Angewandte Chemie International Edition in English

Cover image for Vol. 16 Issue 1

January 1977

Volume 16, Issue 1

Pages 1–64

Currently known as: Angewandte Chemie International Edition

  1. Reviews

    1. Top of page
    2. Reviews
    3. Communications
    4. Abstracts
    5. Book Reviews
    1. New Varieties of Sandwich Complexes (pages 1–9)

      Prof. Dr. Helmut Werner

      Version of Record online: 22 DEC 2003 | DOI: 10.1002/anie.197700013

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      Ferrocene, the first sandwich complex, was synthesized 25 years ago. Meanwhile, polynuclear complexes having a sandwich-type structure have also become accessible. Best known are the tripledecker sandwich complexes.

    2. Intramolecular [4+2] and [3+2] Cycloadditions in Organic Synthesis (pages 10–23)

      Prof. Dr. Wolfgang Oppolzer

      Version of Record online: 22 DEC 2003 | DOI: 10.1002/anie.197700101

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      Annelated and bridged ring systems can be prepared by intramolecular cycloaddition of 1,3-dienes, nitrones, and azomethinimines. These regioselective and stereoselective reactions possess great preparative value.

    3. Structural Rules for Globular Proteins (pages 23–32)

      Dr. Georg E. Schulz

      Version of Record online: 22 DEC 2003 | DOI: 10.1002/anie.197700231

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      The three-dimensional structure of proteins is determined by their amino acid sequence. Known protein structures have permitted preliminary derivation of folding rules. Refined rules should eventually provide a means of determining the structures of noncrystalline proteins.

    4. Experimental Electron Densities and Chemical Bonding (pages 32–40)

      Prof. Dr. Philip Coppens

      Version of Record online: 22 DEC 2003 | DOI: 10.1002/anie.197700321

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      Charge density analysis by X-ray and neutron diffraction provides information which is otherwise experimentally inaccessible. Problems studied include the nature of single, double, and triple bonds, lone-pair hybridization, and bonding in metals.

  2. Communications

    1. Top of page
    2. Reviews
    3. Communications
    4. Abstracts
    5. Book Reviews
    1. Crown Ether Catalyzed Reduction of Aromatic Nitro Compounds to Give Amines (page 41)

      Prof. Dr. Howard Alper, Dr. Daniel Des Roches and Dr. Hervé des Abbayes

      Version of Record online: 22 DEC 2003 | DOI: 10.1002/anie.197700411

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      The catalytic activity of the crown ether(1) in the reduction of aromatic nitro compounds by Fe3(CO)12 in KOH may be due to liberation of the unsolvated OH ion.

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    2. Synthesis and Dynamic Behavior of Pentamethylcyclopentadienylboranes (pages 41–42)

      Doz. Dr. Peter Jutzi and Dipl.-Chem. Arnulf Seufert

      Version of Record online: 22 DEC 2003 | DOI: 10.1002/anie.197700412

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      The first cyclopentadienylboranes having boron in allylic position to the ring have now been prepared. The vinylic isomers (2), otherwise always formed preferentially, cannot arise from (1) and its derivatives because the activation energy of the 1,2-methyl shift is too high.

    3. Two Routes to Complex Derivatives of Borole (pages 42–43)

      Prof. Dr. Gerhard E. Herberich, Dipl.-Chem. Joachim Hengesbach, Dr. Ulrich Kölle and Dipl.-Chem. Wolfgang Oschmann

      Version of Record online: 22 DEC 2003 | DOI: 10.1002/anie.197700421

      Thumbnail image of graphical abstract

      The new nido type borole complexes(1) to (3) are stable towards water, in contrast to uncomplexed pentaphenylborole.

    4. The First Oxoferrate(III) Having a Ring Structure: Na14[Fe6O16] (page 43)

      Dipl.-Chem. Gerold Brachtel and Prof. Dr. Rudolf Hoppe

      Version of Record online: 22 DEC 2003 | DOI: 10.1002/anie.197700431

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      Twelve-membered rings with alternate iron and oxygen atoms occur in Na14[Fe6O16]. Fe is surrounded almost tetrahedrally by O, and along [010] two thirds of the FeO4 tetrahedra are coupled in the form of a “Dreier-Doppelkette”.

    5. Stereoselective Hydride Elimination from Organo-Lithium and -Magnesium Compounds (page 44)

      Doz. Dr. Manfred T. Reetz and Wilfried Stephan

      Version of Record online: 22 DEC 2003 | DOI: 10.1002/anie.197700441

      Hydride acceptors effecting elimination of β-hydrogen atoms from organo-lithium and-magnesium compounds have been found in triphenylmethyl tetrafluoroborate, tricyclohexylborane, and tri(sec-butyl) borane.

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    6. Nucleophilic Substitution of Vinylic Hydrogen Atoms by Carbanions (pages 44–45)

      Doz. Dr. Manfred T. Reetz and Dipl.-Ing. Dieter Schinzer

      Version of Record online: 22 DEC 2003 | DOI: 10.1002/anie.197700442

      Chain elongation of activated terminal olefins can be accomplished by the reaction sequence (1)[RIGHTWARDS ARROW](2)[RIGHTWARDS ARROW](3). It is also feasible with R = tert-butyl, cyclopropyl, and other bulky groups.

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    7. Simple Synthesis of (Arylethynyl)triphenylphosphonium Salts (pages 45–46)

      Prof. Dr. Hans Jürgen Bestmann and Dipl.-Chem. Wolfgang Kloeters

      Version of Record online: 22 DEC 2003 | DOI: 10.1002/anie.197700451

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      Phosphonium salts[Ar[BOND]C[TRIPLE BOND]C[BOND]PPh3]CI are interesting synthetic building blocks owing to their CC triple bond. They are now conveniently prepared by the reaction sequence (1)[RIGHTWARDS ARROW](2)[RIGHTWARDS ARROW](3)[RIGHTWARDS ARROW](4).

    8. Synthesis of Protohypericin from Emodin (page 46)

      Dr. Dietrich Spitzner

      Version of Record online: 22 DEC 2003 | DOI: 10.1002/anie.197700461

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      The violet plant pigment protohypericin(1) is formed in the dark by alkaline dimerization of emodin; it is transformed into hypericin by light and oxygen. 1H-NMR decoupling experiments establish the orientation of the two emodin units in (1)

    9. Synthesis of Hypericin and Related meso-Naphthodianthrones by Alkaline Dimerization of Hydroxyanthraquinones (pages 46–47)

      Dipl.-Chem. Gisbert Rodewald, Dr. Rüdiger Arnold, Dipl.-Chem. Johannes Griesler and Prof. Dr. Wolfgang Steglich

      Version of Record online: 22 DEC 2003 | DOI: 10.1002/anie.197700462

      Thumbnail image of graphical abstract

      Alkaline dimerization of emodin(1a) leads to hypericin (2a) instead of isohypericin as formerly assumed. The analogous compounds (1b) and (1c) react in the same way to give (2b) and (2c).

    10. Heat of Hydrogenation of Compounds Containing Isolated and Conjugated C[DOUBLE BOND]N Double Bonds (pages 47–48)

      Prof. Dr. Günter Häfelinger and Dr. Ludger Steinmann

      Version of Record online: 22 DEC 2003 | DOI: 10.1002/anie.197700471

      Thumbnail image of graphical abstract

      Delocalization of π electrons can be deduced from the difference between calculated and experimental heats of hydrogenation. Heats of hydrogenation of compounds containing C[DOUBLE BOND]N double bonds have now been determined directly, e.g. for the imines (1) to (4).

    11. α-Glycosidic Linkage of D-Ribofuranose (pages 48–49)

      Prof. Dr. Richard R. Schmidt and Dipl.-Chem. Peter Hermentin

      Version of Record online: 22 DEC 2003 | DOI: 10.1002/anie.197700481

      Thumbnail image of graphical abstract

      The directing effect of the methoxycarbonyl group in the halouronic esters (1) and (2) is exploited in a glycoside synthesis. For example, they afford the β-methyl and the (hitherto difficultly preparable) α-methylglycoside (3a) in the ratio 1:8 to 1:9. α-Linked disaccharides like (3b) and trisaccharides can also be conveniently prepared by this method.

    12. Fulvenes and Fulvalenes of a Heterocyclic System with 12π Electrons—Pseudophenafulvenes and Pentapseudophenafulvalenes (pages 49–50)

      Prof. Dr. Richard Neidlein and Dr. Arnold D. Kraemer

      Version of Record online: 22 DEC 2003 | DOI: 10.1002/anie.197700491

      Thumbnail image of graphical abstract

      Heterocyclic fulvenes and fulvalenes iso-π-electronic with phenafulvenes and phenafulvalenes have now been prepared. One example is the dark blue crystalline fulvalene (1).

    13. δ-Lactones by Carbonylation of Vinyloxiranes (page 50)

      Priv.-Doz. Dr. Rudolf Aumann and Dipl.-Chem. Horst Ring

      Version of Record online: 22 DEC 2003 | DOI: 10.1002/anie.197700501

      Thumbnail image of graphical abstract

      1,3-Dienes can be conveniently transformed into δ-lactones(2) and (3) in two steps: the diene is epoxidized to (1), which is carbonylated in the presence of transition metals. The overall reaction corresponds formally to addition of CO2, for which no direct method is available.

    14. Elimination of CO from Cyclic Carbonyl Compounds by Flow Pyrolysis (pages 50–51)

      Dr. Gerhard Schaden

      Version of Record online: 22 DEC 2003 | DOI: 10.1002/anie.197700502

      Thumbnail image of graphical abstract

      Polycyclic hydrocarbons such as the difficultly accessible indeno[2,1-a]indene (1) can be obtained by flow pyrolysis in a high vacuum at 960°C.

    15. Diradical-Type Behavior of Tri-tert-butylcyclobutadiene (pages 51–52)

      Prof. Dr. Günther Maier and Dipl.-Chem. Wolfgang Sauer

      Version of Record online: 22 DEC 2003 | DOI: 10.1002/anie.197700511

      Thumbnail image of graphical abstract

      Some typical triplet molecule reactions are observed for tri-tetra-butylcyclobutadiene (1): thus it adds tetrahalomethanes in the dark at room temperature without addition of radical initiatiors. The cyclobutene (2) is formed as sole product.

    16. Tetraaxial Conformation of 1,2,3,4-Tetra-O-benzoyl-β-D-xylopyranose (pages 52–53)

      Priv.-Doz. Dr. Peter Luger, Dipl.-Chem. Gabriele Kothe and Prof. Dr. Hans Paulsen

      Version of Record online: 22 DEC 2003 | DOI: 10.1002/anie.197700521

      Thumbnail image of graphical abstract

      An unusual conformation is found for the tetrabenzoate (1)(2) in the crystalline state. Two independent molecules having the tetraaxial structure (2) are present in the asymmetric unit.

    17. Lithiomethyl(diphenyl)arsane Oxide, a New Reagent (pages 53–54)

      Prof. Dr. Thomas Kauffmann, Dr. Heinz Fischer and Annegret Woltermann

      Version of Record online: 22 DEC 2003 | DOI: 10.1002/anie.197700531

      Thumbnail image of graphical abstract

      CC linkages with carbonyl compounds and organic halides can be accomplished with the newly synthesized arsenic compound (1). The product, e,g. (2), can be decomposed with bromine after prior reduction to (3).

    18. Dipole Metathesis (pages 54–55)

      Priv.-Doz. Dr. Klaus Burger, Dr. Helmut Schickaneder and Dipl.-Chem. Claus Zett

      Version of Record online: 22 DEC 2003 | DOI: 10.1002/anie.197700541

      Thumbnail image of graphical abstract

      Substituted 1,3-butadienes and azomethinimines(3) are obtained as products of a novel synthesis consisting in [3+2]-cycloaddition (1)[RIGHTWARDS ARROW](2) and subsequent [3+2]-cycloreverison (2)[RIGHTWARDS ARROW](3).

    19. A General Procedure for Generating Conjugated 1,x Dipoles (pages 55–56)

      Priv.-Doz. Dr. Klaus Burger, Dr. Helmut Schickaneder and Dipl.-Chem. Claus Zettl

      Version of Record online: 22 DEC 2003 | DOI: 10.1002/anie.197700551

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      Azomethinimines and acetylenes react via [3+2]-cycloaddition to give a bicyclic, which on electrocyclic ring opening again affords an azomethinimine having a longer side chain. The reaction sequence can be repeated, permitting synthesis of 1,x dipoles.

    20. Preparation of Halogen-Bridged Cationic Dinuclear Complexes of Manganese and Rhenium (page 56)

      Dr. Rüdiger Mews

      Version of Record online: 22 DEC 2003 | DOI: 10.1002/anie.197700561

      Cationic carbonyl complexes(1) with a halogen bridge between two manganese or ruthenium atoms have now been prepared by several routes. They are stable up to temperatures exceeding 100°C.

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    21. cis-Bis(dinitrogen)tetrakis(trimethylphosphane)chromium (pages 56–57)

      Dr. Hans Heinz Karsch

      Version of Record online: 22 DEC 2003 | DOI: 10.1002/anie.197700562

      Thumbnail image of graphical abstract

      Two nitrogen molecules are bound in cis orientation in the octahedral complex (1)—the first bis(dinitrogen) complex of a metal from the first transition series.

    22. Electrochemical Reduction of 2,2,2-Trichloroethanols (pages 57–58)

      Dr. Andreas Merz

      Version of Record online: 22 DEC 2003 | DOI: 10.1002/anie.197700571

      Thumbnail image of graphical abstract

      Dichlorides (2) and/or dichloro alcohols(3) arise on electrochemical reduction of trichloroethanols (1), readily accessible from ketones or aldehydes and chloroform.

    23. [2+2]- and [4+2]-Cycloadditions of Arylazoalkenes to Diphenylketene (pages 58–59)

      Dr. Sven Sommer

      Version of Record online: 22 DEC 2003 | DOI: 10.1002/anie.197700581

      Thumbnail image of graphical abstract

      N-Vinyl-1,2-diazetidinones(3) have been synthesized for the first time. In contrast to the very unreactive (E)-azobenzenes, (E)-arylazoalkenes (1) readily react with diphenylketene (2) to give (3) and/or pyridazinones (4).

  3. Abstracts

    1. Top of page
    2. Reviews
    3. Communications
    4. Abstracts
    5. Book Reviews
    1. ABSTRACTS (pages 60–61)

      Version of Record online: 22 DEC 2003 | DOI: 10.1002/anie.197700601

  4. Book Reviews

    1. Top of page
    2. Reviews
    3. Communications
    4. Abstracts
    5. Book Reviews

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