by adjusting the thermolysis temperature.

    14. Addressing the Metal Centers of [2×2] CoII4 Grid-Type Complexes by STM/STS (pages 7896–7900)

      Mohammad Sahabul Alam, Stefan Strömsdörfer, Viacheslav Dremov, Paul Müller, Jens Kortus, Mario Ruben and Jean-Marie Lehn

      Version of Record online: 28 NOV 2005 | DOI: 10.1002/anie.200502743

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      The controlled deposition of grid-type [2×2] CoII4 complexes onto graphite rendered free-standing 0D, 1D, and 2D molecular arrangements, which were examined by STM techniques. Scanning tunneling spectroscopy (STS) investigations enabled the direct addressing of the metal centers at the single-molecule level (see image). The experimentally determined intramolecular positions of the CoII centers are in agreement with DFT calculations of the molecule.

    15. The Photochemistry of o-Nitrobenzaldehyde as Seen by Femtosecond Vibrational Spectroscopy (pages 7901–7904)

      Stefan Laimgruber, Wolfgang J. Schreier, Tobias Schrader, Florian Koller, Wolfgang Zinth and Peter Gilch

      Version of Record online: 15 NOV 2005 | DOI: 10.1002/anie.200501642

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      A ketene comes and goes: The first intermediate in the photoredox reaction of o-nitrobenzaldehyde (1) is identified as ketene 2. In a femtosecond IR experiment a resonance at 2100 cm−1 corresponding to the ketene stretching vibration appears less than one picosecond after photoexcitation. The 90-ps decay of this band is a manifestation of a nucleophilic addition to the C[DOUBLE BOND]C double bond, which is supported by other spectroscopic experiments (IR and Raman).

    16. On the Chemistry of Gold in Silicate Glasses: Studies on a Nonthermally Activated Growth of Gold Nanoparticles (pages 7905–7909)

      Maik Eichelbaum, Klaus Rademann, Ralf Müller, Martin Radtke, Heinrich Riesemeier and Wolf Görner

      Version of Record online: 31 OCT 2005 | DOI: 10.1002/anie.200502174

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      Gold in glass: Activating gold silicate glasses with synchrotron X-rays results in the spatial reduction of cationic gold to gold atoms. Subsequent annealing allows the growth of nanoparticles with defined sizes and tailored optical properties (see picture). This opens up new vistas in functionalizing chemically and mechanically stable glasses for integrated nanophotonic applications.

    17. Mechanism-Based Design of a ROMP Catalyst for Sequence-Selective Copolymerization (pages 7909–7911)

      Marc Bornand and Peter Chen

      Version of Record online: 8 DEC 2005 | DOI: 10.1002/anie.200502606

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      Back and forth like a metronome is how the carbene moiety swings in a dual-site catalyst which produces a predominantly alternating copolymer of norbornene and cyclooctene from a one-pot reaction of appropriate mixtures of the two monomers (see scheme). The alternating sequence of the polymer was confirmed by NMR spectroscopy and gel-permeation gravimetric analysis.

    18. Corrosion-Based Synthesis of Single-Crystal Pd Nanoboxes and Nanocages and Their Surface Plasmon Properties (pages 7913–7917)

      Yujie Xiong, Benjamin Wiley, Jingyi Chen, Zhi-Yuan Li, Yadong Yin and Younan Xia

      Version of Record online: 22 NOV 2005 | DOI: 10.1002/anie.200502722

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      Inside out: Corrosive pitting and etching can be combined in a simple, elegant, and powerful method to transform single-crystal Pd nanocubes into nanoboxes (see SEM image) and nanocages in a one-pot synthesis without the involvement of exotic templates. Emptying the interiors enables the surface plasmon resonance peaks of the Pd nanostructures to be tuned from 410 to 520 nm.

    19. Total Synthesis of (+)-Rugulosin and (+)-2,2′-epi-Cytoskyrin A through Cascade Reactions (pages 7917–7921)

      K. C. Nicolaou, Yee Hwee Lim, Charles D. Papageorgiou and Jared L. Piper

      Version of Record online: 8 DEC 2005 | DOI: 10.1002/anie.200503678

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      The cytoskyrin cascade: The total syntheses of the bisanthraquinones 2 (+)-2,2′-epi-cytoskyrin A (R2=OMe) and (+)-rugulosin (R2=Me) has been achieved through a cascade sequence from anthradihydroquinone monomeric units 1.

    20. Exceptional Molecular Hyperpolarizabilities in Twisted π-Electron System Chromophores (pages 7922–7925)

      Hu Kang, Antonio Facchetti, Peiwang Zhu, Hua Jiang, Yu Yang, Elena Cariati, Stefania Righetto, Renato Ugo, Cristiano Zuccaccia, Alceo Macchioni, Charlotte L. Stern, Zhifu Liu, Seng-Tiong Ho and Tobin J. Marks

      Version of Record online: 21 NOV 2005 | DOI: 10.1002/anie.200501581

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      Nonlinear optics: Twisted π-electron system electrooptic (EO) chromophores with exceptional molecular hyperpolarizabilities (−488 000×10−48 esu at 1907 nm) were designed and synthesized. Crystallographic analysis reveals large twist angles and a highly charge-separated zwitterionic ground state. Experiments on poled host–guest polymers containing these chromophores show them to be promising candidates for EO applications.

    21. Indole-Based Macrocycles as a Class of Receptors for Anions (pages 7926–7929)

      Kyoung-Jin Chang, Dohyun Moon, Myoung Soo Lah and Kyu-Sung Jeong

      Version of Record online: 10 NOV 2005 | DOI: 10.1002/anie.200503121

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      Shift work: The identity of an anion complexed to indole-based macrocycles can be determined by the NMR chemical shift of the NH protons (see picture). The difference in the chemical shifts arises from a difference in the strength of the hydrogen-bonding interactions between the macrocycles and the anions.

    22. Characteristics of Boron Nitride Nanotube–Polyaniline Composites (pages 7929–7932)

      Chunyi Zhi, Yoshio Bando, Chengchun Tang, Susumu Honda, Kazuhiko Sato, Hiroaki Kuwahara and Dmitri Golberg

      Version of Record online: 15 NOV 2005 | DOI: 10.1002/anie.200502591

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      A self-organized film of boron nitride nanotube–polyaniline (BNNT–PANI) composite is fabricated by using a simple solution method. The BNNTs are fully coated with PANI as a result of strong interactions between these components (see picture). Mechanically tough, BNNTs may have potential as stabilizing additives to PANI or other polymers.

    23. Covalent Functionalization: Towards Soluble Multiwalled Boron Nitride Nanotubes (pages 7932–7935)

      Chunyi Zhi, Yoshio Bando, Chengchun Tang, Susumu Honda, Kazuhiko Sato, Hiroaki Kuwahara and Dmitri Golberg

      Version of Record online: 15 NOV 2005 | DOI: 10.1002/anie.200502846

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      Playing with the band: Long alkyl chains are bound to boron nitride nanotubes (BNNTs) from the reaction of stearoyl chloride with amino groups on the BNNTs; the resulting functionalized BNNTs (see picture) are soluble in many organic solvents. Cathodoluminescence and UV/Vis absorption experiments indicate that the long alkyl chains may induce drastic changes in the band structure of BNNTs.

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      Dynamic Combinatorial Libraries of Dye Complexes as Sensors (pages 7935–7938)

      Andrey Buryak and Kay Severin

      Version of Record online: 10 NOV 2005 | DOI: 10.1002/anie.200502827

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      A simple solution: Simply dissolving three commercially available dyes and two metal salts in a buffer is sufficient to create a sensor which allows the identification of dipeptides with high selectivity by using UV/Vis spectroscopy (see picture for the adaptive behaviour of a dynamic mixture of colored compounds A–H).

    25. Azine-Bridged Octanuclear Copper(II) Complexes Assembled with a One-Stranded Ditopic Thiocarbohydrazone Ligand (pages 7938–7942)

      Diana Dragancea, Vladimir B. Arion, Sergiu Shova, Eva Rentschler and Nicolae V. Gerbeleu

      Version of Record online: 15 NOV 2005 | DOI: 10.1002/anie.200501807

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      Metallomacrocyclic arrays containing eight copper(II) centers (see picture; green Cu, blue N, red O, yellow S) were obtained by using a heptadentate thiocarbohydrazone ligand with a particular conformational and configurational flexibility, as well as an appropriate arrangement of metal-binding sites, coordination ability, and acid–base properties.

    26. Interpenetrating Copper–Silver Cyanometallate Networks: Polymorphs and Topological Isomers (pages 7942–7946)

      Ann M. Chippindale, Simon M. Cheyne and Simon J. Hibble

      Version of Record online: 15 NOV 2005 | DOI: 10.1002/anie.200502372

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      Caught in the net: A series of mixed copper(I)–silver(i) cyanide complexes of the form A[Ag2Cu(CN)4] (A=K, Rb, Cs) have been found to form interpenetrating layer structures and three-dimensional networks (see picture). Two different forms of the Rb and Cs compounds are observed, which are both topological isomers and polymorphs.

    27. Mild and Chemoselective Peptide-Bond Cleavage of Peptides and Proteins at Azido Homoalanine (pages 7946–7950)

      Jaap Willem Back, Olivier David, Gertjan Kramer, Géraldine Masson, Piotr T. Kasper, Leo J. de Koning, Luitzen de Jong, Jan H. van Maarseveen and Chris G. de Koster

      Version of Record online: 10 NOV 2005 | DOI: 10.1002/anie.200502431

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      A gentle break: Cleavage of peptides containing the non-natural but proteogenic amino acid azido homoalanine can be accomplished by phosphine- or dithiol-mediated reductive activation of the azide functionality in aqueous buffers (see scheme). The resulting C-terminal lactone of one peptide fragment allows facile further derivatization.

    28. Synthetic Substrates for an Endoplasmic Reticulum Protein-Folding Sensor, UDP-Glucose: Glycoprotein Glucosyltransferase (pages 7950–7954)

      Kiichiro Totani, Yoshito Ihara, Ichiro Matsuo, Hiroyuki Koshino and Yukishige Ito

      Version of Record online: 11 NOV 2005 | DOI: 10.1002/anie.200502723

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      Quality control: UDP-glucose:glycoprotein glucosyltransferase (UGGT) works as the folding sensor in glycoprotein quality control. It glucosylates the Man9GlcNAc2 of misfolded glycoproteins to produce Glc1Man9GlcNAc2, which is a ligand of calnexin and calreticulin. The synthetic substrate Man9GlcNAc2-MTX can be used for the quantitative analysis of UGGT. UDP=uridine 5′-diphosphate, Glc=D-glucose, Man=D-mannose, GlcNAc=N-acetyl-D-glucosamine, MTX=methotrexate.

    29. Predictions, Synthetic Strategy, and Isolation of a Linear Tetrametallic Triple-Stranded Lanthanide Helicate (pages 7954–7958)

      Kornelia Zeckert, Josef Hamacek, Jean-Michel Senegas, Natalia Dalla-Favera, Sébastien Floquet, Gérald Bernardinelli and Claude Piguet

      Version of Record online: 17 NOV 2005 | DOI: 10.1002/anie.200503040

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      Complex twists: Following theoretical thermodynamic predictions, it is seen that the tetrametallic triple-stranded lanthanide helicate [Ln4L3]12+ (see structure) dominates the speciation in solution at millimolar concentrations, despite its high positive charge. Isolation of the europium complex in the solid state unambiguously establishes its nanometric triple-helical structure.

    30. The Autoionization of [TiF4] by Cation Complexation with [15]Crown-5 To Give [TiF2([15]crown-5)][Ti4F18] Containing the Tetrahedral [Ti4F18]2− Ion (pages 7958–7961)

      Andreas Decken, H. Donald B. Jenkins, Carsten Knapp, Grigory B. Nikiforov, Jack Passmore and J. Mikko Rautiainen

      Version of Record online: 22 NOV 2005 | DOI: 10.1002/anie.200502900

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      It's the crown that does it: The auto-ionization of [TiF4] has been promoted by complexation with [15]crown-5 to produce [TiF2([15]crown-5)][Ti4F18], which contains the new tetrahedral ion [Ti4F18]2− (see picture). The thermodynamics of the [Ti4F18]2− ion relative to the [Ti2F9] ion in the gas, solution, and solid states were calculated by density functional methods.

    31. Phenol Ugi–Smiles Systems: Strategies for the Multicomponent N-Arylation of Primary Amines with Isocyanides, Aldehydes, and Phenols (pages 7961–7964)

      Laurent El Kaïm, Laurence Grimaud and Julie Oble

      Version of Record online: 15 NOV 2005 | DOI: 10.1002/anie.200502636

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      A Smiles rearrangement is the key step in the efficient coupling of primary amines with isocyanides, carbonyl compounds, and electron-deficient substituted phenols to form N-aryl amines (see picture). The presence of a nitro or ester group on the resulting adduct allows applications in heterocyclic synthesis.

    32. Gelation of Helical Polypeptide–Random Coil Diblock Copolymers by a Nanoribbon Mechanism (pages 7964–7968)

      Kyoung Taek Kim, Chiyoung Park, Guido W. M. Vandermeulen, David A. Rider, Chulhee Kim, Mitchell A. Winnik and Ian Manners

      Version of Record online: 15 NOV 2005 | DOI: 10.1002/anie.200502809

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      Thermoreversible gelation of diblock copolymers of a helical polypeptide, poly(γ-benzyl-L-glutamate) and random-coil polymers such as polyferrocenylsilanes in dilute solution has been discovered (see picture). A new mechanism for self-assembly of block copolymers of helical polypeptides is proposed.

    33. Springlike Nanohelical Structures in Chiral Block Copolymers (pages 7969–7972)

      Yeo-Wan Chiang, Rong-Ming Ho, Bao-Tsan Ko and Chu-Chien Lin

      Version of Record online: 10 NOV 2005 | DOI: 10.1002/anie.200502236

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      Spring-loaded polymers: The nanohelical structure of poly(L-lactide) (PLLA) in the polystyrene (PS) matrix of chiral PS-PLLA block copolymers displays springlike behavior in response to an applied stimulus. The self-assembled nanohelices are transformed into cylinders by crystallization or shearing (see picture). This thermally reversible phase behavior may be used for manipulating switchable nanohelical structures.

    34. Controlled Autocatalytic Nitration of Phenol in a Microreactor (pages 7972–7975)

      Laurent Ducry and Dominique M. Roberge

      Version of Record online: 10 NOV 2005 | DOI: 10.1002/anie.200502387

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      Scaled-down approach: The nitration of phenol is an autocatalytic, strongly exothermic reaction and is thus difficult to handle on an industrial scale. Continuous nitration in a microreactor (see picture) affords higher yields and enhanced process safety, thanks to good heat exchange and mixing properties, as well as rapid radical propagation under sufficiently harsh conditions.

    35. Phase-Transfer-Catalyzed Asymmetric Aza-Henry Reaction Using N-Carbamoyl Imines Generated In Situ from α-Amido Sulfones (pages 7975–7978)

      Francesco Fini, Valentina Sgarzani, Daniel Pettersen, Raquel P. Herrera, Luca Bernardi and Alfredo Ricci

      Version of Record online: 15 NOV 2005 | DOI: 10.1002/anie.200502646

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      A general approach to the catalytic asymmetric aza-Henry reaction has been developed. The combination of a commercially available phase-transfer catalyst (PTC) with a base is able to promote the in situ formation of N-carbamoyl imines from α-amido sulfones and activate nitromethane towards the asymmetric addition reaction, thus furnishing N-carbamoyl-protected β-nitroamines in good yields and with up to 98 % ee (see scheme; PG=protecting group).

    36. Quasi-Homogeneous Methanol Synthesis Over Highly Active Copper Nanoparticles (pages 7978–7981)

      Sascha Vukojević, Oliver Trapp, Jan-Dierk Grunwaldt, Christoph Kiener and Ferdi Schüth

      Version of Record online: 22 NOV 2005 | DOI: 10.1002/anie.200503169

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      Aluminum-stabilized copper colloids with a size of about 5 nm (see picture) are the key to a quasi-homogeneous version of the heterogeneously catalyzed synthesis of methanol from synthesis gas over Cu/ZnO/Al2O3. The catalyst productivity is very high in spite of the absence of ZnO.

    37. Total Synthesis of (−)-Samaderine Y from (S)-(+)-Carvone (pages 7981–7984)

      Tony K. M. Shing and Ying Y. Yeung

      Version of Record online: 10 NOV 2005 | DOI: 10.1002/anie.200502763

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      Elegant, efficient, and enantiospecific describe the first total synthesis of the quassinoid (−)-samaderine Y (see scheme), which has been shown to display in vitro cytotoxicity and is of interest as a potential antitumor agent. Its synthesis has been accomplished from (S)-(+)-carvone in 21 steps.

    38. High-Temperature Synthesis of the Surprisingly Stable C1-C70(CF3)10 Isomer with a para7metapara Ribbon of Nine C6(CF3)2 Edge-Sharing Hexagons (pages 7984–7987)

      Ivan E. Kareev, Igor V. Kuvychko, Alexey A. Popov, Sergey F. Lebedkin, Susie M. Miller, Oren P. Anderson, Steven H. Strauss and Olga V. Boltalina

      Version of Record online: 15 NOV 2005 | DOI: 10.1002/anie.200502419

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      From the equator to the pole: The high-temperature, high-yield C1 isomer of C70(CF3)10 has an unprecedented structure. The CF3 groups belong to a para7metapara ribbon of edge-sharing C6(CF3)2 hexagons, which wraps around the equator of the C70 cage and then climbs up to one of the poles. Calculations demonstrate that this isomer is more stable than the structures observed for C70Br10 and C70(tBuOO)10.

    39. An Unexpected Photoelectronic Effect from [Co(en)3]2(Zr2F12)(SiF6)⋅4 H2O, a Compound Containing an H-Bonded Assembly of Discrete [Co(en)3]3+, (Zr2F12)4−, and (SiF6)2− Ions (pages 7988–7990)

      Yu Du, Min Yang, Jihong Yu, Qinhe Pan and Ruren Xu

      Version of Record online: 15 NOV 2005 | DOI: 10.1002/anie.200502514

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      Hydrogen-bonded network: A hydrothermal synthesis delivers the titled compound, which consists of an H-bonded network of discrete [Co(en)3]3+, (Zr2F12)4−, and (SiF6)2− ions. It exhibits an unexpected photoelectronic effect in the near-UV region (see figure).

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