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  • 1
    Electronic Resource
    Electronic Resource
    [(Trichlorosilyl)dichloroboryl]ethane: Synthesis and Characterisation by Means of Experiment and Theory (1999)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1999 (1999), S. 75-81 
    Details
    ISSN: 1434-1948
    Keywords: TSDE ; Ceramics ; Theoretical IR-spectroscopy ; RI-MP2 ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A new compound for the molecular synthesis route to high-demand Si/B/N/C ceramics has been found and is described in this work. We report on an elegant “one-pot” synthesis of [(trichlorosilyl)dichloroboryl]ethane (TSDE, Cl3Si-CH[(CH3)(BCl2)]) and its structural characterisation by means of nuclear magnetic resonance and (theoretical and experimental) infra-red spectroscopy. Density functional and Hartree-Fock calculations combined with a perturbational treatment of the electron correlation have been performed. Both methods yield good agreement of theoretical and experimental spectra, with the perturbational approach being slightly superior. In a similar way to the amino compound [(trichlorosilyl)amino]dichloroborane (TADB), TSDE exhibits a planar coordination of the dichloroboryl terminus but tetrahedral neighbourhoods for both carbon and silicon. The electronic structure has been investigated and a σ - n order of the frontier orbitals shall be discussed.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    On the Geometry of the Fulleride Dianion C602- in Crystalline Fullerides - Syntheses and Crystal Structures of [M(NH3)6]C60 · 6 NH3 (M = Mn2+, Cd2+) (1998)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1998 (1998), S. 1183-1186 
    Details
    ISSN: 1434-1948
    Keywords: Fullerides ; Crystal structure analysis ; Jahn-Teller effect ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The fullerides [M(NH3)6]C60 (M = Mn2+, Cd2+) have been synthesized by ion exchange in liquid ammonia and analyzed by X-ray single-crystal diffraction. With both complex cations the C602- units are in fixed orientations, and their geometries have been determined with good accuracy. An inspection of the fulleride dianions with respect to geometric deformations in the title compounds and three further independent determinations has led to the conclusion that no significant static Jahn-Teller distortion is present.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Die Kristallstruktur von As2O5, eine neue RaumnetzstrukturDem Andenken Professor Erich Thilos gewidmet (1978)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 441 (1978), S. 5-12 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Crystal Structure of As2O5, a New Type of Framework StructureUsing high oxygen pressure, single crystals of As2O5 were obtained. According to an X-ray crystal structure analysis (space group: P212121; a = 864.6, b = 844.9, c = 462.6 pm) As2O5 exhibits a new type of framework structure consisting of corner sharing AsO4 tetrahedra and AsO6 octahedra. The mean distances As—O are 167.6 pm (As[4]) und 181.8 pm (As[6]).
    Notes: Einkristalle von As2O5 wurden unter Anwendung erhöhter Sauerstoffdrucke erhalten. Der Kristallstrukturanalyse zufolge (Raumgruppe: P212121; a = 864,6, b = 844,9, c = 462,6 pm) besitzt As2O5 eine bisher nicht beobachtete Raumnetzstruktur mit tetraedrisch und oktaedrisch koordiniertem Arsen. Die mittleren As—O-Abstände betragen 167,6 pm (As[4]) und 181,8 pm (As[6]).
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19784410101
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  • 4
    Electronic Resource
    Electronic Resource
    Darstellung und Kristallstruktur von Na2Mn3O7 (1985)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 531 (1985), S. 177-182 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Crystal-Structure of Na2Mn3O7Single crystals of Na2Mn3O7 have been grown hydrothermally applying high oxygen pressure (pO2 = 2 kbar). The new compound cystallizes triclinic; space group P1; a = 6.636(6) Å, b = 6.854(6) Å, c = 7.548(6) Å, α = 105.76(6)°, β = 106.86(6)°, γ = 111.60(6)°; Z = 2. The crystal structure has been solved and refined to R = 7.9% and Rw = 6.2% (diffractometer data, 1044 independent reflexions). The crystal structure consists of ∞2Mn3O72- anions with manganese coordinated octahedrally by oxygen. These layered anions are hold together by Na+ ions (coordination numbers 5 and 6).
    Notes: Einkristalle von bislang unbekanntem Na2Mn3O7 wurden hydrothermal unter hohem Sauerstoffdruck (pO2 = 2 kbar) erhalten, die Kristallstruktur unter Verwendung von Diffraktometerdaten aufgeklärt und verfeinert: P1; a = 6,636(6) Å, b = 6,854(6) Å, c = 7,548(6) Å, α = 105,76(6)°, β = 106,86(6)°, γ = 111,60(6)°; Z = 2; 1044 unabhängige Reflexe; R = 7,9% bzw. Rw = 6,2%. Es liegen im Sinne dichter Packungen angeordnete Sauerstoffdoppelschichten vor, deren Oktaederlücken zu 6/7 mit Mn unter Ausbildung eines ∞2Mn3O72--Anions besetzt werden. Na+ (Koordinationszahl 5 und 6) befindet sich zwischen diesen Schichtpaketen.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19855311224
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  • 5
    Electronic Resource
    Electronic Resource
    Asymmetric Control of 1,3-Dipolar Cycloaddition Reactions with Azomethine Ylides by Means of Proline Esters as Chiral Auxiliary Groups (1995)
    Weinheim : Wiley-Blackwell
    Chemistry - A European Journal 1 (1995), S. 150-154 
    Details
    ISSN: 0947-6539
    Keywords: asymmetric syntheses ; azomethine ylides ; chiral auxiliaries ; cycloadditions ; pyrrolidines ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Upon treatment with triethylamine or DBU in the presence of LiBr, aromatic and aliphatic imines of amino acid esters are converted to N-metalated azomethine ylides. These 1,3-dipoles undergo highly stereoselective cycloadditions with N-acryloyl-(S)-proline esters in THF at -78 to -40°C to afford highly substituted pyrrolidines with complete regiocontrol and good to excellent diastereomeric ratios. The chiral auxiliary groups can readily be removed from the cycloadducts by simple acid hydrolysis. To rationalize the observed stereoselectivity a transition-state model is proposed in which the lithium cation is coordinated to both the 1,3-dipole and the dipolarophile.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/chem.19950010209
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  • 6
    Electronic Resource
    Electronic Resource
    Novel access to polyboro- and polyalumosilazanes suitable as precursors for ternary nitride ceramicsSupport of the Bundesministerium für Forschung and Technologie, Fonds der Chemischen Industrie and Bayer AG is gratefully acknowledged. (1995)
    Weinheim : Wiley-Blackwell
    Advanced Materials 7 (1995), S. 289-292 
    Details
    ISSN: 0935-9648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/adma.19950070309
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  • 7
    Electronic Resource
    Electronic Resource
    Synthese und Konformation von Hexahydro-isochino[3,2-a][2]benzazepinen des B-Homoberbin-TypsHerrn Prof. Dr. Felix Zymalkowski aus Anlaß seines 40. Dozentenjubiläums gewidmet. (1995)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1995 (1995), S. 567-574 
    Details
    ISSN: 0947-3440
    Keywords: Isoquino[3,2-a][2]benzazepines ; B-Homoberbines ; Bischler-Napieralski reaction ; Calculations, MMX force-field ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis and Conformation of Hexahydro-isoquino[3,2-a][2]benzazepines of the B-Homoberbine TypeThe two-step synthesis of the hexahydro-isoquino[3,2-a][2]-benzazepines („B-homoberbines“) 4b-e is described. The main and some further products of the Bischler-Napieralski reaction of hydroxyamide 3c were isolated and identified. The conformation of the B-homoberbines was investigated by X-ray analysis, spectroscopic methods and dehydrogenation with mercury(II) acetate.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.199519950377
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  • 8
    Electronic Resource
    Electronic Resource
    Synthese und Konformation von Hexahydro-isochino[1,2-b][3]benzazepinen (1997)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1997 (1997), S. 447-457 
    Details
    ISSN: 0947-3440
    Keywords: Isoquino[1,2-b][3]benzazepines ; Iso-C-homoberbines ; Conformation analysis ; Bischler-Napieralski reaction ; Methyl ∊-hydroxycarboxylates ; Heterocycles ; Alkaloids ; Drug research ; Medicinal chemistry ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis and Conformation of Hexahydro-isoquino[1.2.-b][3]benzazepinesThe synthesis of the six hexahydro-isoquino[1,2-b][3]benzazepines 13a-f is described; their conformation is investigated by NMR spectroscopic methods, X-ray analysis and dehydrogenation with mercury(II) acetate.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.199719970225
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  • 9
    Electronic Resource
    Electronic Resource
    Darstellung und Reaktionen von Verbindungen mit 5,6-Diazalumibullvalen-Gerüst (1980)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 113 (1980), S. 2154-2174 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Reactions of Compounds of the 5,6-Diazalumibullvalene SeriesThe 9,10-diazasnoutane derivatives 3a und 16 can be rearranged to the 5,6-diazalumibullvalene derivatives 4a and 17 on treatment with acids.  -  The methyl-substituted diazasnoutane 16 is prepared by a new route. This compares favourably with an alternative procedure involving the bromination of methylcyclooctatetraene as a key step.  -  The thermal behaviour of the azo compounds 23 - 26  -  prepared from 4a  -  is investigated.  -  Some azoxy compounds of the 5,6-diazalumibullvalene series have been synthesized. The location of the oxygen atom can not be deduced from NMR spectroscopy and has been established by an X-ray analysis of 37.
    Notes: Die 9,10-Diazasnoutan-Derivate 3a und 16 lassen sich mit Säuren zu den 5,6-Diazalumibullvalen-Derivaten 4a und 17 umlagern.  -  Für die Darstellung des methyl-substituierten Diazasnoutan-Derivats 16 wird ein neuer Weg beschrieben, und es werden dessen Vorteile gegenüber einem alternativen Verfahren, das die Bromierung von Methylcyclooctatetraen beinhaltet, diskutiert.  -  Das thermische Verhalten der aus 4a zugänglichen Azoverbindungen 23 - 26 wird untersucht.  -  Die Position des Sauerstoffs in verschiedenen Azoxyverbindungen mit 5,6-Diazalumibullvalen-Gerüst läßt sich kernresonanzspektroskopisch nicht einwandfrei festlegen und wird über die Röntgenstrukturanalyse von 37 ermittelt.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19801130611
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  • 10
    Electronic Resource
    Electronic Resource
    Schwingungsspektroskopischer Nachweis eines Orthonitrats: Na3[NO4]Diese Arbeit wurde von der Deutschen Forschungsgemeinschaft unterstützt. (1977)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 89 (1977), S. 567-567 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19770890825
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