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Angewandte Chemie. international edition 84건

  1. [해외논문]   Double Bonds? Studies on the Barrier to Rotation about the Cumulenic C=C Bonds of Tetraaryl[n]cumulenes (n=3, 5, 7, 9)   SCI SCIE

    Bü (Department of Chemistry and Pharmacy & Interdisciplinary Center for Molecular Materials (ICMM), Friedrich-Alexander University Erlangen-Nürnberg (FAU), Nikolaus-Fiebiger Str. 10, 91058, Erlangen, Germany) , hringer, Martina U. (Department of Chemistry and Pharmacy & Interdisciplinary Center for Molecular Materials (ICMM), Friedrich-Alexander University Erlangen-Nürnberg (FAU), Nikolaus-Fiebiger Str. 10, 91058, Erlangen, Germany) , Padberg, Kevin (Department of Chemistry and Pharmacy & Interdisciplinary Center for Molecular Materials (ICMM), Friedrich-Alexander University Erlangen-Nürnberg (FAU), Nikolaus-Fiebiger Str. 10, 91058, Erlangen, Germany) , Phleps, Martin D. (Department of Chemistry and Pharmacy & Interdisciplinary Center for Molecular Materials (ICMM), Friedrich-Alexander University Erlangen-Nürnberg (FAU), Nikolaus-Fiebiger Str. 10, 91058, Erlangen, Germany) , Maid, Harald (Depa) , Placht, Christian , Neiss, Christian , Ferguson, Michael J. , Gö , rling, Andreas , Tykwinski, Rik R.
    Angewandte Chemie. international edition v.57 no.27 ,pp. 8321 - 8325 , 2018 , 1433-7851 ,

    초록

    Abstract Bonding is a fundamental aspect of organic chemistry, yet the magnitude of C=C bonding in [ n ]cumulenes as a function of increasing chain length has yet to be experimentally verified for derivatives longer than n = 5. The synthesis of a series of apolar and unsymmetrically substituted tetraaryl[ n ]cumulenes ( n = 3, 5, 7, 9) was developed and rotational barriers for Z / E isomerization were measured using dynamic VTNMR spectroscopy. Both experiment and theory confirm a dramatic reduction in the rotational barrier (through estimation of Δ G ≠ rot for the isomerization) across the series, from >24 to 19 to 15 to 11 kcal −1 in [ n ]cumulenes with n= 3, 5, 7, 9, respectively. The reduction in cumulenic bonding in longer cumulenes thus affords bond rotational barriers that are more characteristic of a sterically hindered single bond than that of a double bond.

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  2. [해외논문]   A Purely Organic Tricarbanion   SCI SCIE

    Hö (Max-Planck Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470, Mülheim an der Ruhr, Germany) , fler, Denis (Max-Planck Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470, Mülheim an der Ruhr, Germany) , Goddard, Richard (Max-Planck Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470, Mülheim an der Ruhr, Germany) , Lingnau, Julia B. (Max-Planck Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470, Mülheim an der Ruhr, Germany) , Nö (Max-Planck Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470, Mülheim an der Ruhr, Germany) , thling, Nils , List, Benjamin
    Angewandte Chemie. international edition v.57 no.27 ,pp. 8326 - 8329 , 2018 , 1433-7851 ,

    초록

    Abstract How many carbanions can an organic molecule accommodate? The formation of purely organic carbanions with multiple charges is challenging as charge stabilization cannot be achieved through metal coordination. Previously, only quaternary ammonium dicarbanion salts had been reported. By using highly electron‐deficient trifluoromethanesulfonyl (triflyl or Tf) groups, the formation of a purely organic tricarbanion has been realized for the first time.

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  3. [해외논문]   Back Cover: Breslow Intermediates from Aromatic N‐Heterocyclic Carbenes (Benzimidazolin‐2‐ylidenes, Thiazolin‐2‐ylidenes) (Angew. Chem. Int. Ed. 27/2018)   SCI SCIE

    Paul, Mathias (Cologne University, Department of Chemistry, Organic Chemistry, Greinstrasse 4, 50939, Cologne, Germany) , Sudkaow, Panyapon (Cologne University, Department of Chemistry, Organic Chemistry, Greinstrasse 4, 50939, Cologne, Germany) , Wessels, Alina (Cologne University, Department of Chemistry, Organic Chemistry, Greinstrasse 4, 50939, Cologne, Germany) , Schlö (Cologne University, Department of Chemistry, Organic Chemistry, Greinstrasse 4, 50939, Cologne, Germany) , rer, Nils E. (Cologne University, Department of Chemistry, Organic Chemistry, Greinstrasse 4, 50939, Cologne, Germany) , Neudö (Cologne University, Department of Chemistry, Organic Chemistry, Greinstrasse 4, 50939, Cologne, Germany) , rfl, Jö , rg‐ , M. , Berkessel, Albrecht
    Angewandte Chemie. international edition v.57 no.27 ,pp. 8332 - 8332 , 2018 , 1433-7851 ,

    초록

    Breslow intermediates are the mechanistic heart of thiamine catalysis in vitamin B1‐dependent enzymes, such as pyruvate decarboxylase. In their Communication on page 8310 ff., A. Berkessel and co‐workers present the first NMR characterization of a thiamine‐related Breslow intermediate featuring the biologically and organocatalytically relevant aromatic thiazole heterocycle, together with NMR and X‐ray characterization of benzimidazole‐derived Breslow intermediates (cover picture: Adrian von der HOh).

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  4. [해외논문]   Inside Back Cover: Rational Tuning of Fluorobenzene Probes for Cysteine‐Selective Protein Modification (Angew. Chem. Int. Ed. 27/2018)   SCI SCIE

    Embaby, Ahmed M. (Center for Evolutionary Chemical Biology, Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100, Copenhagen, Denmark) , Schoffelen, Sanne (Center for Evolutionary Chemical Biology, Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100, Copenhagen, Denmark) , Kofoed, Christian (Center for Evolutionary Chemical Biology, Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100, Copenhagen, Denmark) , Meldal, Morten (Center for Evolutionary Chemical Biology, Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100, Copenhagen, Denmark) , Diness, Frederik (Center for Evolutionary Chemical Biology, Department of Chemistry, University of Copenhagen, Universitetsparken 5, 2100, Copenhagen, Denmark)
    Angewandte Chemie. international edition v.57 no.27 ,pp. 8831 - 8831 , 2018 , 1433-7851 ,

    초록

    Site‐selective cysteine arylation has been achieved by rational 2D reactivity tuning of fluorobenzene probes. In their Communication on page 8022 ff., M. Meldal, F. Diness et al. demonstrate how probes may be tailored to selectively target cysteine‐containing proteins by adjusting the numbers of fluoro substituents (F x ) and by selecting substituents based on their electron‐withdrawing capacity represented by their Hammett σ p constant.

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