Angewandte Chemie International Edition in English

Cover image for Vol. 28 Issue 6

June 1989

Volume 28, Issue 6

Pages 677–828

Currently known as: Angewandte Chemie International Edition

    1. Cover Picture (Angew. Chem. Int. Ed. Engl. 6/1989)

      Article first published online: 30 DEC 2003 | DOI: 10.1002/anie.198906771

      Thumbnail image of graphical abstract

      The cover picture shows part of the structure of the new molybdenum phosphate [Et4N]6[Na14Mo24P17O97(OH)31xH2O. The most interesting feature of this, at first sight, complicated molecule is the oxidation state of the molybdenum atoms (Mov) as well as the finding that an H3PO4 molecule (green tetrahedron in the center of the picture) lies at the center of a cavity formed by [Mo6P4O24(OH)7]5⊖ anions and Na cations. In addition to the H3PO4 molecule, the cluster anion pictured, [Na12Mo24P17O97(OH)31]8⊖, consists of four[Mo6P4O24(OH)7]5⊖ ions, each composed of six MoO6 octahedra (light and dark blue) and four phosphate groups (green tetrahedra – one HPOmath image and three H2POmath image) units. The MoO6 tetrahedra each share edges with two neighboring octahedra. Red, O atoms; yellow, Na atoms; green, P atoms; blue, Mo atoms. For clarity, the MoO6 octahedra are not fully shown. Further details on this H3PO4 “inclusion complex” are reported by R. C. Haushalter et al. on p. 743 ff.

    2. Graphical Abstract (Angew. Chem. Int. Ed. Engl. 6/1989)

      Article first published online: 30 DEC 2003 | DOI: 10.1002/anie.198906772

  1. Reviews

    1. Top of page
    2. Reviews
    3. Communications
    4. Book Reviews
    5. Reviews
    6. Communications
    7. Conference Report
    8. Book Reviews
    9. Conference Calendar
    1. The Search for Highly Colored Organic Compounds (pages 677–694)

      Dr. Jürgen Fabian and Dr. Rudolf Zahradník

      Article first published online: 30 DEC 2003 | DOI: 10.1002/anie.198906773

      Thumbnail image of graphical abstract

      Receptors for infrared light or NIR dye lasers are just two examples for the use of dyes that absorb light in the near-infrared (NIR) region (λ ≳ 750 nm). The concept of “diradicaloid chromophores” has proven extremely valuable in seeking deeply colored compounds. The triquinone dianion 1 is a recent example of a dye absorbing at extremely long wavelengths (λ = 1 − 2 μm).

    2. General Aspects and Optimization of Enantioselective Biocatalysis in Organic Solvents: The Use of Lipases [New Synthetic Methods (76)] (pages 695–707)

      Prof. Ching-Shih Chen and Prof. Charles J. Sih

      Article first published online: 30 DEC 2003 | DOI: 10.1002/anie.198906951

      Thumbnail image of graphical abstract

      Enzymes and organic solvents were generally considered incompatible. However, enantioselective biocatalysis in nonaqueous media has become increasingly important in preparative organic chemistry, especially for the synthesis of optically active carboxylic acids, esters, and alcohols. An example of reversible enantioselective esterification using lipases is shown below.

    3. Solid Ion Conductors in Heterogeneous Catalysis (pages 708–715)

      Prof. Dr. Hans-Günther Lintz and Prof. Dr. Costas Georgios Vayenas

      Article first published online: 30 DEC 2003 | DOI: 10.1002/anie.198907081

      The widespread introduction of three-way catalysts has focused attention on the electrochemical measurement of oxygen activity using ion-conducting solid electrolytes. Furthermore, solid ion conductors offer a broad range of possible applications in heterogeneous catalysis. Problems of interest include the cogeneration of electrical energy during partial oxidation of methanol to formaldehyde.

    4. Gene Synthesis [New Synthetic Methods (77)] (pages 716–734)

      Prof. Dr. Joachim W. Engels and Dr. Eugen Uhlmann

      Article first published online: 30 DEC 2003 | DOI: 10.1002/anie.198907161

      Thumbnail image of graphical abstract

      Automation was the decisive step in making oligonucleotide synthesis broadly applicable. The variety of synthetic procedures are based ultimately on one of four approaches: the triester method, the phosphite method, the phosphoramidite method, or the H-phosphonate method. The starting compounds are the protected nucleoside derivatives 14 (DMT = dimethoxytrityl).

  2. Communications

    1. Top of page
    2. Reviews
    3. Communications
    4. Book Reviews
    5. Reviews
    6. Communications
    7. Conference Report
    8. Book Reviews
    9. Conference Calendar
    1. Pentabenzylcyclopentadienylpotassium ṁ 3 THF, an Organopotassium Compound with “Piano Stool” Geometry (pages 735–736)

      Prof. Dr. Jörg Lorberth, MSc Sung-Hee Shin, Sigrid Wocadlo and Prof. Dr. Werner Massa

      Article first published online: 30 DEC 2003 | DOI: 10.1002/anie.198907351

      Thumbnail image of graphical abstract

      Structurally elucidated organopotassium compounds are still very rare. A new example is the title compound, in which K⊕ is bonded in an η5 fashion to the cyclopentadienyl ring and is coordinated by the O atoms of three THF molecules (not shown). The arrangement of the benzyl groups also allows the geometry around the potassium ion to be described as a trigonal prism capped on two faces by benzyl groups.

    2. Gas-Chromatographic Enantiomer Separation of Unfunctionalized Cycloalkanes on Permethylated β-Cyclodextrin (pages 736–737)

      Prof. Dr. Volker Schurig, Dipl.-Chem. Hans-Peter Nowotny and Dipl.-Chem. Dieter Schmalzing

      Article first published online: 30 DEC 2003 | DOI: 10.1002/anie.198907361

      In contrast to established procedures for the gas-chromatographic separation of enantiomers (use of amide phases, complexation gas chromatography), which require the presence of polar functional groups in the compounds being separated, a new procedure now makes it possible to discriminate between the enantiomers of unfunctionalized hydrocarbons. This communication describes the enantiomer separation of cis-l-ethyl-2-methylcyclohexane, trans-1,1,3,5-tetramethylcyclohexane, and other alkyl-substituted cyclohexanes on glass capillary columns containing permethylated β-cyclodextrin in polysiloxane solution (inclusion mechanism).

    3. Triple-Decker Complexes as Intermediates in Ring-Ligand Transfers (pages 737–738)

      Prof. Dr. Gerhard E. Herberich, Barry J. Dunne and Dr. Bernd Heßner

      Article first published online: 30 DEC 2003 | DOI: 10.1002/anie.198907371

      Thumbnail image of graphical abstract

      The first borole complexes and, at the same time, the first triple-decker complexes of rhenium and iridium were obtained by ring-ligand transfers of 1 or 2 via triple-decker intermediates such as 3 to give complexes such as 4. Thus, in addition to the earlier postulated monofacial bridging, bifacial bridging is possible in such transfers.

    4. Complete Identification of C[BOND]C Connectivities by Two-Dimensional INADEQUATE NMR Spectroscopy with Composite Pulses (pages 738–740)

      Dr. Jörg Lambert, Dr. Hans Jochen Kuhn and Prof. Dr. Joachim Buddrus

      Article first published online: 30 DEC 2003 | DOI: 10.1002/anie.198907381

      Thumbnail image of graphical abstract

      Off-resonance effects in 2 D INADEQUATE NMR spectroscopy are suppressed by the use of composite pulses instead of simple pulses. At the same time, the signal intensity can increase up to threefold. This method makes it possible to determine the connectivity of carbon frameworks in cases where normal INADEQUATE pulses fail. Its application is exemplified by the structural elucidation of the product obtained from reaction of 1 with peracids.

    5. A New Route to Phosphaalkenes (pages 740–741)

      Dr. Hansjörg Grützmacher and Dr. Hans Pritzkow

      Article first published online: 30 DEC 2003 | DOI: 10.1002/anie.198907401

      Thumbnail image of graphical abstract

      A simple and efficient synthesis of 2-phosphonio-1-phospha-1-alkenes such as 2 was achieved by reaction of phosphinomethylenetriphenylphosphoranes such as 1 with BF3 ·OEt2. Compound 2 is sufficiently stable for X-ray analysis. Dimerization and [2 + 4] cycloadditions, which are typical reactions of phosphaalkenes, were also realized for the phosphonio-substituted compounds.

    6. On the Structure of Eumelanins: Identification of Constitutional Patterns by Solid-State NMR Spectroscopy (pages 741–743)

      Prof. Dr. Martin G. Peter and Dr. Hans Förster

      Article first published online: 30 DEC 2003 | DOI: 10.1002/anie.198907411

      Thumbnail image of graphical abstract

      Eumelanins are deep black, polyphenolic polymers obtained from Dopa 1 or dopamine 2 and containing indole or dihydroindole units, respectively. They are formed by intramolecular addition of the amino groups to the o-quinones generated by oxidation. The results of solid-state 13C NMR spectroscopy confirm the suggested route of formation of eumelanins.

    7. [Et4N]6[Na14Mo24P17O97(OH)31xH2O: A Hollow Cluster Filled with 12 Na⊕ Ions and a H3PO4 Molecule (pages 743–746)

      Dr. Robert C. Haushalter and Frank W. Lai

      Article first published online: 30 DEC 2003 | DOI: 10.1002/anie.198907431

      Thumbnail image of graphical abstract

      The hydrothermal reaction of Na2MoO4, Mo, H3PO4, Et4NOH, and H2O yields the title complex, the structure of which is characterized by tetramers of [Mo6P4O24(OH)7]5⊖ units 1 (Mo = hatched, P = dotted, O = empty circle). The complex structure of the reduced molybdenum phosphate can be rationalized by the differing hydrophilicities of MoO6 and PO4 structural units.

    8. The Organization of Two “Soft” (Cu2⊕, Ni2⊕) Metal Centers in Heterotrinuclear Complexes of a Macrocyclic Ligand by Cocomplexation with Ba2⊕ (pages 746–748)

      Ir. Frank C. J. M. van Veggel, Dr. Martinus Bos, Dr. Sybolt Harkema, Dr. Willem Verboom and Prof. Dr. Ir. David N. Reinhoudt

      Article first published online: 30 DEC 2003 | DOI: 10.1002/anie.198907461

      Thumbnail image of graphical abstract

      The short distances between the two transitionmetal centers in the trinuclear complexes 3 are caused by cocomplexation of Ba2⊕: Cu2⊕:…Cu2⊕ 3.50, Ni2⊕…Ni2⊕ 3.42 Å. The macrocyclic ligand is formed as the complex 2 from o-phenylenediamine and 1 in the presence of Ba2⊕. Complexes 3, in turn, are obtained by treatment of 2 with copper or nickel acetate.

    9. A Novel Type of Anionic Cluster Containing a Pt4Ag2 Core (pages 748–750)

      Prof. Rafael Usón, Prof. Juan Forniés, Dr. Milagros Tomás and Dr. José M. Casas

      Article first published online: 30 DEC 2003 | DOI: 10.1002/anie.198907481

      Thumbnail image of graphical abstract

      The anion 1, X = Cl, is a hexanuclear complex with an unusual structure. The R2Pt(μCl)2PtR2 groups (R [DOUBLE BOND] C6C15) are linked to the two Ag atoms through Pt [RIGHTWARDS ARROW] Ag donor bonds. Cl atoms of the C6C15 ligands and possibly of the μ-Cl bridges also transfer electron density to the Ag atoms. Compound 1, X = Br, was also synthesized.

    10. Aurivillius Phases: A Possible New Class of Metal Oxide Superconductors (pages 750–751)

      Kyeong Ae Yee, Prof. Thomas A. Albright, Dongwoon Jung and Prof. Myung-Hwan Whangbo

      Article first published online: 30 DEC 2003 | DOI: 10.1002/anie.198907501

      Thumbnail image of graphical abstract

      Aurivillius phases (type 1) should be very similar electronically to copper–oxide superconductors when the transition metal M in 1 has a dl or d3 configuration instead of a do configuration. Such materials might exhibit superconductivity. This result, obtained by calculation, should stimulate further experiments in the area of oxidic high- Tc superconductors. ABn−1MnO3n−11 A= Bi2O2; B=electropositive metal; M=early transition metal; O=oxygen; n=number of octahedral layers per perovskite block.

    11. Synthesis, Structure, and Reactivity of a 1,3-Diphospha-2-silaallyl Anion (pages 751–752)

      Prof. Dr. Edgar Niecke, Dipl.-Chem. Elke Klein and Martin Nieger

      Article first published online: 30 DEC 2003 | DOI: 10.1002/anie.198907511

      Thumbnail image of graphical abstract

      A stable, delocalized 3p π-bonding system is present in the lithium salt 1 of the title compound. Compound 1 is surprisingly easy to prepare. The formation of the heteroallyl system is revealed by the η2 coordination of lithium and by the short P[BOND]Si bonds. Reaction of 1 with H2O and with Me3SiC1 affords species containing P = Si bonds (Aryl = 2,4,6-tBu3C6H2).

    12. Additivities of Electrostatic and Hydrophobic Interactions in Host–Guest Complexes (pages 753–754)

      Prof. Dr. Hans-Jörg Schneider and Dipl.-Chem. Isolde Theis

      Article first published online: 30 DEC 2003 | DOI: 10.1002/anie.198907531

      Thumbnail image of graphical abstract

      If electrostatic forces dominate the binding in host–guest complexes, then each ion-pair interaction makes a surprisingly uniform contribution of 5 ± 1 kJ mol−1 to the overall binding. This result was obtained from a detailed study of the binding in a series of host compounds, including the macrocyclic tetraphenolate 1.

    13. Synthesis and Structure of [{(η5-C5Me5)Ti(NH)}3N], a Titanium Imide Nitride (pages 754–755)

      Prof. Dr. Herbert W. Roesky, Yüniu Bai and Dr. Mathias Noltemeyer

      Article first published online: 30 DEC 2003 | DOI: 10.1002/anie.198907541

      Thumbnail image of graphical abstract

      The simple reaction of Cp*TiMe3 with ammonia leads to the title compound 1, the first isolated and structurally characterized titanium imide nitride. Such compounds might serve as precursors for the synthesis of thin titanium nitride films. Cp* [DOUBLE BOND] C5Me5.

    14. A New Synthesis of Key Intermediates for the Preparation of 5,6-DiHETE and Lipoxin A4 (pages 755–757)

      Agnès Gigou, Dr. Jean-Paul Lellouche, Dr. Jean-Pierre Beaucourt, Loïc Toupet and Dr. René Grée

      Article first published online: 30 DEC 2003 | DOI: 10.1002/anie.198907551

      Thumbnail image of graphical abstract

      The highly diastereoselective osmylation of a C [DOUBLE BOND] C bond in proximity to a complex fragment is the key step in the formation of 2 from the butadiene(tricarbonyl)iron complex 1. The diols 2 can be transformed readily into 3, key intermediates in the synthesis of 5,6-DiHETE and lipoxin A4. R [DOUBLE BOND] SiPh2tBu; R′ [DOUBLE BOND] Me; E [DOUBLE BOND] CO2Me.

    15. 1,2,9,10,17,18-Hexasila[2.2.2](1,3,5)cyclophane, a Cage-like Phane Containing Three Si–Si Units (pages 757–758)

      Dr. Akira Sekiguchi, Dipl.-Chem. Tetsuo Yatabe, Dr. Chizuko Kabuto and Prof. Dr. Hideki Sakurai

      Article first published online: 30 DEC 2003 | DOI: 10.1002/anie.198907571

      Thumbnail image of graphical abstract

      The one-step synthesis of the title compound 2 was achieved by coupling the two “layers” 1 with sodium in the presence of 18-crown-6. The yield is very small–as is true of most syntheses in this area–but enough 1 could be prepared to characterize it completely by X-ray structure analysis.

    16. PbMo5O8 and Tl0.8Sn0.6Mo7O11, Novel Clusters of Molybdenum and Thallium (pages 758–760)

      Dipl-Chem. R. Dronskowski and Prof. Dr. A. Simon

      Article first published online: 30 DEC 2003 | DOI: 10.1002/anie.198907581

      Thumbnail image of graphical abstract

      Clusters with three edge-sharing Mo6 octahedra and pairwise linked TI atoms characterize the structure of 1, which fills a gap in the series of compounds containing fragments of the infinite Mo4O6 chain. Compounds are now known that have isolated octahedra or up to five edge-sharing octahedra. The electron count for 1 and for the Pb compound 2 (two condensed octahedra) indicates the existence of inter-cluster bonds and an oxidation state of 2 for TI and Sn or Pb. TI0.8Sn0.6Mn7O111 PbMo5O82

    17. Laser Desorption/Ionization Mass Spectrometry of Proteins of Mass 100 000 to 250 000 Dalton (pages 760–761)

      Dr. Michael Karas, Dr. Ute Bahr, Arndt Ingendoh and Prof. Dr. Franz Hillenkamp

      Article first published online: 30 DEC 2003 | DOI: 10.1002/anie.198907601

      Irradiation of proteins in a nicotinic acid matrix with the 266-nm light of a Nd-YAG laser allowed the first determination of molecular masses up to 250 000 daltons. Since the peaks of multiply charged molecular ions and of oligomer ions can also be used in determination of molecular mass, this method attains a precision of ca. 0.1%. Its potential is demonstrated for β-D-galactosidase, glucose isomerase, and catalase.

    18. Diisocyanogen or Isocyanogen? (pages 761–762)

      Prof. Dr. Lorenz S. Cederbaum, Dr. Francesco Tarantelli, Hans-Georg Weikert, Markus Scheller and Dr. Horst Köppel

      Article first published online: 30 DEC 2003 | DOI: 10.1002/anie.198907611

      This question is unequivocally answered by detailed calculation of the photoelectron spectra. The compound recently synthesized by Bickelhaupt et al. by flash vacuum thermolysis of norbornadienone azine and identified as diisocyanogen CNNC cannot be diisocyanogen on the basis of the PE spectrum. On the other hand, the experimentally measured spectrum agrees very well with that calculated for isocyanogen CNCN.

    19. Surprising Reactions of Decamethylsilicocene with π-Systems of the Type X [DOUBLE BOND] C [DOUBLE BOND] Y (pages 762–763)

      Prof. Dr. Peter Jutzi and Dipl-Chem. Andreas Möhrke

      Article first published online: 30 DEC 2003 | DOI: 10.1002/anie.198907621

      Thumbnail image of graphical abstract

      Completely different products are formed upon reaction of decamethylsilicocene 2 with the structurally related substrates CO2 and CS2. [2 + 1] Cycloaddition results in initial formation of reactive three-membered ring compounds of the type

      , which then react further to give the novel silacycles 1 and 3, respectvely (R[DOUBLE BOND]C5Me5)

    20. The Novel Complex [LRuIV(μ-O)3RuIVL][PF6]2·H2O–a Molecular Section of the Structures of BaRuIVO3 (High-Pressure Phase) and Ba5/6Sr1/6RuIVO3 (pages 763–765)

      Dipl-Chem. Peter Neubold, Dr. Beatriz S. P. C. Della Vedova, Prof. Dr. Karl Wieghardt, Dr. Bernd Nuber and Prof. Dr. Johannes Weiss

      Article first published online: 30 DEC 2003 | DOI: 10.1002/anie.198907631

      Thumbnail image of graphical abstract

      A better understanding of the magnetic properties of ternary oxides such as BaRuO3 and of metal–metal interactions might be offered by complex 3 and the two other new compounds 1 and 2. These compounds were synthesized as PF6 salts. Blue 1 can be oxidized to green 3 via 2 (yellow). Compounds 1 and 3 contain short Ru-Ru bonds. Compound 3 can be converted electrochemically into the mixed valence RuIVRuv and RuIIIRuIV complexes. In 3, two unpaired electrons are present per formula unit (L = N,N′,N″-trimethyl-1,4,7-triazacyclononane).

    21. Ethylenebis(sulfonyl)-bridged 1,1′-Binaphthalene, an Atropisomeric Dienophile for Highly Diastereoselective Diels-Alder Reactions (pages 766–767)

      Dipl-Chem. Sergio Cossu, Dr. Giovanna Delogu, Prof. Dr. Ottorino De Lucchi, Dr. Davide Fabbri and Dr. Giulia Licini

      Article first published online: 30 DEC 2003 | DOI: 10.1002/anie.198907661

      Thumbnail image of graphical abstract

      The 1,1′-binaphthalene derivative 1 is the first acetylene equivalent developed for asymmetric Diels–Alder reactions. It reacts at room temperature with a variety of unsymmetric dienes in a nearly stereospecific fashion. The initial adducts can be cleaved with sodium amalgam to give products corresponding to those formally obtained by acetylene addition to dienes.

    22. Coupling of Epoxides to PtII-Complexes with Carbon Dioxide and the Structure of a Cyclic Metallacarbonate (pages 767–768)

      Khin-Than Aye, Dr. George Ferguson, Dr. Alan J. Lough and Dr. Richard J. Puddephatt

      Article first published online: 30 DEC 2003 | DOI: 10.1002/anie.198907671

      Thumbnail image of graphical abstract

      Model complexes for postulated intermediates in the preparatively important catalytic coupling of CO2 and epoxides to give cyclic carbonates are provided by the compounds 1 (

      = bpy, phen; R = H, Ph, CH2OPh). They are formed upon reaction of [PtMe2(

      )] with epoxides under CO2 atmosphere. In principle, CO2 in the air should be sufficient.

    23. Alkylidene Sulfur Difluorides: F5S(F3C)C[DOUBLE BOND]SF2 and (F3C)2C[DOUBLE BOND]SF2. Synthesis, Structure, and Structure Predictions (pages 769–770)

      Dipl-Chem. Reinhard Damerius, Prof. Dr. Konrad Seppelt and Prof. Dr. Joseph S. Thrasher

      Article first published online: 30 DEC 2003 | DOI: 10.1002/anie.198907691

      Thumbnail image of graphical abstract

      The new alkylidene sulfur difluorides R2C[DOUBLE BOND]SF2 differ structurally and chemically from sulfur ylides

      . The new compounds have a double bond, as shown by the existence of cis/trans isomers (when the two R groups differ). They rearrange to sulfenyl fluorides, R2FC-SF. Theoretical calculations confirm these results, but predict, in addition, a further planar structural isomer, which, in the case of F2C [DOUBLE BOND] SF2, should even be the more stable isomer.

    24. Location of para-Xylene in Yb-Faujasite (Zeolite Y) by Neutron Diffraction (pages 770–772)

      Dipl-Chem. Mirjam Czjzek, Dr. Thomas Vogt and Prof. Dr. Hartmut Fuess

      Article first published online: 30 DEC 2003 | DOI: 10.1002/anie.198907701

      Thumbnail image of graphical abstract

      Rietveld analysis of neutron powder photographs of zeolite Y containing p-xylene revealed an interaction of the methyl groups of p-xylene with the oxygen atoms of the zeolite cage. The p-xylene molecules occupy two crystallographically different positions in the supercage, one of which is shown in the picture on the right. Owing to symmetry, each type of position is present four times.

    25. Amine-Bis(ethene)nickel(o) Complexes; Structure of 1-Azabicyclo[2.2.2]octanebis(ethene)nickel(o) (pages 772–773)

      Dr. Wilfried Kaschube, Priv.-Doz. Dr. Klaus R. Pörschke, Dr. Werner Bonrath, Prof. Dr. Carl Krüger and Prof. Dr. Günther Wilke

      Article first published online: 30 DEC 2003 | DOI: 10.1002/anie.198907721

      Thumbnail image of graphical abstract

      The formation of complexes from “soft” Lewis acids and “hard” bases is disfavored according to the HSAB concept. Surprisingly, however, tris(ethene)nickel(0) and amines afford crystalline complexes of the type [(amine)Ni(C2H4)2] as well as a binuclear complex, [(1,4-diazabicyclo[2.2.2]octane)Ni2(C2H4)4]. The title compound 1 is highly symmetric.

    26. Stereo- and Regiospecific 6-endo-trig-Cyclization of Aryl Radicals, an Entry to Novel Progesterone-Antagonists of the Androstane Series (pages 773–776)

      Dr. Eckhard Ottow, Dr. Günter Neef and Prof. Dr. Rudolf Wiechert

      Article first published online: 30 DEC 2003 | DOI: 10.1002/anie.198907731

      Thumbnail image of graphical abstract

      The phenyl radicals 1 undergo 6-endo-trig cyclization instead of the 5-exo-trig cyclization observed for simple alkenylphenyl radicals. The cyclization products 2 are key compounds for the synthesis of 3 (e.g., X[DOUBLE BOND]OH, Y[DOUBLE BOND]C[TRIPLE BOND]C[BOND]CH3), the first competitive progesterone antagonists in the androstane series. The formation of 2 by a neophyl rearrangement can be excluded for steric reasons. R[DOUBLE BOND]H, OCH3, N(CH3)2.

    27. FeI3SC(NMe2)2, a Neutral Thiourea Complex of Iron(III) Iodide (pages 776–777)

      Prof. Dr. Siegfried Pohl, Ulrich Bierbach and Dipl.-Chem. Wolfgang Saak

      Article first published online: 30 DEC 2003 | DOI: 10.1002/anie.198907761

      Thumbnail image of graphical abstract

      FeI2, I2, and (Me2N)2CS are the starting compounds for the synthesis of 1, the first neutral complex of FeI3. The formation of 1 indicates that, in contrast to earlier assumptions, FeI2 complexes are not thermodynamically unstable. They are presumably reduced to FeII compounds by excess ligand.

    28. Chiral Cyclobutanones by [2 + 2]-Cycloaddition of Dichloroketene to Carbohydrate Enol Ethers (pages 777–778)

      Prof. Dr. Hartmut Redlich, Dr. Jan B. Lenfers and Priv.-Doz. Dr. Jürgen Kopf

      Article first published online: 30 DEC 2003 | DOI: 10.1002/anie.198907771

      Thumbnail image of graphical abstract

      The title reaction was surprisingly easy to carry out and afforded the product in high yield with a partly unexpected stereochemistry. The cyclobutanones formed by dehalogenation of the initial adduct are promising synthetic precursors in view of their high functionality. The transformation 1 [RIGHTWARDS ARROW] 2 demonstrates the possibilities of this reaction.

    29. Pt309Phenmath imageO30 ± 10, a Four-Shell Platinum Cluster (pages 778–780)

      Prof. Dr. Günter Schmid, Dipl.-Chem. Bernd Morun and M.Sc. Jan-Olle Malm

      Article first published online: 30 DEC 2003 | DOI: 10.1002/anie.198907781

      Thumbnail image of graphical abstract

      The title compound (Phen* =phenanthroline derivative) contains the magic number of 309 Pt atoms. In contrast to one-, two-, and five-shell clusters, four-shell clusters were previously unknown. Thus, the preparation of 1 helps bridge the gap between complexes and bulk metals. The Pt atoms in 1, like those in metallic platinum, display cubic close packing. The computer-simulated image on the right shows an M309 cluster viewed in the [110] direction.

    30. The Complexation of Gold Colloids (pages 780–781)

      Prof. Dr. Günter Schmid and Dipl-Chem. Andreas Lehnert

      Article first published online: 30 DEC 2003 | DOI: 10.1002/anie.198907801

      Are colloids large clusters? Both can be stabilized by simple low-molecularweight ligands, as was demonstrated by complexation of gold colloids with the water-soluble phosphane Ph2PC6H4SO3Na. This approach allows not only the study of gold colloids in aqueous solution at any desired concentration, but also the investigation of noncoagulated colloids. These findings open up totally new perspectives in colloid chemistry.

    31. Stable Methyleneboranes of High Lewis Acidity (pages 781–784)

      Dr. Ralf Hunold, Monika Pilz, Jürgen Allwohn, Matthias Stadler, Prof. Dr. Werner Massa, Prof. Dr. Paul von Ragué Schleyer and Prof. Dr. Armin Berndt

      Article first published online: 30 DEC 2003 | DOI: 10.1002/anie.198907811

      Thumbnail image of graphical abstract

      The first stable compounds having

      partial structures, the title compounds 1(Aryl = mesityl or duryl), form adducts 2 with weak Lewis bases like THF and diethyl ether. An increased polarity of the π-bond component of the B-C double bond is revealed by the 11B chemical shifts; evidence of strong C-B hyperconjugation is provided by the anti-van't Hoff geometry of the heteroallene framework and by the long bonds between B and the double-bonded C in the four-membered ring.

    32. Thermal Cleavage and Isomerization of 1,3-Diboretanes to Stable Methyleneboranes (pages 784–786)

      Monika Pilz, Matthias Stadler, Dr. Ralf Hunold, Jürgen Allwohn, Prof. Dr. Werner Massa and Prof. Dr. Armin Berndt

      Article first published online: 30 DEC 2003 | DOI: 10.1002/anie.198907841

      Thumbnail image of graphical abstract

      The stable methyleneboranes 1 and 4, with strongly polarized B–C double bonds, readily form upon melting of the 1,3-diboretanes 2 and 3, respectively. The polarity and stability of 1 and 4 can be easily rationalized by the presence of the silyl substituents, which stabilize negative charges in the α position and electron deficiencies in the β position. Furthermore, they effect kinetic stabilization (Aryl = mesityl or duryl).

  3. Book Reviews

    1. Top of page
    2. Reviews
    3. Communications
    4. Book Reviews
    5. Reviews
    6. Communications
    7. Conference Report
    8. Book Reviews
    9. Conference Calendar
    1. Book Review: Introduction to Synchrotron Radiation. By G. Margaritondo (pages 791–792)

      Heinrich Stuhrmann

      Article first published online: 30 DEC 2003 | DOI: 10.1002/anie.198907912

  4. Reviews

    1. Top of page
    2. Reviews
    3. Communications
    4. Book Reviews
    5. Reviews
    6. Communications
    7. Conference Report
    8. Book Reviews
    9. Conference Calendar
    1. Generation of Complex Metal Oxides by Aerosol Processes: Superconducting Ceramic Particles and Films (pages 794–806)

      Prof. Toivo T. Kodas

      Article first published online: 30 DEC 2003 | DOI: 10.1002/anie.198907941

      Review: High purity complex metal oxide powders with controlled compositions, size distributions and morphologies can be produced by aerosol processing. Regulated deposition of ceramic powders from a gas phase suspension leads to the formation of, for example, thick high-Tc superconductor films.

  5. Communications

    1. Top of page
    2. Reviews
    3. Communications
    4. Book Reviews
    5. Reviews
    6. Communications
    7. Conference Report
    8. Book Reviews
    9. Conference Calendar
    1. Poly-[N,N-(1,4-divinylbenzene-β,β′-diyl)4,4′-bipyridinium dibromide], a Novel Conducting Viologen Polymer (pages 807–808)

      Prof. Dr. Andreas Merz and Dipl-Chem. Stefan Reitmeier

      Article first published online: 30 DEC 2003 | DOI: 10.1002/anie.198908071

      Thumbnail image of graphical abstract

      Communication: The title compound (see Figure) is a new, easily accessible π-conjugated viologen polymer. Properties of particular interest are its conductivity of 1 × 10−3 S cm−1 and electroactivity in the potential region from −0.1 to −0.6 V vs. Ag/AgCI.

    2. Probing Changes in the Structure and Performance of a Lithium Nickel Oxide Catalyst by in situ X-Ray Diffraction During the High-Temperature Oxidative Coupling of Methane (pages 808–810)

      Ingrid J. Pickering, Dr. Peter J. Maddox and Prof. Dr. John M. Thomas

      Article first published online: 30 DEC 2003 | DOI: 10.1002/anie.198908081

      Communication: The advantages of in situ X-ray diffraction in clarifying the onset and nature of the distinct kinds of catalytic action exhibited by a lithium nickel oxide for the oxidation of methane at elevated temperatures are demonstrated. Active solids may possess structural features quite unlike those deduced from measurements conducted at ambient temperatures and pressures emphasizing the need for the development of in situ methods.

    3. High Resolution Electron Microscopy of the High-Tc Superconductor Bi2 + xSr2Ca1 − xCu2O8 + δ (pages 810–813)

      Dr. W. Zhou, Dr. A. I. Kirkland, Dr. K. D. Mackay, Dr. A. R. Armstrong, Dr. M. R. Harrison, Dr. D. A. Jefferson, Dr. W. Y. Liang and Dr. P. P. Edwards

      Article first published online: 30 DEC 2003 | DOI: 10.1002/anie.198908101

      Thumbnail image of graphical abstract

      Communication: The structure of the 85 K Bi-Sr-Ca-Cu-O superconductor has been investigated by means of high resolution electron microscopy combined with image simulation. An ordered one-in-five substitution of calcium by bismuth ions is proposed as the explanation for the observed superlattice formation.

    4. Polymer Benzo[15] crown-5 Complexes as Sensor Materials for Solvent Vapors—Aromatic Halogenated Hydrocarbons and Polar Solvents (pages 813–814)

      Prof. Dr. Franz L, Dickert and Dr. Doris Zeltner

      Article first published online: 30 DEC 2003 | DOI: 10.1002/anie.198908131

      Thumbnail image of graphical abstract

      Communication: For the first time thin layers of polymer-metal complexes with crown ether ligands (see figure) have been applied as sensor materials for the detection of solvent vapors. The hydrophobic properties of these films enable the detection through conductivity measurements of even halogenated and aromatic hydrocarbons.

  6. Conference Report

    1. Top of page
    2. Reviews
    3. Communications
    4. Book Reviews
    5. Reviews
    6. Communications
    7. Conference Report
    8. Book Reviews
    9. Conference Calendar
    1. Martensitic Transformations in Bochum (pages 815–817)

      Norbert Jost

      Article first published online: 30 DEC 2003 | DOI: 10.1002/anie.198908151

    2. Composites and Particle Technology in Las Vegas (pages 817–818)

      Wolfgang A. Kaysser

      Article first published online: 30 DEC 2003 | DOI: 10.1002/anie.198908171

  7. Book Reviews

    1. Top of page
    2. Reviews
    3. Communications
    4. Book Reviews
    5. Reviews
    6. Communications
    7. Conference Report
    8. Book Reviews
    9. Conference Calendar
    1. Book Review: Mathematical Approach to Glass. By M. B. Volf (page 820)

      Günther H. Frischat

      Article first published online: 30 DEC 2003 | DOI: 10.1002/anie.198908201

  8. Conference Calendar

    1. Top of page
    2. Reviews
    3. Communications
    4. Book Reviews
    5. Reviews
    6. Communications
    7. Conference Report
    8. Book Reviews
    9. Conference Calendar
    1. Conference Calendar (pages 823–828)

      Article first published online: 30 DEC 2003 | DOI: 10.1002/anie.198908231

SEARCH

SEARCH BY CITATION