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  • Inorganic Chemistry  (3,733)
  • General Chemistry  (3,093)
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  • 11
    Electronic Resource
    Electronic Resource
    Mössbauer resonance study of the 6H-Type BaFeO2.72Dedicated to Professor Lothar Kolditz on his 60th Birthday (1989)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 576 (1989), S. 108-116 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Mößbauer-Resonanz-Untersuchung des 6H-BaFeO2,72Die nichtstöchiometrische BaFeO3-y-Phase, deren Struktur mit dem 6H-Perowskit-Typ verwandt ist, wurde für y = 0,28 mit Hilfe der Mössbauer-Spektroskopie untersucht. Während für BaFeO2,72 die Röntgenbeugung ein Diagramm zeigt, das dem des stöchiometrischen 6H-BaTiO3 ähnlich ist, zeigt die Mößbauer-Spektroskopie, daß auf Grund der Sauerstofflücken wahrscheinlich eine verzerrte pyramidale Umgebung am high-spin Eisen (IV) vorliegt.
    Notes: The BaFeO3-y phase, the structure of which is related to the 6H-type hexagonal perovskite, has been investigated for y = 0.28 using in particular Mössbauer spectroscopy. An X-ray diffraction analysis of BaFeO2.72 reveals a quite similar pattern to that of the stoichiometric 6H-BaTiO3, but Mössbauer resonance data show the oxygen vacancies to result likely in the formation of distorted pyramidal sites containing high spin iron (IV).
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19895760113
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  • 12
    Electronic Resource
    Electronic Resource
    The Crystal Structure of Potassium Dithioacetate (1975)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 415 (1975), S. 285-288 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Die Kristallstruktur von KaliumdithioacetatKaliumdithioacetat, KCH3CS2 wurde durch Reaktion von Dithioessigsäure mit K2CO3 in wäßriger Lösung dargestellt. Es kristallisiert orthorhombisch in der Raumgruppe Cmcm. Dimensionen der Elementarzelle: a = 7,689, b = 10,565, c = 6,490 Å, Z = 4. Koordinationszahl des Kaliums: 8. Die Strukturverfeinerung nach der Methode der kleinsten Quadrate ergab schließlich R = 0,097.
    Notes: Potassium dithioacetate KCH3CS2 was obtained by action of dithioacetic acid on potassium carbonate in aqueous solution. KCH3CS2 crystallizes orthorhombic within the space group Cmcm. The cell dimensions are: a = 7.689, b = 10.565, and c = 6.490 Å, Z = 4. The coordination number of potassium is 8. Structural refinement by least-squares method came to a final R = 0.097.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19754150313
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  • 13
    Electronic Resource
    Electronic Resource
    Untersuchungen zur Katalyse der Ammoniaksynthese und des Stickstoffisotopenaustausches durch Schichtverbindungen von Graphit mit Eisen, Ruthenium und Osmium (1977)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 428 (1977), S. 231-236 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Investigations on the Catalysis of Ammonia Synthesis and Nitrogen Isotope Exchange by Lamellar Compounds of Graphite with Iron, Ruthenium, and OsmiumThe catalytic activity of transition metal potassium-graphite lamellar compounds for the synthesis of ammonia from the elements and the catalysis of the equilibration by isotope exchange of the isotopic nitrogen molecules are shown to correlate. Connections between the state of metal in the catalyst exist with iron as metal which is shown by Mössbauer spectroscopy and the catalytic activity in relation to the potassium content.
    Notes: Die katalytische Aktivität von Übergangsmetall-Kalium-Graphitverbindungen bei der Synthese von Ammoniak aus den Elementen und bei der Einstellung des Isotopenaustauschgleichgewichts der isotopen Stickstoffmolekeln korrelieren miteinander. Im Falle von Eisen als Metall sind Beziehungen zwischen dem durch Mößbauer-Spektroskopie ermittelten Zustand des Metalls im Katalysator und der katalytischen Aktivität in Abhängigkeit vom Kaliumgehalt erkennbar.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19774280129
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  • 14
    Electronic Resource
    Electronic Resource
    1,3,4-Oxa- und 1,3,4-Thia-diphospholane aus Diphosphorsubstituierten 2-Oxa- und 2-Thia-propanen (1990)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 589 (1990), S. 187-198 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 1,3,4-Oxadiphospholanes and 1,3,4-Thiadiphospholanes from Diphosphorus-substituted 2-Oxa- and 2-Thia-propanesThe synthesis of phosphonates and phosphinates of the type (RO)2(O)PCH2ZCH2P(O)(OR)2, R1(RO)(O)PCH2ZCH2P(O)(OR)2 and R1(RO)(O)PCH2ZCH2P(O)(OR)R1 (with Z = O, S; R = Et, Pri; R1 = Me, Ph) is reported. Acyclic diphosphanes, R1(H)PCH2ZCH2P(H)R2 (with Z = O, S; R1 = R2 = H, Me, Ph; R1 = H, R2 = Me), and 1,3,4-Oxadiphospholanes as well as 1,3,4-Thiadiphospholanes are obtained from the esters by reduction.
    Notes: Die Darstellung von Phosphonaten und Phosphinaten der Zusammensetzung (RO)2(O)PCH2ZCH2P(O)(OR)2, R1(RO)(O)PCH2ZCH2P(O)(OR)2, und R1(RO)(O)PCH2ZCH2P(O)(OR)R1 (mit Z = O, S; R = Et, Pri; R1 = Me, Ph) wird beschrieben. Durch Reduktion der Ester sind die acyclischen Diphosphane, R1(H)PCH2ZCH2P(H)R2 (mit Z = O, S; R1 = R2 = H, Me, Ph; R1 = H, R2 = Me) und 1,3,4-Oxadiphospholane bzw. 1,3,4-Thiadiphospholane zugänglich.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19905890120
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  • 15
    Electronic Resource
    Electronic Resource
    σ,π-C8H8Os(CO)3, ein ungewöhnlicher Cyclooctatetraen-Übergangsmetall-Komplex (1968)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 80 (1968), S. 662-663 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19680801608
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  • 16
    Electronic Resource
    Electronic Resource
    Organische Synthesen mit eingelagerten Reagentien in Schichtsilicaten: Umwandlung von Olefinen in sekundäre Ether bei tiefer TemperaturDiese Arbeit wurde vom Science Research Council unterstützt. (1978)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 90 (1978), S. 290-290 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19780900415
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  • 17
    Electronic Resource
    Electronic Resource
    Exploration of High-Pressure Cycloadducts of Furans and Citraconic Anhydride as Precursors for CD-Ring Fragments of Paclitaxel and Its Analogues (1998)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1998 (1998), S. 2483-2492 
    Details
    ISSN: 1434-193X
    Keywords: Paclitaxel (Taxol®) ; Paclitaxel CD-ring ; High-pressure Diels-Alder reactions ; Furan cycloadditions ; Ether cleavage in 7-oxabicyclo[2.2.1]heptanes ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The high-pressure promoted Diels-Alder reactions between several furans and citraconic anhydride have been studied and the cycloadducts obtained have been explored in new straightforward routes to the CD-ring fragment of paclitaxel. The reaction between furan and citraconic anhydride afforded the exo cycloadduct diastereoselectively, whereas a variety of 2-substituted furans afforded approximate 1:1 mixtures of exo regioisomers. Separation of both regioisomers was accomplished after either diastereoselective esterification or regioselective reduction of the anhydride function. Ether cleavage of the bicyclic compounds by either high-pressure promoted ether cleavage or Boord elimination afforded several potential CD-ring precursors which can be used in the total synthesis of paclitaxel analogues.
    Additional Material: 2 Ill.
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  • 18
    Electronic Resource
    Electronic Resource
    Diastereoselective Conjugate Addition Reactions of 2′-Hydroxypropiophenone to 2′-Hydroxychalcones - Synthesis and Structural Characterization of the Diastereomers of (±)-3-Aryl-1,5-bis(2-hydroxyphenyl)-2,4-dimethyl-1,5-pentanediones (1999)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1999 (1999), S. 1739-1744 
    Details
    ISSN: 1434-193X
    Keywords: Addition reactions ; Diastereoselectivity ; 2′-Hydroxychalcones ; 3-Aryl-1,5-bis(2-hydroxyphenyl)-2,4-dimethyl-1,5-pentanediones ; NMR spectroscopy ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The diastereoselective synthesis of 3-aryl-1,5-bis(2-hydroxyphenyl)-2,4-dimethyl-1,5-pentanediones has been carried out by conjugate addition reactions of 2′-hydroxypropiophenone to 2′-hydroxy-α-methylchalcone derivatives, or in single one-pot reactions of 2′-hydroxypropiophenone with appropriate benzaldehyde derivatives. The structures and stereochemistry of the obtained diastereomers have been determined using various NMR techniques, and the factors determining their formation are investigated and discussed.
    Additional Material: 1 Tab.
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  • 19
    Electronic Resource
    Electronic Resource
    Characterization of a [4Fe-4S]-Ferredoxin Model Based on a Concave Tetradentate Thiol Ligand System (1997)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 130 (1997), S. 23-34 
    Details
    ISSN: 0009-2940
    Keywords: Cavitand ; Electrochemistry ; Iron sulfur cluster ; Metalloprotein model ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: NMR and Mössbauer spectroscopy show that a novel tetrathiol ligand, based on the cavitand diphenylglycoluril, encapsulates a 4Fe-4S cluster and induces asymmetry in it. The cluster gives a weak electrochemical current response in DMF, with a half-wave potential for the 2-/3- reduction vs. Fc+/Fc of -1.7 V. Ba2+ ions are adsorbed, according to X-ray analysis of the SEM image of the electrode, and act as modulator and promoter of the electrochemical response. On the basis of cyclic voltammograms it is proposed that this adsorption creates electroactive sites, changing the type of diffusion controlling the mass transport to the electrode from radial to linear, and that it helps the negatively charged complex, which contains a dipole, to approach the negative electrode in an orientation favourable for electron exchange. This feature makes the complex an important model for ferredoxins, in spite of a difference in redox potential.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19971300105
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  • 20
    Electronic Resource
    Electronic Resource
    Le Systeme Tl2O—V2O5 (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 410 (1974), S. 1-8 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Das System Tl2O—V2O5Das System Tl2O—V2O5 wurde mit Hilfe von thermischen Analysen und durch Röntgenanalyse untersucht. Das gesamte Zustandsdiagramm konnte aufgeklärt werden. Von den meisten erhaltenen Phasen wurden Einkristalle isoliert und die Gitterkonstanten durch Weissenberg und Präzessionsaufnahmen bestimmt. Die an Vanadium reichen Phasen sind mit den entsprechenden Kalium-Verbindungen isotyp. Die an Thallium reichen Phasen Tl4V2O7 und Tl3VO4 zeigen diese Isomorphie nicht, wahrscheinlich wegen der stereochemischen Rolle des einsamen Elektronenpaares des Thalliums(I).
    Abstract: The System Tl2O—V2O5The Tl2O—V2O5 system has been studied by thermal analysis and x-ray analysis. The entire phase diagram is reported. The symmetry and cell dimensions of most of the phases are derived from single crystal photographs. The compounds rich in vanadium are isomorphous with potassium analogues. Such an isomorphism does not exist for compounds like Tl4V2O7 and Tl3VO4; in these cases, the lone pair of thallium(I), doubtless, is stereochemically active.
    Notes: No Absstract.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744100102
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