Chemistry - A European Journal

Cover image for Chemistry - A European Journal

December 28, 2007

Volume 14, Issue 1

Pages 3–403

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    1. Cover Picture: Alkali-Metal-Mediated Manganation(II) of Functionalized Arenes and Applications of ortho-Manganated Products in Pd-Catalyzed Cross-Coupling Reactions with Iodobenzene (Chem. Eur. J. 1/2008) (page 3)

      Victoria L. Blair, William Clegg, Ben Conway, Eva Hevia, Alan Kennedy, Jan Klett, Robert E. Mulvey and Luca Russo

      Version of Record online: 17 DEC 2007 | DOI: 10.1002/chem.200790145

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      Here, Newton's cradle demonstrates the concept of alkali-metal-mediated manganation. On its own as part of a conventional organomanganese compound MnII cannot usually directly metalate arene molecules. However, pushed by sodium in the form of a sodium manganate reagent, MnII can form direct Mn[BOND]C(arene) bonds selectively knocking off a hydrogen atom and forming a sodium–manganese–arene complex. In their Full Paper on page 65 ff., R. E. Mulvey et al. discuss the first examples of direct manganation of functionalised arenes.

  2. Editorial

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    1. You have free access to this content
      Communicating Chemistry in “Chemistry” (pages 4–9)

      Neville Compton

      Version of Record online: 17 DEC 2007 | DOI: 10.1002/chem.200701846

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  4. News

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    1. Processing Energy and Signals by Molecular and Supramolecular Systems (pages 26–39)

      Vincenzo Balzani, Alberto Credi and Margherita Venturi

      Version of Record online: 19 OCT 2007 | DOI: 10.1002/chem.200701397

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      Chemistry reloaded: The construction of a variety of molecular devices and machines powered by chemical, photochemical, and electrochemical inputs and the novel conceptual interpretation of known classes of chemical reactions have opened new scenarios on the potentiality of chemistry for energy- and signal-processing at the molecular level.

    2. Total Syntheses of Carbohydrates: Organocatalyzed Aldol Additions of Dihydroxyacetone (pages 40–48)

      Morris Markert and Rainer Mahrwald

      Version of Record online: 31 OCT 2007 | DOI: 10.1002/chem.200701334

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      Total synthesis of carbohydrates: Recent developments of several organocatalyzed aldol methodologies for the total synthesis of carbohydrates to obtain configurationally defined products are discussed.

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    1. “Click” Dendrimers: Synthesis, Redox Sensing of Pd(OAc)2, and Remarkable Catalytic Hydrogenation Activity of Precise Pd Nanoparticles Stabilized by 1,2,3-Triazole-Containing Dendrimers (pages 50–64)

      Cátia Ornelas, Jaime Ruiz Aranzaes, Lionel Salmon and Didier Astruc

      Version of Record online: 30 NOV 2007 | DOI: 10.1002/chem.200701410

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      Branching out: “Click” dendrimers containing 1,2,3-triazolyl ligands (an example of which is shown here) that coordinate to PdII(OAc)2 have been synthesized and reduction with methanol gives precise dendrimer-stabilized Pd nanoparticles that show high efficiency and selectivity in catalytic olefinic hydrogenation.

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      Alkali-Metal-Mediated Manganation(II) of Functionalized Arenes and Applications of ortho-Manganated Products in Pd-Catalyzed Cross-Coupling Reactions with Iodobenzene (pages 65–72)

      Victoria L. Blair, William Clegg, Ben Conway, Eva Hevia, Alan Kennedy, Jan Klett, Robert E. Mulvey and Luca Russo

      Version of Record online: 21 NOV 2007 | DOI: 10.1002/chem.200701597

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      Direct approach: Circumventing the need for indirect metathetical syntheses, the first direct manganation(II) reactions of functionalised arenes using the sodium–MnII base [(tmeda)Na(tmp)(R)Mn(tmp)] (TMEDA=N,N,N′,N′-tetramethylethylenediamine, TMP=2,2,6,6-tetramethylpiperidide, R=CH2SiMe3) are reported together with the conversion of the crystallographically-characterised ortho-manganated intermediates (see figure) thus obtained into unsymmetrical biaryls through Pd-catalysed cross-coupling reactions with iodobenzene.

    3. Coordination-Driven Self-Assembly, Structures, and Dynamic Properties of Diplatinum Hexatriynediyl and Butadiynediyl Complexes in which the sp Carbon Chains are Shielded by sp3 Carbon Chains: Towards Endgroup–Endgroup Interactions (pages 73–87)

      Gareth R. Owen, Jürgen Stahl, Frank Hampel and John A. Gladysz

      Version of Record online: 21 NOV 2007 | DOI: 10.1002/chem.200701268

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      The platinum twist: These platinum complexes are accessed by reactions of trans,trans-[(C6F5){(p-tol3P)2}Pt(C[TRIPLE BOND]C)nPt{(Pp-tol3)2}(C6F5)] and Ar2P(CH2)mPAr2 (m/2n/Ar=8/6/p-tol, 10/6/Ph, 11/6/Ph, 12/6/Ph, 14/6/p-tol, 14/6/ p-C6H4-tBu, 8/4/Ph, 8/4/p-tol). Those with n=3 crystallize with coplanar endgroups in the limiting structures A (m=14; double-helical) and B (m=10, 11; non-helical); those with n=2 have endgroup–endgroup interactions that prohibit coplanarity, and exhibit dissymmetric non-helical conformations in solution.

    4. Linking Two Distinct Layered Networks of Nanosized {Ln18} and {Cu24} Wheels through Isonicotinate Ligands (pages 88–97)

      Jian-Wen Cheng, Jie Zhang, Shou-Tian Zheng and Guo-Yu Yang

      Version of Record online: 2 OCT 2007 | DOI: 10.1002/chem.200700600

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      Synergistic coordination between isonicotinate (IN) and μ3-O ligands, as well as IN and μ4-I ligands under hydrothermal conditions results in two networks of {Dy18} and {Cu24} wheels, built from unusual [Ln33-O)] and [Cu44-I)] cluster cores, respectively, which are stacked, form two kinds of hexagonal channels that interpenetrate each other (see picture) and are further pillared by IN ligands to produce a series of sandwich frameworks: [Ln63-O)2](IN)18[Cu84-I)22-I)3]H3O (Ln: Y, Nd, Dy Gd, Sm, Eu, Tb).

    5. Self-Assembly of a Double Calix[6]arene Pseudorotaxane in Oriented Channels (pages 98–106)

      Arturo Arduini, Alberto Credi, Giovanni Faimani, Chiara Massera, Andrea Pochini, Andrea Secchi, Monica Semeraro, Serena Silvi and Franco Ugozzoli

      Version of Record online: 26 SEP 2007 | DOI: 10.1002/chem.200700748

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      Head-to-tail: A double calix[6]arene with the structure of an asymmetric oriented nanotube, about 2.6 nm long and 1.6 nm wide, can act as a wheel and forms a pseudorotaxane with a 4,4′-bipyridinium (viologen) salt (see picture). The properties of this complex were investigated in solution by UV/Vis absorption spectroscopy and voltammetric methods. In the solid state, the molecule initiates extended oriented tubular structures that give rise to a system of parallel sandwiched nanotubes in the lattice.

    6. Synthesis, Spectroscopic and Electrochemical Characterization, and DFT Study of Seventeen C70(CF3)n Derivatives (n=2, 4, 6, 8, 10, 12) (pages 107–121)

      Alexey A. Popov, Ivan E. Kareev, Natalia B. Shustova, Sergey F. Lebedkin, Steven H. Strauss, Olga V. Boltalina and Lothar Dunsch

      Version of Record online: 30 OCT 2007 | DOI: 10.1002/chem.200700970

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      C70 fullerene clectrochemistry: An electrochemical and DFT study of 17 C70(CF3)n derivatives (see graphic) has shown that E1/2 values for isomers of a given composition can vary by nearly 0.5 V.

    7. On the Origin of the Stereoselectivity in Organocatalysed Reactions with Trimethylsilyl-Protected Diarylprolinol (pages 122–127)

      Peter Dinér, Anne Kjærsgaard, Mette Alstrup Lie and Karl Anker Jørgensen

      Version of Record online: 8 OCT 2007 | DOI: 10.1002/chem.200701244

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      Discover your origins! The mechanism for the α-functionalisation of aldehydes (see scheme) has been investigated by computational methods. This has led to a new insight into the origin of the stereoselectivity.

    8. Highly Enantioselective Approach to Geminal Bisphosphonates by Organocatalyzed Michael-Type Addition of β-Ketoesters (pages 128–135)

      Marinella Capuzzi, Dario Perdicchia and Karl Anker Jørgensen

      Version of Record online: 11 OCT 2007 | DOI: 10.1002/chem.200701317

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      Optically active bisphosphonates were obtained in high yields and enantioselectivities of up to >99 % ee by cinchona alkaloids-catalyzed Michael-type addition of β-ketoesters to ethylidenebisphosphonate esters (see scheme). Further reactions of Michael adducts to the corresponding bisphosphonic acids or vinyl phosphonates have also successfully been performed with conservation of optical purity.

    9. Multivalent Binding of Small Guest Molecules and Proteins to Molecular Printboards inside Microchannels (pages 136–142)

      Manon J. W. Ludden, Xing Yi Ling, Tian Gang, Wojciech P. Bula, Han J. G. E. Gardeniers, David N. Reinhoudt and Jurriaan Huskens

      Version of Record online: 14 NOV 2007 | DOI: 10.1002/chem.200701250

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      Down-sized channels: The immobilization of β-CD monolayers inside microchannels is described. These microchips are designed such that they can be used for the selective immobilization of proteins in different channels. One example is the alternating fashion in which two fluorescently labeled antibodies are immobilized in the chip (see figure).

    10. Isomeric Control of Protein Recognition with Amino Acid- and Dipeptide-Functionalized Gold Nanoparticles (pages 143–150)

      Chang-Cheng You, Sarit S. Agasti and Vincent M. Rotello

      Version of Record online: 30 OCT 2007 | DOI: 10.1002/chem.200701234

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      Recognition of protein surfaces: Calorimetric investigation revealed that nanoparticles (NPs) bearing enantiomeric and diastereoisomeric amino acids/dipeptides (see graphic) display distinctly different binding affinities toward protein targets. This isomeric control of protein recognition has been demonstrated to arise from the noncompensatory enthalpy and entropy contributions in the complex formation.

    11. A Nanoporous Reactor for Efficient Proteolysis (pages 151–157)

      Liang Qiao, Yun Liu, Sarah P. Hudson, Pengyuan Yang, Edmond Magner and Baohong Liu

      Version of Record online: 24 OCT 2007 | DOI: 10.1002/chem.200701102

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      Prot(e)o-types: Mesoporous silicates with cyano functional groups for accommodating trypsin have been proposed as a nanopore-based bioreactor to favor highly efficient protein digestion inside the mesochannels (see graphic).

    12. Synthesis and Characterization of [Cu(NHC)2]X Complexes: Catalytic and Mechanistic Studies of Hydrosilylation Reactions (pages 158–168)

      Silvia Díez-González, Edwin D. Stevens, Natalie M. Scott, Jeffrey L. Petersen and Steven P. Nolan

      Version of Record online: 12 NOV 2007 | DOI: 10.1002/chem.200701013

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      Two is better than one! [Cu(NHC)2]X complexes are easily prepared and are efficient precatalysts for the hydrosilylation of ketones. Relevant steps of the catalytic mechanism have also been demonstrated (see scheme).

    13. New and Efficient Arrays for Photoinduced Charge Separation Based on Perylene Bisimide and Corroles (pages 169–183)

      Lucia Flamigni, Barbara Ventura, Mariusz Tasior, Thomas Becherer, Heinz Langhals and Daniel T. Gryko

      Version of Record online: 9 OCT 2007 | DOI: 10.1002/chem.200700866

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      En-lightening: New tetrapyrrole chromophores for light-energy conversion, namely, free-base corroles are connected to perylene bisimide to form stable dyads that display photoinduced electron transfer resulting in efficient formation of charge-separated states (see picture).

    14. DNA Binding by a New Metallointercalator that Contains a Proflavine Group Bearing a Hanging Chelating Unit (pages 184–196)

      Carla Bazzicalupi, Andrea Bencini, Antonio Bianchi, Tarita Biver, Alessia Boggioni, Sara Bonacchi, Andrea Danesi, Claudia Giorgi, Paola Gratteri, Antonio Marchal Ingraín, Fernando Secco, Claudia Sissi, Barbara Valtancoli and Marcella Venturini

      Version of Record online: 13 SEP 2007 | DOI: 10.1002/chem.200601855

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      A new proflavine-based intercalator and its ZnII complex form DNA adducts according to intercalative and groove-binding processes, as shown by means of spectroscopic methods and stopped-flow measurements. Molecular modelling studies support both binding processes and provide evidence for the influence of NH+⋅⋅⋅O interactions between the protonated acridine nitrogen and the oxygen atoms of the polyanion; this promotes the formation of DNA adducts in which the intercalator penetrates perpendicularly to the base pair hydrogen bonds (see picture).

    15. Polymorphism and Structural Mechanism of the Phase Transformation of Phenyl Carbamate (PC) (pages 197–203)

      Sara Wishkerman and Joel Bernstein

      Version of Record online: 10 OCT 2007 | DOI: 10.1002/chem.200700463

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      Three previously unknown polymorphs of phenyl carbamate are characterized. The phase transformation from form I to form II is rapid by both solution-mediated and solid-state transformation processes. Through comparison of their structures it is possible to propose a mechanism for the transformation.

    16. Bay-Area Selective Thermal [4+2] and [4+4] Cycloaddition Reactions of Triply Linked ZnII Diporphyrin with o-Xylylene (pages 204–211)

      Takayuki Tanaka, Yasuyuki Nakamura and Atsuhiro Osuka

      Version of Record online: 12 NOV 2007 | DOI: 10.1002/chem.200701398

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      Prepare for the unexpected! Unexpected site-selective cycloadditions of triply linked diporphyrins gave a triply linked porphyrin–chlorin hybrid and a bischlorin as respective symmetry-allowed [4+2] and symmetry-forbidden [4+4] cycloadducts (see scheme).

    17. Catalyst Parameters Determining Activity and Selectivity of Supported Gold Nanoparticles for the Aerobic Oxidation of Alcohols: The Molecular Reaction Mechanism (pages 212–222)

      Alberto Abad, Avelino Corma and Hermenegildo García

      Version of Record online: 23 NOV 2007 | DOI: 10.1002/chem.200701263

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      Even nanoparticles need gold: The mechanism of alcohol oxidation by gold nanoparticles supported on nanoparticulated ceria, a general catalyst for aerobic alcohol oxidation (see scheme), has hydride transfer as the rate-determining step.

    18. Ammonium, Alkylammonium, and Amino Acid Complexes of a Hexacopper Fluoro-Metallacrown Cavitand (pages 223–233)

      Leigh F. Jones, Simon A. Barrett, Colin A. Kilner and Malcolm A. Halcrow

      Version of Record online: 26 OCT 2007 | DOI: 10.1002/chem.200701318

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      Copper crowns: The 12-MC-6 copper/fluoro metallacrown shown here binds NH4+ at the center of its Cu6F6 ring, but complexes MeNH3+ and amino acid guests in bowl-shaped cavities above and below it.

    19. Neutral and Cationic Phosphoramide Adducts of Silicon Tetrachloride: Synthesis and Characterization of Their Solution and Solid-State Structures (pages 234–239)

      Scott E. Denmark and Brian M. Eklov

      Version of Record online: 29 OCT 2007 | DOI: 10.1002/chem.200701466

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      The Lewis acid–Lewis base complexation chemistry of SiCl4 and HMPA has been studied in solution and the solid state. The cationic complex 3 HMPA SiCl3+ HCl2 (see figure) has been structurally characterized for the first time.

    20. Reinforced Self-Assembly of Hexa-peri-hexabenzocoronenes by Hydrogen Bonds: From Microscopic Aggregates to Macroscopic Fluorescent Organogels (pages 240–249)

      Xi Dou, Wojciech Pisula, Jishan Wu, Graham J. Bodwell and Klaus Müllen

      Version of Record online: 8 OCT 2007 | DOI: 10.1002/chem.200700921

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      Sticking together like glue! Interesting self-assembly behavior of hexa-peri-hexabenzocoronene derivatives was observed both in solution and the bulk state, owing to hydrogen bonding and π-stacking interactions. Depending on the nature of hydrogen-bonding functionality, some molecules gel organic solvents, which leads to the formation of fluorescent organogels (see figure).

    21. Contrasting Photodynamics between C60–Dithiapyrene and C60–Pyrene Dyads (pages 250–258)

      Dirk M. Guldi, Fabian Spänig, David Kreher, Igor F. Perepichka, Cornelia van der Pol, Martin R. Bryce, Kei Ohkubo and Shunichi Fukuzumi

      Version of Record online: 28 SEP 2007 | DOI: 10.1002/chem.200700837

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      The donor moiety of the 1,6-dithiapyrene–C60 dyad (see graphic) is aromatic in its ground state, but not in the radical ion form. Nonetheless the photogenerated charge-separated state has a remarkably long lifetime for such closely-spaced donor–acceptor systems.

    22. A Fluorescent Molecular Switch Driven by the Input Sequence of Metal Cations: An Azamacrocyclic Ligand Containing Bipolar Anthracene Fragments (pages 259–271)

      Go Nishimura, Hajime Maehara, Yasuhiro Shiraishi and Takayuki Hirai

      Version of Record online: 20 SEP 2007 | DOI: 10.1002/chem.200700797

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      Sequence switching: An azamacrocyclic ligand (L), with two anthracene fragments connected through polyamine bridges, behaves as a fluorescent molecular switch driven by the input sequence of metal cations. Sequential Zn2+[RIGHTWARDS ARROW]Cd2+ addition results in excimer emission, whereas the reverse sequence does not (see picture).

    23. Palladium-Catalysed [3+2] Cycloaddition of Alk-5-ynylidenecyclopropanes to Alkynes: A Mechanistic DFT Study (pages 272–281)

      Rebeca García-Fandiño, Moisés Gulías, Luis Castedo, Juan R. Granja, José L. Mascareñas and Diego J. Cárdenas

      Version of Record online: 22 OCT 2007 | DOI: 10.1002/chem.200700973

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      Mechanisms compete for palladium! The mechanism of the palladium-catalysed [3+2] cycloaddition of alk-5-ynylidenecyclopropanes to alkynes has been studied at the DFT level (see scheme). The most plausible reaction pathway involves four steps. Alkynes substituted with an ester group follow a different mechanism in accord with the experimental observations.

    24. Self-Assemblies Based on [Cp2Mo2(CO)4(μ,η2-P2)]—Solid-State Structure and Dynamic Behaviour in Solution (pages 282–295)

      Manfred Scheer, Laurence J. Gregoriades, Manfred Zabel, Junfeng Bai, Ingo Krossing, Gunther Brunklaus and Hellmut Eckert

      Version of Record online: 26 SEP 2007 | DOI: 10.1002/chem.200700715

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      A versatile ligand: The cluster compound [Cp2Mo2(CO)4(μ,η2-P2)] reacts with a variety of group 11 metal salts to yield monomeric or dimeric complexes. The dicationic species that are invariably obtained, if salts of weakly coordinating anions are employed, display unexpected dynamic behaviour in solution (see illustration), which could be elucidated with the help of DFT calculations.

    25. Non-Innocent Behaviour of Imido Ligands in the Reactions of Silanes with Half-Sandwich Imido Complexes of Nb and V: A Silane/Imido Coupling Route to Compounds with Nonclassical Si[BOND]H Interactions (pages 296–310)

      Stanislav K. Ignatov, Nicholas H. Rees, Alexei A. Merkoulov, Stuart R. Dubberley, Alexei G. Razuvaev, Philip Mountford and Georgii I. Nikonov

      Version of Record online: 26 SEP 2007 | DOI: 10.1002/chem.200700271

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      A new silane/imido coupling mechanism is proposed to account for the reactions of hydrosilanes with the d2 imido complexes [Nb(Cp)([DOUBLE BOND]NR)(PR′3)2]. The initially formed intermediate A, has a penta-coordinate silicon centre and an agostic Si[BOND]H⋅⋅⋅Nb interaction, that rearranges in the example silyl hydride B shown here (R′3=Me3, PhMe2; R′′2=Cl2)

    26. 1,4-Pentenyne as a Five-Carbon Synthon for Efficient and Selective Syntheses of Natural Products Containing 2,4-Dimethyl-1-penten-1,5-ylidene and Related Moieties by Means of Zr-Catalyzed Carboalumination of Alkynes and Alkenes (pages 311–318)

      Gangguo Zhu and Ei-ichi Negishi

      Version of Record online: 30 OCT 2007 | DOI: 10.1002/chem.200701512

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      The enantioselective synthesis of 2,4-dimethyl-1-penten-1,5-ylidene derivatives has been developed and involves the combined use of Zr-catalyzed methylalumination of alkynes (ZMA) and Zr-catalyzed asymmetric carboalumination of alkenes (ZACA; see scheme).

    27. DFT Modeling of Silver Disorder and Mobility in the Semiconductor Cluster [Ag28S26(P(O)PhOMe)12(PPh3)12] (pages 319–324)

      Nathan R. M. Crawford, Claudia Schrodt, Alexander Rothenberger, Weifeng Shi and Reinhart Ahlrichs

      Version of Record online: 7 NOV 2007 | DOI: 10.1002/chem.200701119

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      Getting to the core of the matter: Disorder of silver atoms and high cation mobility are commonly observed and are closely coupled features in silver chalcogenides. In the model compound [Ag28S26(P(O)PhOMe)12(PPh3)12] this disorder of Ag atoms was observed in the crystal structure and investigated by density functional calculations (see figure).

    28. Diastereoselective Synthesis of Three-, Five-, Six-, and Seven-Membered Rings from Fischer Carbene Complexes and 4-Unsubstituted 1-Amino-1,3-Dienes (pages 325–332)

      Fernando Aznar, Martín Fañanás-Mastral, Jorge Alonso and Francisco J. Fañanás

      Version of Record online: 21 SEP 2007 | DOI: 10.1002/chem.200701109

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      Carbocyclization reactions: Three-, five-, six-, and seven-membered rings are easily available in a diastereoselective manner from Fischer carbene complexes and 4-unsubstituted 1-amino-1,3-dienes (see scheme). The nature of the substituent of the carbene complex is crucial to lead the reaction to each type of carbocycle.

    29. Structural Importance of Secondary Interactions in Molecules: Origin of Unconventional Conformations of Phosphine–Borane Adducts (pages 333–343)

      Patrick Spies, Roland Fröhlich, Gerald Kehr, Gerhard Erker and Stefan Grimme

      Version of Record online: 25 SEP 2007 | DOI: 10.1002/chem.200700649

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      Unusual structures: A series of phosphine–borane adducts R3P[BOND]B(C6F5)3 features unconventional eclipsed structures (an example is shown here). A detailed DFT analysis has revealed a combination of secondary interactions to account for this remarkable structural behaviour.

    30. Copper(II)-Mediated Aromatic ortho-Hydroxylation: A Hybrid DFT and Ab Initio Exploration (pages 344–357)

      Peter Comba, Stefan Knoppe, Bodo Martin, Gopalan Rajaraman, Claudio Rolli, Brett Shapiro and Timon Stork

      Version of Record online: 28 SEP 2007 | DOI: 10.1002/chem.200700865

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      Reaction mechanisms: The results of density functional theory (B3LYP) and ab initio (QCISD and CCSD) calculations were used to understand the mechanism of aromatic hydroxylation (see scheme) by a transient terminal copper–oxo complex. Two pathways, a stepwise and a concerted reaction, were considered for the hydroxylation process. The results reveal a clear preference for the concerted pathway, leading to the ortho-selectively hydroxylated product.

    31. Synthesis of Eight- and Star-Shaped Poly(ε-caprolactone)s and Their Amphiphilic Derivatives (pages 358–368)

      Haiying Li, Raphaël Riva, Hans R. Kricheldorf, Robert Jérôme and Philippe Lecomte

      Version of Record online: 26 SEP 2007 | DOI: 10.1002/chem.200700603

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      A successful strategy for the synthesis of novel functional star- and eight-shaped copolyesters (see figure) is described. It relies on the combination of controlled ring-expansion polymerization of lactones, macrocyclization by the intramolecular photo-cross-linking of pendant unsaturations in the very close vicinity of the propagating sites, and “click” chemistry (Huisgen's [2+3] cycloaddition).

    32. Photooxidation of Guanine by a Ruthenium Dipyridophenazine Complex Intercalated in a Double-Stranded Polynucleotide Monitored Directly by Picosecond Visible and Infrared Transient Absorption Spectroscopy (pages 369–375)

      Benjamin Elias, Caitriona Creely, Gerard W. Doorley, Martin M. Feeney, Cécile Moucheron, Andrée Kirsch-DeMesmaeker, Joanne Dyer, David C. Grills, Michael W. George, Pavel Matousek, Anthony W. Parker, Michael Towrie and John M. Kelly

      Version of Record online: 20 SEP 2007 | DOI: 10.1002/chem.200700564

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      Coupling mechanism brought to light: Picosecond transient species formed by photoexcitation of [Ru(dppz)(tap)2]2+ intercalated into [poly(dG-dC)]2 (illustrated) have been observed by both visible and infrared transient absorption spectroscopy, allowing monitoring of the metal complex and DNA nucleobase intermediates respectively. Measurements carried out in D2O show evidence for coupling of the photoinduced electron-transfer process to proton transfer.

    33. Hopeahainol A: An Acetylcholinesterase Inhibitor from Hopea hainanensis (pages 376–381)

      Hui Ming Ge, Chun Hua Zhu, Da Hua Shi, Li Dong Zhang, Dai Qian Xie, Jie Yang, Seik Weng Ng and Ren Xiang Tan

      Version of Record online: 17 OCT 2007 | DOI: 10.1002/chem.200700960

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      Hopeahainol A containing an unprecedented carbon skeleton was characterized as an acetylcholinesterase inhibitor—with its activity comparable to that of huperzine A—from the stem bark of Hopea hainanensis (see figure) which contains two more new polyphenols. Its structure was elucidated by a combination of spectroscopic and single-crystal X-ray analyses along with computational calculations.

    34. Carboxylate Anion Diminishes Chloride Transport through a Synthetic, Self-Assembled Transmembrane Pore (pages 382–396)

      Lei You, Riccardo Ferdani, Ruiqiong Li, Joseph P. Kramer, Rudolph Ernst K. Winter and George W. Gokel

      Version of Record online: 10 OCT 2007 | DOI: 10.1002/chem.200701071

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      Charge for pore entry: Amphiphilic heptapeptides that contained residues of glutamic acid or its ester were found to self-assemble to form anion-conducting pores in phospholipid bilayers (see figure). Studies showed that chloride transport was dependent on the position of glutamate in the peptide chain and on the presence or absence of a free carboxylate group.

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    1. Top of page
    2. Cover Picture
    3. Editorial
    4. Graphical Abstract
    5. News
    6. Concepts
    7. Full Papers
    8. Preview
    1. Preview: Chem. Eur. J. 2/2008 (page 403)

      Version of Record online: 17 DEC 2007 | DOI: 10.1002/chem.200790146

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