Chemistry - A European Journal

Cover image for Vol. 17 Issue 17

April 18, 2011

Volume 17, Issue 17

Pages 4661–4927

  1. Cover Picture

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Review
    7. Communications
    8. Full Papers
    9. Preview
    1. Cover Picture: High-Spin Cyclopentadienyl Complexes: A Single-Molecule Magnet Based on the Aryl-Iron(II) Cyclopentadienyl Type (Chem. Eur. J. 17/2011) (page 4661)

      Daniel Weismann, Dr. Yu Sun, Dr. Yanhua Lan, Gotthelf Wolmershäuser, Prof. Dr. Annie K. Powell and Prof. Dr. Helmut Sitzmann

      Version of Record online: 8 APR 2011 | DOI: 10.1002/chem.201190082

      Thumbnail image of graphical abstract

      A mononuclear high-spin iron(II) complex coordinated by a pentaisopropylcyclopentadienide and an aryl group has been prepared and characterized by X-ray diffraction analysis. In their Communication on page 4700 ff., Y. Lan, H. Sitzmann et al. present AC magnetic studies in which this complex shows slow magnetic relaxation and exhibits the characteristics of a single-molecule magnet.

  2. Inside Cover

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Review
    7. Communications
    8. Full Papers
    9. Preview
    1. Inside Cover: Synthesis of Primary Amines from Secondary and Tertiary Amines: Ruthenium-Catalyzed Amination Using Ammonia (Chem. Eur. J. 17/2011) (page 4662)

      Sebastian Bähn, Sebastian Imm, Lorenz Neubert, Prof. Dr. Min Zhang, Dr. Helfried Neumann and Prof. Dr. Matthias Beller

      Version of Record online: 8 APR 2011 | DOI: 10.1002/chem.201190083

      Thumbnail image of graphical abstract

      A striking reaction occurs during the splitting of secondary and tertiary amines with ammonia and the Shvo catalyst—primary amines are obtained in up to 84 % yield. More details of these fascinating reactions are discussed in the Communication by M. Beller et al. on page 4705 ff.

  3. Graphical Abstract

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

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

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Review
    7. Communications
    8. Full Papers
    9. Preview
    1. Homogeneous Catalysis

      Bioinspired Catalyst Design and Artificial Metalloenzymes (pages 4680–4698)

      Peter J. Deuss, Dr. René den Heeten, Dr. Wouter Laan and Prof. Dr. Paul C. J. Kamer

      Version of Record online: 23 MAR 2011 | DOI: 10.1002/chem.201003646

      Thumbnail image of graphical abstract

      Inspired by Nature: Enzymes are exceptional catalysts in many ways, but their limited reaction repertoire restricts their application in synthesis routes performed in industry and research laboratories. Nature has inspired researchers to create new classes of transition-metal catalyst for important chemical conversions. This review highlights the development of catalysts based on natural building blocks and how these systems offer the prospect of new “enzyme-like” catalysts.

  6. Communications

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Review
    7. Communications
    8. Full Papers
    9. Preview
    1. Single-Molecule Magnets

      High-Spin Cyclopentadienyl Complexes: A Single-Molecule Magnet Based on the Aryl-Iron(II) Cyclopentadienyl Type (pages 4700–4704)

      Daniel Weismann, Dr. Yu Sun, Dr. Yanhua Lan, Gotthelf Wolmershäuser, Prof. Dr. Annie K. Powell and Prof. Dr. Helmut Sitzmann

      Version of Record online: 21 MAR 2011 | DOI: 10.1002/chem.201003288

      Thumbnail image of graphical abstract

      The mononuclear high-spin iron(II) complex 1, coordinated by a pentaisopropylcyclopentadienide and an aryl group (see graphic), has been prepared and characterized by X-ray diffraction analysis. AC magnetic studies have revealed that this species exhibits slow magnetic relaxation and has the characteristics of a single-molecule magnet.

    2. Synthetic Methods

      Synthesis of Primary Amines from Secondary and Tertiary Amines: Ruthenium-Catalyzed Amination Using Ammonia (pages 4705–4708)

      Sebastian Bähn, Sebastian Imm, Lorenz Neubert, Prof. Dr. Min Zhang, Dr. Helfried Neumann and Prof. Dr. Matthias Beller

      Version of Record online: 4 APR 2011 | DOI: 10.1002/chem.201100007

      Thumbnail image of graphical abstract

      Splitting of secondary and tertiary amines! The first selective catalytic synthesis of primary amines from secondary and tertiary amines with ammonia is reported. The products are obtained in yields up to 84 %.

    3. Tandem Radical Cyclizations

      Iron–Ligand Coordination in Tandem Radical Cyclizations: Synthesis of Benzo[b]thiophenes by a One-pot Reaction of Iron 1,3-Diketone Complexes with 2-Thiosalicylic Acids (pages 4709–4714)

      Dr. Sharon Lai-Fung Chan, Dr. Kam-Hung Low, Chen Yang, Samantha Hui-Fung Cheung and Prof. Chi-Ming Che

      Version of Record online: 23 MAR 2011 | DOI: 10.1002/chem.201100377

      Thumbnail image of graphical abstract

      Iron—the mediator: 1,3-Diketone ligands coordinated to iron undergo unprecedented tandem reactions with 2-thiosalicylic acids to give 2-substituted 3-hydroxylbenzo[b]thiophenes in up to 98 % yield. A similar reaction with 2-mercaptonicotinic acid gave a thieno[2,3-b]pyridine derivative in 72 % yield (see scheme). A mechanism involving redox transformation and tandem radical cyclization of the coordinated ligands is proposed.

    4. Reaction Mechanisms

      The Perchlorinated Silanes Si2Cl6 and Si3Cl8 as Sources of SiCl2 (pages 4715–4719)

      Dipl.-Chem. Frank Meyer-Wegner, Dipl.-Chem. Andor Nadj, Dr. Michael Bolte, Prof. Dr. Norbert Auner, Prof. Dr. Matthias Wagner, Prof. Dr. Max C. Holthausen and Dr. Hans-Wolfram Lerner

      Version of Record online: 21 MAR 2011 | DOI: 10.1002/chem.201003654

      Thumbnail image of graphical abstract

      Trapped in action: The amine-induced disproportionation of Si2Cl6 or Si3Cl8 to neo-Si5Cl12 and SiCl4 involves a SiCl2–base adduct as a key intermediate (see scheme). Direct evidence from low-temperature 1H/29Si HETCOR NMR and trapping experiments with dimethylbutadiene together with detailed mechanistic information derived from theory provide a clear view on the principles of this intriguing reactivity.

    5. Heterocycles

      Palladium-Catalyzed Three-Component Reaction of 2,3-Allenyl Amines, Isocyanates, and Organic Halides: A Diversified Assembly of Imidazolidinones (pages 4720–4723)

      Wei Shu, Qiong Yu, Prof. Dr. Guochen Jia and Prof. Dr. Shengming Ma

      Version of Record online: 24 MAR 2011 | DOI: 10.1002/chem.201003611

      Thumbnail image of graphical abstract

      A three-component reaction of 2,3-allenyl amines with isocyanates and organic halides has been developed. Two carbon–nitrogen bonds as well as a carbon–carbon bond were sequentially formed to construct imidazolidinone derivatives in good to excellent yields (see scheme).

    6. Isotopic Labelling

      A Metathesis Approach to Volatile Olefins: Synthesis of 18O-Allyl Alcohol (pages 4724–4726)

      Prof. Dr. Guy C. Lloyd-Jones and Dr. Sophie Purser

      Version of Record online: 21 MAR 2011 | DOI: 10.1002/chem.201100271

      Thumbnail image of graphical abstract

      A neat reaction: A ring-closing metathesis (RCM) strategy is presented in which the two termini of a light, and thus volatile, isotopically labelled olefin are held separate by way of a higher molecular weight diene component, allowing synthetic manipulations to be conducted without difficulty. Using simple laboratory apparatus, a solvent-free catalytic RCM process can be achieved that avoids side reactions and allows isolation of the alkene in high purity.

    7. Stereospecific Olefination

      Stereospecific Benzyne-Induced Olefination from β-Amino Alcohols and Its Application to the Total Synthesis of (−)-1-Deoxy-D-fructose (pages 4727–4731)

      Prof. Jih Ru Hwu and Dr. Yung Chang Hsu

      Version of Record online: 1 MAR 2011 | DOI: 10.1002/chem.201001735

      Thumbnail image of graphical abstract

      'Ole in one! Treatment of β-amino alcohols with CS2 under alkaline conditions gave 1,3-thiazolidine-2-thiones, which were then treated with benzyne generated in situ. The reaction underwent an unprecedented addition–elimination process to give the desired olefins in 60–87 % yields (see scheme; DBU=1,8-diazabicyclo[5.4.0]undec-7-ene).

    8. Hydrolysis

      Hydrolysis of Ammonia Borane Catalyzed by Aminophosphine-Stabilized Precursors of Rhodium Nanoparticles: Ligand Effects and Solvent-Controlled Product Formation (pages 4732–4736)

      Marco Fetz, Roman Gerber, Dr. Olivier Blacque and Dr. Christian M. Frech

      Version of Record online: 17 MAR 2011 | DOI: 10.1002/chem.201003543

      Thumbnail image of graphical abstract

      Releasing hydrogen: Aminophosphine complexes of rhodium are excellent systems for the hydrolysis of H3N[BOND]BH3. The release of H2 in THF/H2O mixtures generates NH3 and B(OH)3 and is based on the sequential catalytic dehydrogenation of H3N[BOND]BH3−n(OH)n and hydrolysis of H2N[DOUBLE BOND]BH2−n(OH)n (n=0–2, see scheme).

    9. Homogeneous Catalysis

      Highly Active Ruthenium(II) Complex Catalysts Bearing an Unsymmetrical NNN Ligand in the (Asymmetric) Transfer Hydrogenation of Ketones (pages 4737–4741)

      Wenjing Ye, Miao Zhao, Wangming Du, Quanbin Jiang, Kaikai Wu, Ping Wu and Prof. Dr. Zhengkun Yu

      Version of Record online: 14 MAR 2011 | DOI: 10.1002/chem.201002039

      Thumbnail image of graphical abstract

      Exceptionally active ruthenium(II) complexes without an ancillary N[BOND]H functionality, but bearing a (chiral) unsymmetrical pyridyl-benzimidazolyl-based NNN ligand, exhibited very high catalytic activity in the (asymmetric) transfer hydrogenation ((A)TH) of ketones. The corresponding Ru[BOND]H complex, which is presumably the catalytically active species, was successfully isolated and structurally characterized by X-ray crystallography.

    10. Rearrangements

      Steering Reaction Pathways: From Benzyl Claisen Rearrangements to Powerful Ionic Shifts (pages 4742–4745)

      Viviana Valerio, Dr. Claire Madelaine and Dr. Nuno Maulide

      Version of Record online: 22 MAR 2011 | DOI: 10.1002/chem.201003591

      Thumbnail image of graphical abstract

      Take a walk on the wild side: A novel benzyl Claisen cascade rearrangement of keteniminium salts is described. The reaction leads to α-arylated lactones under metal-free conditions (top scheme; Tf=trifluoromethanesulfonyl). It is further demonstrated that the cationic intermediates involved can be steered away from pericyclic reaction manifolds into powerful ionic shifts through reaction design (bottom scheme).

    11. Self-Assembly

      Semiconductive, One-Dimensional, Self-Assembled Nanostructures Based on Oligopeptides with π-Conjugated Segments (pages 4746–4749)

      Dr. Yinghui Sun, Dr. Lin Jiang, Dr. Klaus C. Schuermann, Wencke Adriaens, Dr. Li Zhang, Prof. Freddy Yin Chiang Boey, Prof. Luisa De Cola, Prof. Luc Brunsveld and Prof. Xiaodong Chen

      Version of Record online: 14 MAR 2011 | DOI: 10.1002/chem.201003760

      Thumbnail image of graphical abstract

      π Stacking between the β sheets: A newly designed π-conjugated peptide can be assembled into a one-dimensional nanostructure with strong π–π intermolecular electronic communication. A nanoelectronic device based on the achieved individual nanostructure was used to measure conductivity (see graphic).

  7. Full Papers

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Review
    7. Communications
    8. Full Papers
    9. Preview
    1. Semiconducting Materials

      Air-Stable n-Type Organic Field-Effect Transistors Based on Solution-Processable, Electronegative Oligomers Containing Dicyanomethylene-Substituted Cyclopenta[b]thiophene (pages 4750–4758)

      Prof. Yutaka Ie, Kazufumi Nishida, Dr. Makoto Karakawa, Prof. Hirokazu Tada, Atsushi Asano, Dr. Akinori Saeki, Prof. Shu Seki and Prof. Yoshio Aso

      Version of Record online: 23 MAR 2011 | DOI: 10.1002/chem.201002995

      Thumbnail image of graphical abstract

      Conjugated systems: Electronegative, conjugated compounds composed of newly designed dicyanomethylene-substituted cyclopenta[b]thiophene were synthesized as a candidate for air-stable n-type OFET materials. The properties were investigated by photophysical and electrochemical measurements. FP-TRMC measurements revealed the intradomain electron mobility. OFET devices fabricated by spin-coating showed good n-type performances even under ambient conditions.

    2. Gold Nanocrystals

      Seed-Mediated Synthesis of Gold Octahedra in High Purity and with Well-Controlled Sizes and Optical Properties (pages 4759–4764)

      Do Youb Kim, Weiyang Li, Yanyun Ma, Taekyung Yu, Prof. Zhi-Yuan Li, Prof. O Ok Park and Prof. Younan Xia

      Version of Record online: 17 MAR 2011 | DOI: 10.1002/chem.201100365

      Thumbnail image of graphical abstract

      Gold octahedra with uniform, well-controlled sizes were synthesized by using seeded growth. Starting from single-crystal seeds of Au spheres approximately 11 nm in diameter, Au octahedra were obtained with purity >94 % without any purification. In addition, the edge lengths of the Au octahedra could be controlled in the range of 16–77 nm by simply varying the amount of seeds, the concentration of HAuCl4, or both.

    3. Metal Catalysts

      Cr/Ni-Catalyzed Vinylation of Aldehydes: A Mechanistic Study on the Catalytic Roles of Nickel and Chromium (pages 4765–4773)

      Dr. Wacharee Harnying, André Kaiser, Prof. Dr. Axel Klein and Prof. Dr. Albrecht Berkessel

      Version of Record online: 21 MAR 2011 | DOI: 10.1002/chem.201003366

      Thumbnail image of graphical abstract

      It takes two to tango! The initial stages of the Cr/Ni-catalyzed vinylation of aldehydes (the Nozaki–Hiyama–Kishi reaction) were analyzed by electrochemical methods. The role of low-valent nickel in the C[BOND]halogen(Hal) cleavage of the vinyl halide was established, as well as the generation of the former from NiII and CrII.

    4. Enzyme Catalysis

      Tuning the Regio- and Stereoselectivity of C[BOND]H Activation in n-Octanes by Cytochrome P450 BM-3 with Fluorine Substituents: Evidence for Interactions Between a C[BOND]F Bond and Aromatic π Systems (pages 4774–4787)

      Li-Lan Wu, Chung-Ling Yang, Dr. Feng-Chun Lo, Chih-Hsiang Chiang, Chun-Wei Chang, Kok Yaoh Ng, Dr. Ho-Hsuan Chou, Huei-Ying Hung, Prof. Dr. Sunney I. Chan and Dr. Steve S.-F. Yu

      Version of Record online: 11 MAR 2011 | DOI: 10.1002/chem.201003631

      Thumbnail image of graphical abstract

      Activation of F-octanes: Cytochrome P450 BM-3_A74G F87V L188Q (see figure) and the A328F variant regionselectively converted fluorinated C8 alkanes to the corresponding secondary alcohols. The pattern of reactivity, especially the unprecedented regio- and stereoselectivity, observed for 4,4-difluorooctane suggested that specific interactions of the fluorinated substituent with aromatic π systems within the active site could tune the reactivity.

    5. Spermine

      Conformations of Spermine in Adenosine Triphosphate Complex: The Structural Basis for Weak Bimolecular Interactions of Major Cellular Electrolytes (pages 4788–4795)

      Dr. Keisuke Maruyoshi, Toshiyuki Yamaguchi, Tetsuo Demura, Prof. Nobuaki Matsumori, Prof. Tohru Oishi and Prof. Michio Murata

      Version of Record online: 8 MAR 2011 | DOI: 10.1002/chem.201002759

      Thumbnail image of graphical abstract

      Spermines and spin: Spermines (SPM) labeled selectively with 2H and 13C were used to determine the spin–spin coupling constants for six conformationally relevant bonds. SPM revealed diverse conformational changes upon interaction with adenosine triphosphate (ATP), ATP–Mg2+, and tripolyphosphate (TPP, see graph).

    6. Polyoxometalates

      χ-Octamolybdate [MoV4MoVI4O24]4−: An Unusual Small Polyoxometalate in Partially Reduced Form from Nonaqueous Solvent Reduction (pages 4796–4801)

      Dr. Longsheng Wang, Panchao Yin, Dr. Jin Zhang, Dr. Jian Hao, Chunlin Lv, Dr. Fengping Xiao and Prof. Dr. Yongge Wei

      Version of Record online: 14 MAR 2011 | DOI: 10.1002/chem.201002154

      Thumbnail image of graphical abstract

      The first mixed-valent octamolybdate ion [MoV4MoVI4O24]4− containing a MoV cubane core was obtained by reduction of α-(Bu4N)4[Mo8O26] with triethylenetetramine (TETA) and N,N′-dicyclohexylcarbodiimide (DCC) in refluxing dry acetonitrile (see picture).

    7. Photocatalysts

      Self-Assembled 3D Flowerlike Hierarchical Fe3O4@Bi2O3 Core–Shell Architectures and Their Enhanced Photocatalytic Activity under Visible Light (pages 4802–4808)

      Yang Wang, Shikuo Li, Prof. Xianran Xing, Fangzhi Huang, Prof. Yuhua Shen, Anjian Xie, Xiufang Wang and Jian Zhang

      Version of Record online: 8 MAR 2011 | DOI: 10.1002/chem.201001846

      Thumbnail image of graphical abstract

      Petal to the metal: Flowerlike 3D hierarchical Fe3O4@Bi2O3 core–shell architectures were synthesized by a simple and direct solvothermal route without any linker shell. The Fe3O4@Bi2O3 composite microspheres showed much higher (7–10 times) photocatalytic activity than commercial Bi2O3 particles under visible-light irradiation (see image).

    8. Photocontrol of Cytotoxicity

      Photoinduced Nitric Oxide Release from a Nitrobenzene Derivative in Mitochondria (pages 4809–4813)

      Taeko Horinouchi, Dr. Hidehiko Nakagawa, Dr. Takayoshi Suzuki, Dr. Kiyoshi Fukuhara and Prof. Dr. Naoki Miyata

      Version of Record online: 14 MAR 2011 | DOI: 10.1002/chem.201001967

      Thumbnail image of graphical abstract

      NO entry! A novel NO donor (RpNO) containing a 2,6-dimethylnitrobenzene moiety for photocontrollable NO release and a rhodamine moiety for targeting to mitochondria was synthesized (see graphic). It was confirmed that RpNO became localized in the mitochondria of HCT116 colon cancer cells, and showed photodependent cytotoxicity. This is the first example of a photocontrollable, mitochondria-localizing NO donor.

    9. Carbohydrate Recognition

      Chiral Diaminopyrrolic Receptors for Selective Recognition of Mannosides, Part 1: Design, Synthesis, and Affinities of Second-Generation Tripodal Receptors (pages 4814–4820)

      Prof. Cristina Nativi, Dr. Oscar Francesconi, Gabriele Gabrielli, Prof. Alberto Vacca and Dr. Stefano Roelens

      Version of Record online: 8 MAR 2011 | DOI: 10.1002/chem.201002871

      Thumbnail image of graphical abstract

      Highly receptive: A family of second-generation aminopyrrolic tripodal receptors, featuring a chiral diamine as a key structural element, represents a substantial step forward in the design of biomimetic receptors for carbohydrates (see scheme). The new family is selective for mannose, displays high enantiodiscrimination, and features two members showing the best recognition properties reported to date for α- and β-mannosides, respectively.

    10. Chiral Diaminopyrrolic Receptors for Selective Recognition of Mannosides, Part 2: A 3D View of the Recognition Modes by X-ray, NMR Spectroscopy, and Molecular Modeling (pages 4821–4829)

      Dr. Ana Ardá, Prof. F. Javier Cañada, Prof. Cristina Nativi, Dr. Oscar Francesconi, Gabriele Gabrielli, Dr. Andrea Ienco, Prof. Jesús Jiménez-Barbero and Dr. Stefano Roelens

      Version of Record online: 14 MAR 2011 | DOI: 10.1002/chem.201002872

      Thumbnail image of graphical abstract

      Binding modes: The binding modes of the interaction between α- and β-mannosides and chiral diaminopyrrolic tripodal receptors, elucidated by combined X-ray, NMR spectroscopy, and molecular modeling calculations, account for the affinities and the enantioselectivity features measured in a polar solvent. Extensive hydrogen bonding and CH–π interactions are the driving force for recognition, in which docking of the mannosyl into the cleft of the receptor occurs with the β face anchored on the benzenic scaffold through the H-4 proton (see graphic).

    11. Metallomacrocycles

      Dendron-Functionalized Bis(terpyridine)–Iron(II) or –Cadmium(II) Metallomacrocycles: Synthesis, Traveling-Wave Ion-Mobility Mass Spectrometry, and Photophysical Properties (pages 4830–4838)

      Dr. Jin-Liang Wang, Dr. Xiaopeng Li, Xiaocun Lu, Dr. Yi-Tsu Chan, Dr. Charles N. Moorefield, Prof. Dr. Chrys Wesdemiotis and Prof. Dr. George R. Newkome

      Version of Record online: 21 MAR 2011 | DOI: 10.1002/chem.201003681

      Thumbnail image of graphical abstract

      Fives, sixes, and sevens: A series of metallomacrocycles (an example is shown here), utilizing 〈tpy-M-tpy〉 connectivity (M=FeII or CdII) and possessing the first- or second-generation dendrons with 1[RIGHTWARDS ARROW]3 C-branching, has been prepared by a one-pot self-assembly procedure, purified, and characterized. Collision cross sections were obtained by traveling-wave ion-mobility mass spectrometry providing detailed images of their sizes and architectures.

    12. Cyclizations of Alkynes

      Tungsten(0)- and Rhenium(I)-Catalyzed Tandem Cyclization of Acetylenic Dienol Silyl Ethers Based on Geminal Carbo-Functionalization of Alkynes (pages 4839–4848)

      Dr. Hiroyuki Kusama, Yusuke Karibe, Rie Imai, Dr. Yuji Onizawa, Dr. Hokuto Yamabe and Prof. Dr. Nobuharu Iwasawa

      Version of Record online: 21 MAR 2011 | DOI: 10.1002/chem.201003019

      Thumbnail image of graphical abstract

      Geminal carbo-functionalization of 3-siloxy-1,3-dien-7-ynes leading to bicyclo[3.3.0]octane derivatives is achieved through electrophilic activation of alkynes by tungsten(0) and rhenium(I) catalysts (see graphic). Extremely high activity is noted for rhenium(I) catalysts. Furthermore, selective preparation of two different classes of heterocyclic compounds from 5-aza-3-siloxy-1,3-dien-7-ynes is also achieved by appropriate choice of the rhenium(I) catalyst and the protecting group on the nitrogen.

    13. Antioxidants

      Synthesis and Antioxidant Activity of Peptide-Based Ebselen Analogues (pages 4849–4857)

      Kandhan Satheeshkumar and Prof. Dr. Govindasamy Mugesh

      Version of Record online: 11 MAR 2011 | DOI: 10.1002/chem.201003417

      Thumbnail image of graphical abstract

      It all depends: Glutathione peroxidase activity of peptide-based ebselen analogues depends on the nature of the peptide moiety attached to the nitrogen atom of the selenazole ring (see figure). The difference in the antioxidant activity of peptide-substituted selenenyl amides is due to the difference in the reactivity of these compounds toward glutathione and peroxide.

    14. Zintl Clusters

      Reactions of exo-Substituted RSn93− Clusters with Pd: Endohedral Cluster Formation and Oxidative Insertion (pages 4858–4863)

      F. Sanem Kocak, Peter Zavalij and Bryan Eichhorn

      Version of Record online: 23 MAR 2011 | DOI: 10.1002/chem.201002019

      Thumbnail image of graphical abstract

      Charge and mass conservation were observed in the series of Zintl clusters Sn94−[RIGHTWARDS ARROW]1[RIGHTWARDS ARROW]2[RIGHTWARDS ARROW]3 (see scheme). Pyridine/ethylenediamine solutions of [Sn9SnCy3]3− (1) react with [Pd(PPh3)4] to give new clusters [Pd@Sn9SnCy3]3− (2) and [Pd@Sn9PdSnCy3]3− (3), which are the first transition-metal derivates of exo-substituted Zintl clusters.

    15. Extraction Techniques

      Surface Assembly of Graphene Oxide Nanosheets on SiO2 Particles for the Selective Isolation of Hemoglobin (pages 4864–4870)

      Jia-Wei Liu, Dr. Qian Zhang, Dr. Xu-Wei Chen and Prof. Jian-Hua Wang

      Version of Record online: 14 MAR 2011 | DOI: 10.1002/chem.201003361

      Thumbnail image of graphical abstract

      Electric attraction! Graphene oxide (GO) nanosheets were assembled on silica through electrostatic interactions and the GO/SiO2 composites were used, for the first time, as an adsorbent for protein adsorption. Selective isolation of hemoglobin from human whole blood was obtained by carefully manipulating the adsorption/desorption process.

    16. Metallocene Reactivity

      The Importance of a Single Methyl Group in Determining the Reaction Chemistry of Pentamethylcyclopentadienyl Cyclooctatetraenyl Uranium Metallocenes (pages 4871–4878)

      Dr. Michael K. Takase, Dr. Joseph W. Ziller and Prof. William J. Evans

      Version of Record online: 14 MAR 2011 | DOI: 10.1002/chem.201002857

      Thumbnail image of graphical abstract

      What a difference a methyl makes! Attempts to synthesize [(C5Me5)2(C8H8)U], [(C5Me5)(C5Me4H)(C8H8)U], and [(C5Me4H)2(C8H8)U] from [{(C5Me5)(C8H8)U(OSO2CF3)}2] with KC5Me5 and KC5Me4H allowed isolation only of the last two complexes, which differ in reactivity as shown in the scheme.

    17. Self-Assembled Monolayers

      Catalytic Self-Assembled Monolayers on Au Nanoparticles: The Source of Catalysis of a Transphosphorylation Reaction (pages 4879–4889)

      Dr. Giovanni Zaupa, Claudia Mora, Dr. Renato Bonomi, Dr. Leonard J. Prins and Prof. Dr. Paolo Scrimin

      Version of Record online: 14 MAR 2011 | DOI: 10.1002/chem.201002590

      Thumbnail image of graphical abstract

      Metamorphosis of catalytic sites: An experimental and theoretical study of the catalytic efficiency of a mixed monolayer as a function of its composition reveals a clear dependence on the surface morphology (see graphic; SAM=self-assembled monolayer).

    18. Germanium Chemistry

      Synthesis, Structure, and Reactivity of a Pyridine-Stabilized Germanone (pages 4890–4895)

      Dr. Shenglai Yao, Dr. Yun Xiong, Wenyuan Wang and Prof. Dr. Matthias Driess

      Version of Record online: 8 MAR 2011 | DOI: 10.1002/chem.201003409

      Thumbnail image of graphical abstract

      Heavy ketones: The 4-dimethylaminopyridine (DMAP)-supported germanone 2 has been prepared in a facile oxygenation of the DMAP germylene adduct 1 by N2O. Compound 2 reacts as a germanone equivalent with trimethylaluminum to form the Ge[DOUBLE BOND]O addition product 3, in which the DMAP molecule has migrated from the germanium to the aluminum atom (see scheme; Ar=2,6-iPr2C6H3, D=DMAP).

    19. Multicomponent Assembly

      Tandem Insertion of Halocarbenoids and Lithium Acetylides into Zirconacycles: A Novel Rearrangement to Zirconium Alkenylidenates by β-Addition to an Alkynyl Zirconocene (pages 4896–4904)

      Dr. Jozef Stec, Dr. Emma Thomas, Dr. Sally Dixon and Prof. Richard J. Whitby

      Version of Record online: 21 MAR 2011 | DOI: 10.1002/chem.201002962

      Thumbnail image of graphical abstract

      Zirconocene ‘ate’ complexes play several roles in a versatile three-component one-pot assembly of bicyclic organic structures from a 1,6- or 1,7-enyne or -diene, an in situ generated halocarbenoid RCX2Li and a lithium acetylide. The most likely reaction pathway involves the unprecedented β-addition of an organolithium species to an alkynyl zirconocene to give a zirconium alkenylidenate complex.

    20. Asymmetric Synthesis

      A Synthetic Route to Highly Substituted 1,2,3,4-Tetrahydroisoquinolines via Yb(OTf)3-Catalyzed Diastereoselective Ring Opening of Bridged Oxazolidines: Asymmetric Synthesis of 2-Azapodophyllotoxin (pages 4905–4913)

      Dr. Ajay Kumar Srivastava, Minseob Koh and Prof. Dr. Seung Bum Park

      Version of Record online: 14 MAR 2011 | DOI: 10.1002/chem.201002938

      Thumbnail image of graphical abstract

      A concise and efficient synthetic route to highly functionalized enantiopure 1,2,3,4-tetrahydroisoquinolines (THIQs) from the Garner aldehyde via Yb(OTf)3-catalyzed diastereoselective ring opening of bridged oxazolidines is reported. This methodology was successfully applied to the synthesis of four stereoisomers of THIQ and the enantioselective total synthesis of 2-azapodophyllotoxin (1) in eight steps from D-Garner aldehyde in an overall yield of 35.4 %.

    21. Organometallic Synthesis

      Syntheses and X-ray Crystal Structures of Organoantimony Diazides (pages 4914–4920)

      Benjamin Lyhs, Dieter Bläser, Dr. Christoph Wölper and Prof. Dr. Stephan Schulz

      Version of Record online: 14 MAR 2011 | DOI: 10.1002/chem.201002730

      Thumbnail image of graphical abstract

      Upping the anti(mony): Antimony(III)bisazides LSb(N3)2 (L=amidinate; see figure) were synthesized by treating the corresponding fluorides LSbF2 with Me3SiN3.

    22. Nanobowl Preparation

      Single-Crystalline C60 Nanostructures by Sonophysical Preparation: Tuning Hollow Nanobowls as Catalyst Supports for Methanol Oxidation (pages 4921–4926)

      Dr. Yang Zhang, Dr. Lang Jiang, Hui Li, Prof. Louzhen Fan, Prof. Wenping Hu, Chunru Wang, Yongfang Li and Prof. Shihe Yang

      Version of Record online: 14 MAR 2011 | DOI: 10.1002/chem.201002719

      Thumbnail image of graphical abstract

      Hollow nanostructures as catalyst supports: Large-scale single-crystalline hollow nanobowls, nanorings, nanoplates, nanorods, and nanowires of pure C60 have been prepared (see figure) by applying a sonophysical strategy in a binary organic solution. The promise of the C60 hollow structures as Pt catalyst supports is heightened by the significantly enhanced catalytic activity shown toward methanol oxidation for a given amount of C60, demonstrating their potential application in fuel cells.

  8. Preview

    1. Top of page
    2. Cover Picture
    3. Inside Cover
    4. Graphical Abstract
    5. News
    6. Review
    7. Communications
    8. Full Papers
    9. Preview
    1. You have free access to this content
      Preview: Chem. Eur. J. 18/2011 (page 4927)

      Version of Record online: 8 APR 2011 | DOI: 10.1002/chem.201190086

SEARCH

SEARCH BY CITATION