Angewandte Chemie International Edition

Cover image for Vol. 47 Issue 3

January 4, 2008

Volume 47, Issue 3

Pages 419–611

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Book Review
    7. Highlights
    8. Review
    9. Communications
    10. Preview
    1. Cover Picture: Mesostructured Prussian Blue Analogues (Angew. Chem. Int. Ed. 3/2008) (page 419)

      Xavier Roy, Laurence K. Thompson, Neil Coombs and Mark J. MacLachlan

      Article first published online: 21 DEC 2007 | DOI: 10.1002/anie.200790263

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      Mesostructured Prussian blue analogues have been prepared by ligand-assisted templating in formamide. These materials, reported by M. MacLachlan et al. on page 511 ff., contain cyanide-linked metal centers organized around an alkyl pyrazinium template with lamellar, hexagonal, or cubic periodicity. The cover picture shows a synthesis of these compounds against a background painting dating from the early 1800s showing two chemists making Prussian blue, the oldest-known coordination complex. (Graphic by Elizabeth Varty; background image courtesy of Wisconsin Academy of Sciences, Arts and Letters.)

  2. Inside Cover

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Book Review
    7. Highlights
    8. Review
    9. Communications
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    1. Inside Cover: Ionothermal Synthesis of Oriented Zeolite AEL Films and Their Application as Corrosion-Resistant Coatings (Angew. Chem. Int. Ed. 3/2008) (page 420)

      Rui Cai, Minwei Sun, Zhongwei Chen, Ronnie Munoz, Cory O'Neill, Derek E. Beving and Yushan Yan

      Article first published online: 21 DEC 2007 | DOI: 10.1002/anie.200790264

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      Zeolite coatings present a safe and viable alternative to the commonly used but toxic chromate conversion coating for aluminum alloys and other metals, but they normally require high-pressure synthesis. In the Communication on page 525 ff., Y. S. Yan and co-workers present the first ionothermal method by which an oriented zeolite coating can be synthesized on Al alloy at ambient pressure by using microwave radiation. This coating, when sealed with silane, shows exceptional corrosion resistance.

  3. Graphical Abstract

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

    1. Top of page
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    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Book Review
    7. Highlights
    8. Review
    9. Communications
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  5. Book Review

    1. Top of page
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    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Book Review
    7. Highlights
    8. Review
    9. Communications
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  6. Highlights

    1. Top of page
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    4. Graphical Abstract
    5. News
    6. Book Review
    7. Highlights
    8. Review
    9. Communications
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    1. Ionic Liquids and Microwaves—Making Zeolites for Emerging Applications (pages 442–444)

      Russell E. Morris

      Article first published online: 11 DEC 2007 | DOI: 10.1002/anie.200704888

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      Not much pressure: Taking advantage of the low volatility of ionic liquids, together with their excellent absorption of microwave radiation, highly oriented coatings of zeolites on metals have been prepared at ambient pressure (see picture; O red, Al blue, P yellow, T=Al, P), thus circumventing the usual high pressures associated with zeolite synthesis. This technique offers a simplified synthesis that may be used in many other applications of zeolites.

    2. The Next Generation of Shape-Persistant Zeolite Analogues: Covalent Organic Frameworks (pages 445–447)

      Michael Mastalerz

      Article first published online: 4 DEC 2007 | DOI: 10.1002/anie.200703871

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      Porous and highly ordered: After metal–organic frameworks (MOFs), which were first described over ten years ago, a new class of porous materials has been introduced: covalent organic frameworks (COFs), which are distinguished by high thermostabilities, large specific surface areas, and low densities. The example shows a model structure of COF-108.

    3. Hole Control in Microporous Polymers (pages 448–450)

      Christoph Weder

      Article first published online: 3 DEC 2007 | DOI: 10.1002/anie.200704697

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      Amorphous, but defined: The control of pore size in microporous polymers represents an important problem that is relevant to many applications. Several approaches have recently emerged to solve this problem. Highlighted here is a new study which shows that control over pore size can be achieved in amorphous conjugated polymer networks.

  7. Review

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    6. Book Review
    7. Highlights
    8. Review
    9. Communications
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    1. The Larger Acenes: Versatile Organic Semiconductors (pages 452–483)

      John E. Anthony

      Article first published online: 28 NOV 2007 | DOI: 10.1002/anie.200604045

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      Making acene: Semiconducting acenes are well suited for numerous organic electronic components, and their functionalization allows improvements in stability, solubility, and compatibility. Most importantly, however, the lifetime of the electronic components must be improved. Derivatives of acenes larger than pentacene have recently become available.

  8. Communications

    1. Top of page
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    4. Graphical Abstract
    5. News
    6. Book Review
    7. Highlights
    8. Review
    9. Communications
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    1. From Storable Sources of Atomic Nb and Ta Ions to Isolable Anionic Tris(1,3-butadiene)metal Complexes: [M(η4-C4H6)3], M=Nb, Ta (pages 484–489)

      Victor J. Sussman and John E. Ellis

      Article first published online: 11 DEC 2007 | DOI: 10.1002/anie.200703887

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      Hat trick: Homoleptic butadienemetalates of 4d and 5d metals have for the first time been structurally characterized. The niobium–naphthalene species [Nb(η4-C10H8)2(PMe3)2] functions as a useful source of “naked” Nb ions in its reaction with 1,3-butadiene to afford an unprecedented homoleptic niobium–butadiene complex [Nb(η4-C4H6)3] (see structure). The tantalum analogue [Ta(η4-C4H6)3] was obtained by a similar route.

    2. Single-Molecule Magnets with Mesomorphic Lamellar Ordering (pages 490–495)

      Emmanuel Terazzi, Cyril Bourgogne, Richard Welter, Jean-Louis Gallani, Daniel Guillon, Guillaume Rogez and Bertrand Donnio

      Article first published online: 28 NOV 2007 | DOI: 10.1002/anie.200704460

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      Layering up: The single-molecule magnets (SMMs) [Mn12O12(O2CR)16(H2O)4] have been shown to exhibit liquid-crystalline phases. The mesophases can be smectic or cubic depending on the surface functionality imparted by the R group. A local squarelike arrangement of the cluster cores is observed within the smectic layers. This result is a first step towards the self-assembly of SMMs on surfaces by a bottom-up approach.

    3. Achiral Nucleobase Cytosine Acts as an Origin of Homochirality of Biomolecules in Conjunction with Asymmetric Autocatalysis (pages 496–499)

      Tsuneomi Kawasaki, Kenta Suzuki, Yuko Hakoda and Kenso Soai

      Article first published online: 3 DEC 2007 | DOI: 10.1002/anie.200703634

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      Crystals to add chirality: Cytosine, a prebiotic achiral biomolecule and an essential nucleobase, spontaneously forms enantioenriched crystals if stirring is applied during crystallization. The chiral crystal of achiral cytosine is a chiral initiator for asymmetric autocatalysis of a pyrimidyl alkanol with amplification of the ee value, which provides a nearly enantiopure alcohol with an absolute configuration correlated to that of the cytosine crystal.

    4. A Tunable FRET Circuit for Engineering Fluorescent Biosensors (pages 500–502)

      Michael D. Allen and Jin Zhang

      Article first published online: 4 DEC 2007 | DOI: 10.1002/anie.200703493

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      Donor, acceptor, and tuner: FRET-based ratiometric live-cell imaging captures emissions of two fluorophores within the constraints of a FRET pair. A method for engineering FRET-circuit-based biosensors has been developed by introducing an intermediate fluorophore, which facilitates energy transfer and allows tuning of the circuit efficiency. A protein kinase A biosensor was thus generated with a larger dynamic range than its precursors.

    5. Observation of Three Intervalence-Transfer Bands for a Class II–III Mixed-Valence Complex of Ruthenium (pages 503–506)

      Reginaldo C. Rocha, Francisca N. Rein, Hershel Jude, Andrew P. Shreve, Javier J. Concepcion and Thomas J. Meyer

      Article first published online: 3 DEC 2007 | DOI: 10.1002/anie.200702760

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      Multiple intervalence-transfer (IT) absorptions (see picture) appear in the near-IR/IR spectra of the mixed-valence complex [Cl3RuII(tppz)RuIIICl3] (tppz=tetrakis(2-pyridyl)pyrazine), whose X-ray crystal structure and electronic and vibrational spectroscopic features indicate localized-to-delocalized (Class II–III) behavior.

    6. Experimental Evidence That a DNA Polymerase Can Incorporate N7-Platinated Guanines To Give Platinated DNA (pages 507–510)

      Michele Benedetti, Cosimo Ducani, Danilo Migoni, Daniela Antonucci, Vita M. Vecchio, Antonella Ciccarese, Alessandro Romano, Tiziano Verri, Giuseppe Ciccarella and Francesco P. Fanizzi

      Article first published online: 3 DEC 2007 | DOI: 10.1002/anie.200703160

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      Metal bearing nucleobase: A model DNA polymerase and N7-metalated purine triphosphate nucleotide are used to show that metalated purines can be inserted into DNA during an enzymatic in vitro synthetic process (see scheme; dNTP=deoxynucleotide triphosphate). The possibility of site-specific metalation of DNA mediated by DNA polymerase is demonstrated.

    7. Mesostructured Prussian Blue Analogues (pages 511–514)

      Xavier Roy, Laurence K. Thompson, Neil Coombs and Mark J. MacLachlan

      Article first published online: 7 NOV 2007 | DOI: 10.1002/anie.200703627

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      Holey Prussian blue, Batman! A family of mesostructured Prussian blue analogues has been developed by a ligand-assisted templating approach in formamide. These new materials are composed of cyanide-linked metal centers organized around alkyl pyrazinium templates with lamellar, hexagonal (see idealized structural model), or cubic periodicity. Evidence for valence delocalization and magnetic interactions in materials formed from FeII/FeIII is presented.

    8. Encapsulation of Fullerenes in a Helical PMMA Cavity Leading to a Robust Processable Complex with a Macromolecular Helicity Memory (pages 515–519)

      Takehiro Kawauchi, Jiro Kumaki, Atsushi Kitaura, Kento Okoshi, Hiroshi Kusanagi, Keita Kobayashi, Toshiki Sugai, Hisanori Shinohara and Eiji Yashima

      Article first published online: 30 NOV 2007 | DOI: 10.1002/anie.200703655

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      A commodity plastic, syndiotactic poly(methyl methacrylate) (st-PMMA), has been found to fold into a right- or left-handed helix through the assistance of (R)- or (S)-1-phenylethanol (1) and encapsulates fullerenes within its helical cavity to form a robust, processable, and optically active peapod-like complex whose helicity is retained after removal of the chiral alcohols.

    9. Theoretical Model for Nanoporous Carbon Supercapacitors (pages 520–524)

      Jingsong Huang, Bobby G. Sumpter and Vincent Meunier

      Article first published online: 4 DEC 2007 | DOI: 10.1002/anie.200703864

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      Importance of pore curvature: A theoretical model is proposed for nanoporous carbon supercapacitors to replace the commonly used one for an electric double-layer capacitor (EDLC) on the basis of an electric double-cylinder capacitor (EDCC) for mesopores, which becomes an electric wire-in-cylinder capacitor (EWCC) for micropores (see picture; left to right: decreasing pore size). This model explains the experimental data in various pore ranges, showing the significance of pore curvature.

    10. Ionothermal Synthesis of Oriented Zeolite AEL Films and Their Application as Corrosion-Resistant Coatings (pages 525–528)

      Rui Cai, Minwei Sun, Zhongwei Chen, Ronnie Munoz, Cory O'Neill, Derek E. Beving and Yushan Yan

      Article first published online: 31 OCT 2007 | DOI: 10.1002/anie.200704003

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      Does this coat your airplane? Zeolite coatings on aluminum alloys and other metals are a safe alternative to the commonly used, toxic chromate conversion coating. However, zeolite coatings are usually synthesized in aqueous medium under high pressure. Using an ionothermal method, an oriented SAPO-11 coating on an Al alloy was prepared at ambient pressure using microwave radiation. This coating shows exceptional corrosion resistance.

    11. High-Pressure Polymorphism as a Step towards Destabilization of LiBH4 (pages 529–532)

      Yaroslav Filinchuk, Dmitry Chernyshov, Andriy Nevidomskyy and Vladimir Dmitriev

      Article first published online: 3 DEC 2007 | DOI: 10.1002/anie.200704777

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      Performing under pressure: The BH4 group in the high-pressure modification of LiBH4 has an unprecedented square-planar coordination by four Li atoms (see picture). This structure exhibits a strikingly short H⋅⋅⋅H contact between adjacent BH4 anions and thus may show completely different hydrogen-storage properties if stabilized by chemical substitution at ambient pressure.

    12. Novel Reactivity of Side-On (Disulfido)dicopper Complexes Supported by Bi- and Tridentate Nitrogen Donors: Impact of Axial Coordination (pages 533–536)

      Itsik Bar-Nahum, John T. York, Victor G. Young Jr. and William B. Tolman

      Article first published online: 3 DEC 2007 | DOI: 10.1002/anie.200704690

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      What a difference a ligand makes: A comparison of the reactivity of the two complexes shown (Cu green, S yellow, N blue, O red, F pink, C gray) has revealed new redox processes previously unseen for copper–sulfur complexes. Furthermore, intriguing supporting-ligand effects on the properties of (disulfido)dicopper cores are uncovered.

    13. Are Environmentally Coupled Enzymatic Hydrogen Tunneling Reactions Influenced by Changes in Solution Viscosity? (pages 537–540)

      Sam Hay, Christopher R. Pudney, Michael J. Sutcliffe and Nigel S. Scrutton

      Article first published online: 30 NOV 2007 | DOI: 10.1002/anie.200704484

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      Light at the end of the tunnel? The rate and kinetic isotope effect of an enzymatic H-tunneling reaction are not dependent on solution viscosity (see picture), despite clear evidence that this reaction is coupled to promoting motions within the protein. This finding is in contrast to the viscosity dependence of conformationally gated electron-transfer reactions and suggests that the mechanisms of environmental gating of these reactions are different.

    14. Synthesis, Characterization, and Catalytic Activity of a Well-Defined Rhodium Siloxide Complex Immobilized on Silica (pages 541–544)

      Bogdan Marciniec, Karol Szubert, Marek J. Potrzebowski, Ireneusz Kownacki and Kinga Łȩszczak

      Article first published online: 4 DEC 2007 | DOI: 10.1002/anie.200704362

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      Rhodium siloxide surface complex 2, which was obtained directly by reaction of molecular precursor 1 with aerosil silica and characterized inter alia by solid-state NMR spectroscopy, is a highly active and stable catalyst for hydrosilylation reactions.

    15. Highly Efficient Catalytic System for Enantioselective Michael Addition of Aldehydes to Nitroalkenes in Water (pages 545–548)

      Shaolin Zhu, Shouyun Yu and Dawei Ma

      Article first published online: 23 NOV 2007 | DOI: 10.1002/anie.200704161

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      Organocatalysis: A highly effective catalytic procedure for the Michael addition of aldehydes to nitroalkenes is achieved by combining the excellent asymmetric induction ability of o-TMS-protected diphenylprolinol compounds, the quick formation of enamines in the presence of benzoic acid, and the highly concentrated organic phase in water (see scheme; TMS=trimethylsilyl).

    16. A Crown Ether as Template for Microporous and Nanostructured Uranium Compounds (pages 549–551)

      Evgeny V. Alekseev, Sergey V. Krivovichev and Wulf Depmeier

      Article first published online: 3 DEC 2007 | DOI: 10.1002/anie.200703295

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      Highly porous uranyl compounds in which SO42− or SeO42− ions link adjacent U centers were prepared by using a crown ether as template. The uranyl sulfate (see picture; U- and S-centered polyhedra are yellow and green, respectively) has the lowest density so far reported for actinide oxide frameworks, while the uranyl selenate forms tubules that are separated by columns of [(H3O)@([18]crown-6)]+ complex cations.

    17. Layered Silicates by Swelling of AMH-3 and Nanocomposite Membranes (pages 552–555)

      Sunho Choi, Joaquin Coronas, Edgar Jordan, Weontae Oh, Sankar Nair, Frank Onorato, Daniel F. Shantz and Michael Tsapatsis

      Article first published online: 26 NOV 2007 | DOI: 10.1002/anie.200703440

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      Filling in: A new layered silicate material is prepared from a 3D porous silicate framework (AMH-3) by a novel procedure involving ion exchange and sequential intercalation. Layers of swollen AMH-3 are incorporated into a polymer, resulting in a mixed-matrix nanocomposite (see picture). The room-temperature hydrogen/carbon dioxide ideal selectivity of the swollen nanocomposite membranes is improved by a factor of two compared to the pure polymer.

    18. Synthesis and Characterization of the Gold(I) Tris(ethylene) Complex [Au(C2H4)3][SbF6] (pages 556–559)

      H. V. Rasika Dias, Mauro Fianchini, Thomas R. Cundari and Charles F. Campana

      Article first published online: 3 DEC 2007 | DOI: 10.1002/anie.200703515

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      Ethylene el dorado: Gold(I) unusually takes up three ethylene molecules in a spoked-wheel arrangement (see picture). The complex was synthesized as the hexafluoroantimonate salt and structurally characterized.

    19. Aluminum Triflate as a Highly Active and Efficient Nonprotic Cocatalyst in the Palladium-Catalyzed Methoxycarbonylation Reaction (pages 560–563)

      D. Bradley G. Williams, Megan L. Shaw, Michael J. Green and Cedric W. Holzapfel

      Article first published online: 28 NOV 2007 | DOI: 10.1002/anie.200702889

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      Lewis does it better: Aluminum triflate readily replaces Brønsted acid cocatalysts in the palladium-catalyzed methoxycarbonylation reaction of styrene and 1-pentene, producing catalysts that are stable and more active than those using traditional acids. Catalyst loadings of 0.02 % allow conversions of up to 100 % to be achieved within three hours with no loss of linear/branched ester selectivity.

    20. Cobaloxime-Based Photocatalytic Devices for Hydrogen Production (pages 564–567)

      Aziz Fihri, Vincent Artero, Mathieu Razavet, Carole Baffert, Winfried Leibl and Marc Fontecave

      Article first published online: 19 DEC 2007 | DOI: 10.1002/anie.200702953

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      It is the dawning of the age of supramolecular photocatalysts for H2 production using first-row transition-metal catalytic centers. These catalysts consist of a ruthenium tris(diimine) light-harvesting unit covalently linked to various catalytic cobaloxime centers (see picture). The catalyst stability, CoII/CoI redox potential, and nucleophilicity of the cobaloxime moiety all affect the photocatalytic properties.

    21. Asymmetric Allenophanes: Synthesis of a Tris-meta-allenophane and Tetrakis-meta-allenophane by Sequential Cross-Coupling (pages 568–572)

      Mathieu Leclère and Alex G. Fallis

      Article first published online: 21 NOV 2007 | DOI: 10.1002/anie.200703003

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      Around and around: A strategy based on sequential Pd-catalyzed cross-coupling reactions was applied for the asymmetric synthesis of new macrocyclic meta-allenophanes composed of 18- or 24-membered rings (see structures). The chiral components, tertiary propargyl alcohols and allene bridges, were assembled by a general enantioselective protocol, which involved a Sharpless epoxidation, an oxidation, and Sonogashira cross-coupling.

    22. Alkylzinc Carboxylates as Efficient Precursors for Zinc Oxocarboxylates and Sulfidocarboxylates (pages 573–576)

      Janusz Lewiński, Wojciech Bury, Michał Dutkiewicz, Michał Maurin, Iwona Justyniak and Janusz Lipkowski

      Article first published online: 22 NOV 2007 | DOI: 10.1002/anie.200703125

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      Zinc clusters: The first simple alkylzinc carboxylate provides insights into the previously unexplored oxygenation and sulfuration of alkylzinc complexes supported by carboxylate ligands (see picture).

    23. Efficient Photoswitching of the Nonlinear Optical Properties of Dipolar Photochromic Zinc(II) Complexes (pages 577–580)

      Vincent Aubert, Véronique Guerchais, Eléna Ishow, Khuyen Hoang-Thi, Isabelle Ledoux, Keitaro Nakatani and Hubert Le Bozec

      Article first published online: 3 DEC 2007 | DOI: 10.1002/anie.200704138

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      Flipping the switch: A new type of bipyridine-based ligand functionalized by phenyl- and dimethylaminophenyldithienylethene groups allows the preparation of photochromic dipolar zinc(II) complexes. For the first time, efficient on/off photoswitching of the NLO response of metallochromophores is observed.

    24. Benzimidazole/Amine-Based Compounds Capable of Ambipolar Transport for Application in Single-Layer Blue-Emitting OLEDs and as Hosts for Phosphorescent Emitters (pages 581–585)

      Mei-Yi Lai, Chih-Hsin Chen, Wei-Sheng Huang, Jiann T. Lin, Tung-Huei Ke, Li-Yin Chen, Ming-Han Tsai and Chung-Chih Wu

      Article first published online: 3 DEC 2007 | DOI: 10.1002/anie.200704113

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      A bolt from the blue? Compounds like that shown containing benzimidazole and arylamine units exhibit intriguing ambipolar carrier-transport properties and can be used to fabricate single-layer blue-emitting electroluminescent devices with very promising performances (see picture, ITO=indium tin oxide).

    25. Iron-Catalyzed C[BOND]O Cross-Couplings of Phenols with Aryl Iodides (pages 586–588)

      Olivia Bistri, Arkaitz Correa and Carsten Bolm

      Article first published online: 3 DEC 2007 | DOI: 10.1002/anie.200704018

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      Low-price coupling: A versatile, practical, and cost-efficient iron-catalyzed O-arylation protocol is applied to the synthesis of a variety of diaryl ethers, which are formed in high yields. Best results were obtained by using FeCl3 and a β-diketo ligand.

    26. Reductive Coupling of Acetonitrile by Uranium and Thorium Hydride Complexes To Give Cyanopentadienyl Dianion (C6N3H7)2− (pages 589–592)

      William J. Evans, Kevin A. Miller and Joseph W. Ziller

      Article first published online: 3 DEC 2007 | DOI: 10.1002/anie.200703969

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      The actinide metallocene hydrides [{(C5Me5)2UH}2] and [{(C5Me5)2ThH2}2] convert three equivalents of acetonitrile into a polydentate ligand containing a six carbon atom chain (see scheme). These reactions show that a ThIV hydride moiety can undergo chemistry similar to UIII in a multistep reaction.

    27. Asymmetric Brønsted Acid Catalysis: Enantioselective Nucleophilic Substitutions and 1,4-Additions (pages 593–596)

      Magnus Rueping, Boris J. Nachtsheim, Stefan A. Moreth and Michael Bolte

      Article first published online: 19 DEC 2007 | DOI: 10.1002/anie.200703668

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      Executive decision: Depending on the catalyst (both N-triflylphosphoramides), the highly enantioselective Brønsted acid catalyzed addition of indoles to α,β-unsaturated carbonyl compounds provides either α-keto esters (up to 92 % ee, left side of the scheme), or a novel type of bisindole (right), which displays atropisomerism. The α-keto esters can also be converted into amino acids by a one-pot 1,4-addition-reductive amination reaction.

    28. The Total Synthesis of Chlorotonil A (pages 597–599)

      Nicola Rahn and Markus Kalesse

      Article first published online: 28 NOV 2007 | DOI: 10.1002/anie.200703930

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      Stacking the deck: The natural product chloronitril A contains an unprecedented motif in which a CCl2 unit in a 14-membered macrolide framework is flanked by two carbonyl groups. In the first total synthesis of chlorotonil A a highly selective intramolecular Diels–Alder reaction was employed to generate the decalin system.

    29. Chlorotonil A, a Macrolide with a Unique gem-Dichloro-1,3-dione Functionality from Sorangium cellulosum, So ce1525 (pages 600–602)

      Klaus Gerth, Heinrich Steinmetz, Gerhard Höfle and Rolf Jansen

      Article first published online: 3 DEC 2007 | DOI: 10.1002/anie.200703993

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      Previously unknown: gem-Dichloro-1,3-diones were unprecedented as natural compounds, but chlorotonil A (1) features this functionality in a 14-membered lactone ring. Compound 1 was isolated from the myxobacterium Sorangium cellulosum and its structure elucidated. The poor solubility of 1 in both organic solvents and water again raises the old question of why bacteria create such complex metabolites.

    30. Tetrazarsoles—A New Class of Binary Arsenic–Nitrogen Heterocycles (pages 603–606)

      Axel Schulz and Alexander Villinger

      Article first published online: 3 DEC 2007 | DOI: 10.1002/anie.200704367

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      Group 15 galore: A new five-membered ring containing only nitrogen and arsenic was synthesized by a GaCl3-assisted [3+2] cycloaddition. The novel tetrazarsole was stabilized as the GaCl3 adduct (see structure; Cl green, Ga purple, N blue, As red, C gray).

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      Article first published online: 21 DEC 2007 | DOI: 10.1002/anie.200790267

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