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  • 1
    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: 3 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 560 (1988), S. 141-146 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Oxidation Reactions of the Addition Products of CF3I, Te(CF3)2, and Sb(CF3)3 to CyclohexeneCF3I, Te(CF3)2, and Sb(CF3)3 add to cyclohexen in good to very good yields to form CF3C6H10I, CF3C6H10TeCF3, and CF3C6H10Sb(CF3)2, respectively, which can be oxidized to the corresponding organo iodine, tellurium, and antimony dihalides. The preparations, properties, and 19F NMR spectra of the new compounds are described.
    Notes: CF3I, Te(CF3)2 und Sb(CF3)3 addieren in guten bis sehr guten Ausbeuten an Cyclohexen unter Bildung von CF3C6H10I, CF3C6H10TeCF3 bzw. CF3C6H10Sb(CF3)2, die zu den entsprechenden Organo-iod-, -tellur- bzw. -antimondihalogeniden oxidiert werden können. Die Darstellungen, Eigenschaften und 19F-NMR-Spektren der neuen Verbindungen werden beschrieben.
    Additional Material: 2 Tab.
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 623 (1997), S. 122-128 
    ISSN: 0044-2313
    Keywords: tris(2,6-difluorophenyl)bismuth dihalides ; tris(2,6-difluorophenyl)bismuth bis(trifluoromethanesulfonate) ; tris(2,6-difluorophenyl)bismuth bis(trifluoroacetate) ; 2,6-difluorophenyliodine tetrafluoride ; synthesis ; NMR ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Properties and Reactions of Tris(2,6-difluorophenyl)bismuth(III) and Tris(2,6-difluorophenyl)bismuth(V) Derivatives(2,6-F2C6H3)3BiF2 and (2,6-F2C6H3)3BiCl2 are prepared oxidizing (2,6-F2C6H3)3Bi with XeF2 or Cl2 respectively, while direct fluorination effect the oxidation of the aromatic system. The reaction of (2,6-F2C6H3)3BiCl2 With (CH3)3SiCl yields (2,6-F2C6H3)3BiCl2. Attempts to oxidize (2,6-F2C6H3)3Bi with Br2, I2 and ICl give (2,6-F2C6H3)X and BiX′3 (X = Br, I; X′ = Cl, Br, I). The rection of (2,6-F2C6H3)3Bi with IF5 gives BiF3 and (2,6-F2C6H3)IF4. (2,6-F2C6H3)3Bi(OCOCF3)2 and (2,6-F2C6H3)3Bi(OSO2CF3)2 are formed via ligand exchange rection of (2,6-F2C6H3)3BiF2 with (CH3)3SiOR or of (2,6-F2C6H3)3BiCl2 with AgOR (R = COCF3, SO2CF3). The preparations and properties of the new compounds are described. (2,6-F2C6H3)3Sb and (2,6-F2C6H3)2Te are prepared by the transmetalation reactions of (2,6-F2C6H3)3Bi with Sb and Te.
    Notes: (2,6-F2C6H3)3 BiF2und(2,6-F2C6H3)3BiCl2 werden durch Oxidation von (2,6-F2C6H3)3 Bi mit XeF2 bzw. Cl2 dargestellt, während die Direktfluorierung zu einer Oxidation des aromatischen Systems führt, (2,6-F2C6H3)3BiCl2 wird auch durch die Umsetzung von (2,6-F2C6H3)3 BiF2 mit (CH3)3SiCl erhalten. Oxidationsversuche von (2,6-F2C6H3)3Bi mit Br2, I2 und ICl ergeben (2,6-F2C6H3)X und BiX′3 (X = Br, I; X′ = Cl, Br, I). Die Umsetzung von (2,6-F2C6H3)3Bi mit IF5 führt zur Bildung von BiF3 und (2,6-F2C6H3)IF4. (2,6-F2C6H3)3Bi(OCOCF3)2 bzw. (2,6-F2C6H3)3Bi(OSO2CF3)2 werden durch Ligandenaustauschreaktionen von (2,6-F2C6H3)3BiF2 mit (CH3)3SiOR oder von (2,6-F2C6H3)3BiCl2 mit AgOR gebildet (R COCF3, SO2CF3). Die Syntheseverfahren und Eigenschaften der neuen Verbindungen werden beschrieben. Durch Transmetallierungsreaktionen von (2,6-F2C6H3)3Bi mit Te und Sb werden (2,6-F2C6H3)3Sb und (2,6-F2C6H3)2Te dargestellt.
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  • 4
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Surface Compounds of Transition Metals. XIX. The Complex Formation of Surface CrII/Silicagel with Water, Alcohol, Ether, Silanol, Siloxane, and with Neighbouring Surface Groups of the XOY TypeSurface chromium(II) reacts with the oxygen donor ligands H2O, ROH, R2O and R3SiOH with formation of (violet) 1:2 and (blue) 1:4 complexes, which are characterized by their reflectance spectra (〉Cr(tBuOH)2 and 〉Cr(OEt2)2 by direct determination of stoichiometry also).The extremely weak donor (R3Si)2O froms a steel-blue 1:1 complex. The shift of the dd absorption observed during complex formation corresponds with the spectral phenomena of the transition from very reactive to less reactive free surface species. The decrease in quality is therefore proposed to be due to the coordination of one surface group.Rehydroxylation of surface CrVI/silicagel by H2O(g) results in an increasing number of surface silanol groups; the chromium-to-surface bond is retained. The quality of CrII surface compounds made from these products decreases proportionally to the SiOH content. In agreement with former results it is concluded that the surface CrII as well as the coordinating surface silanol groups are situated on surface areas which correspond to the (100) planes of cristobalite.
    Notes: O'fl.-Chrom(II) auf Silicagel reagiert mit den Sauerstoff-Donorliganden H2O, ROH, R2O und R3SiOH unter Bildung von (violetten) 1:2- und (blauen) 1:4-Komplexen, die sich durch ihre Reflexionsspektren, im Falle von 〉Cr(tBuOH)2 und 〉Cr(OEt2)2 auch durch direkte Bestimmung der Stöchiometrie charakterisieren lassen. Der extrem schwache Donor (R3Si)2O bildet einen stahlblauen 1:1-Komplex. Der hierbei auftretende shift der dd-Banden entspricht der spektralen Verschiebung beim Übergang von hochreaktivem zu weniger reaktivem freien O'fl.-CrII. „Qualitätsabnahme“ wird daher auf die Absättigung mit einer benachbarten Oberflächengruppe zurückgeführt.Rehydroxylierung von O'fl.-CrVI/Silicagel mit H2O(g) führt zu einer Zunahme der Silanol-Gruppen auf der Träger-Oberfläche, wobei die Cr-Oberflächenbindung erhalten bleibt. Die Qualität der aus diesen Produkten erhaltenen CrII-O'fl.-Verbindungen nimmt dabei proportional zum SiOH-Gehalt ab. Unter Berücksichtigung früherer Ergebnisse läßt sich folgern, daß sowohl das O'fl.-CrII wie auch die koordinierenden O'fl.-Silanolgruppen an den der (100)-Fläche des Cristobalits analogen Oberflächenbezirken des Gels fixiert sind.
    Additional Material: 12 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 444 (1978), S. 145-150 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Vibrational Spectra of Iodine Tris(trifluoroacetate)The vibrational spectra of the title compound in the solid state, acetonitrile solution as well as in the gas phase are described and discussed.
    Notes: Die Schwingungsspektren von J(OCOCF3)3 im festen Zustand, in Acetonitril-Lösung sowie in der Gasphase werden beschrieben und diskutiert.
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 618 (1992), S. 74-76 
    ISSN: 0044-2313
    Keywords: Tris(fluoraryl)boranes ; preparation ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Preparation and Properties of New Tris(fluoroaryl)boranesB(2-FC6H4)3, B(4-FC6H4)3, B(2,6-F2C6H3)3 and B(C5F4N)3 are prepared from the reactions of RMgX with boron trifluoride, B(OC6F5)3 and B(SC6F5)3 from C6F5XH (X = O, S) and boron trichloride. The synthetic routes and the properties of these mainly new compounds are described.
    Notes: B(2-FC6H4)3, B(4-FC6H4)3, B(2,6-F2C6H3)3 und B(C5F4N)3 werden durch Reaktionen von RMgX mit Bortrifluorid, B(OC6F5)3 und B(SC6F5)3 aus C6F5XH (X = O, S) mit Bortrichlorid dargestellt. Die Syntheseverfahren und die Eigenschaften der meist neuen Verbindungen werden beschrieben.
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  • 7
    ISSN: 0044-2313
    Keywords: Xenon-oxo compounds ; 129Xe n.m.r. study ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Lewis-Acid Initiated Syntheses of Xenon-Oxo Compounds - a 129Xe-NMR StudyThe reaction of XeF2 with B(OR)3 yield FXeOR (R: SO2CF3) and Xe(OR)2 (R: COCF3), respectively. In the second case the intermediate formation of FXeOCOCF3 is detectable. In a solution of XeF2 and BF3 · O(CH3)2 in CD3CN the cation [FXe.NCCD3]+ can be observed. The syntheses of FXeOR (R: SO2CF3, SO2C4F9) and Xe(OR)2 (R:COCF3, COC2F5) also succeed in the reaction of XeF2 with the corresponding alkali metal sulfonates and carboxylates in the presence of BF3 · O(CH3)2. Due to the 129Xe-NMR spectra the mechanism of formation and the bond types of these partly new derivatives are discussed.
    Notes: Bei den Reaktionen von XeF2 mit B(OR)3 entstehen FXeOR (R: SO2CF3) bzw. Xe(OR)2 (R:COCF3); dabei ist auch die intermediäre Bildung von FXeOCOCF3 nachweisbar. In einer Lösung von Xef2 und BF3 · O(CH3)2 in CD3CN wird das Vorliegen von [FXe · NCCD3]+ beobachtet. Die Synthesen von FXeOR (R: SO2CF3, SO2C4F9) sowie Xe(OR)2 (R:COCF3,COC2F5) gelingen ebenfalls durch die Umsetzungen von XeF2 mit den entsprechenden Alkalimetallsulfonaten bzw. -carboxylaten in Gegenwart von BF3 · O(CH3)2. Anhand der129Xe-NMR Spektren werden die Bildungsmechanismen und die Bindungsverhältnisse dieser teilweise neuen Xenonderivate diskutiert.
    Additional Material: 3 Ill.
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  • 8
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 338 (1996), S. 283-286 
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Trifluoromethyl Zinc Bromide - A Useful Trifluoromethylation and Difluoromethylation Reagent
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  • 9
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The conformation of phenylacetyl-D-alanyl-D-alanine in the crystalline state was characterized by Fourier-transform ir and Raman spectroscopy and was unambiguously solved by x-ray single-crystal determination. In the crystalline state, the molecule adopts a partially folded conformation quite similar to that of another cell wall peptide, acetyl-D-alanyl-D-alanine [Benedetti et al. (1981) J. Biol. Chem. 256, 9229-9234], although the crystal structure is stabilized by a quite different intermolecular hydrogen-bond pattern. No significant deviation from the usual trans-planar peptide group geometry was detected. The conformations accessible in the noncrystalline state were investigated by ir measurements in solution and conformational energy calculations. The theoretical study revealed that the peptide is a highly flexible molecule, since 55 minima were detected, within 3 kcal/mol, including the conformation found in the single crystal. The ir data for phenylacetyl-D-alanyl-D-alanine in different solvents were in accordance with virtually extended conformations, with some indication for weak, intramolecularly hydrogen-bonded C5-rings. These conformational data obtained for the cell wall peptide analog are compared with those known for penicillin G in the crystalline state.
    Additional Material: 7 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 309 (1961), S. 37-48 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: By investigation of the exchange behaviour of zirkonium on cation and anion exchange resins in concentrated chloride solutions, the nature of the chlorocomplexes of zirkonium has been studied. The results have been confirmed by determination of the migration direction of Zr in hydrochloric acid.The formation of Zr-chlorocomplexes in dependance on the concentration of HCl is discussed and compared with the corresponding behaviour of hafnium.
    Notes: Durch Untersuchung des Austauschverhaltens von Zirkon in konzentrierten Chloridlösungen an Anioniten und Kationiten werden Aussagen über Chlorokomplexe des Zirkons gewonnen. Die Bestimmung der Elektrolytischen Wanderungsrichtung des Zirkons in steigender Salzsäurekonzentration unterstützt diese Schlußfolgerungen. Das Komplexverhalten des Zirkons in Abhängigkeit von der Salzsäurekonzentration wird diskutiert und mit dem des Hafniums verglichen.
    Additional Material: 9 Ill.
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