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  • 1
    Electronic Resource
    Electronic Resource
    Activity of Peroxo and Hydroperoxo Complexes of TiIV in Olefin Epoxidation: A Density Functional Model Study of Energetics and Mechanism (1999)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1999 (1999), S. 2135-2145 
    Details
    ISSN: 1434-1948
    Keywords: Density functional calculations ; Epoxidation ; Peroxo complexes ; Titanium ; Transition states ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Epoxidation of olefins by TiIV peroxo and hydroperoxo (alkylperoxo) complexes was investigated using a hybrid DFT method (B3LYP). Reaction energies and activation barriers for direct oxygen transfer to ethylene as a model olefin were computed for various model complexes to compare the epoxidation activity of Ti(η2-O2) and TiOOR (R = H, CH3) moieties. The activity of complexes with a Ti(O2) peroxo group is shown to be essentially quenched when the coordination sphere of the complex is saturated by strongly basic (σ-donor) ligands. In contrast, the activity of a TiOOH functional group depends only weakly on the saturation of the coordination sphere of the Ti center. Substitution of methyl for hydrogen in a TiOOH group is found to slightly increase the activation barrier of epoxidation. The computational results give preference to reaction paths that involve TiOOR species. The factors governing the activity of Ti(O2) and TiOOR groups, in particular the effects of donor ligands, are discussed on the basis of a molecular orbital analysis.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Progress in synthesis and application of segmented polymersDedicated to Prof. Dr. H. Sinn on the occasion of his 65th birthday (1994)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 223 (1994), S. 47-60 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Maßgeschneiderte segmentierte Polymere spielen eine Schlüsselrolle bei der Entwicklung von neuen polymeren Materialien. In Abhängigkeit von den molekularen Architekturen der segmentierten Polymeren kann die Ausbildung von Polymermorphologien und von Eigenschaftssynergien gesteuertwerden. An ausgewählten Beispielen werden grundlegende Konzepte und neuere Entwicklungen vorgestellt. Segmentierte Silikon-Flüssigkautschuke, wo unverträgliche Silikonsegmente von zwei mischbaren Oligo(caprolacton)-Segmenten flankiert werden, sind wirkungsvolle Zähmodifikatoren für Epoxidharze. In nanophasenseparierten IPNs auf Basis dieser Silikon-modifizierter Epoxidharze kann die Schlagzähigkeit ohne Verlust der Dimensionsstabilität erhöht werden. Kompatibilisierte Blends aus segmentierten phenolischen Polyurethan- und epoxidfunktionellen Nitril-Flüssigkautschuken bilden diskrete Blend-Mikrophasen, die in Epoxidprepregs dispergiert sind und strukturelles Verkleben von Aluminium in Faser-Metall Laminaten ermöglichen. Reaktive Blendtechnologien werden entwickelt, um während der Polymerverarbeitung, z.B. von Polypropylen/Polyamid 6 Blends, in-situ Phasenvermittler herzustellen. Durch Einbau von definierten Oligo(tetrafluoroethene) Segmenten in Kodensationspolymere werden neben thermischen und mechanischen Eigenschaften auch Oberflächenspannungen und Gasdurchlässigkeiten variiert.
    Notes: Tailor-made segmented polymers play a key role in the development of novel polymeric materials exhibiting unsual bulk and surface properties. As a function of molecular architectures of segmented polymers, it is possible to control polymer morphologies and to achieve property synergisms. Selected examples are presented to illustrate basic concepts and recent developments. Segmented reactive liquid rubbers, containing an immiscible silicone segment flanked by two miscible oligo(caprolactone) segments, are efficient epoxy toughening agents. In such nano-phase-separated silicone-modified IPNs impact strength is improved without sacrificing dimensional stability. Compatibilized blends of segmented phenolic polyurethane and nitrile liquid rubbers produce rubber blend microphases dispersed in epoxy prepregs which are used to bond aluminum sheets in structural laminates. Reactive blending technologies are developed to produce segmented polymers as blend compatibilizers during melt processing, e.g., of polypropylene/polyamide 6 blends. Incorporation of oligo(tetrafluoroethene) segments into various condensation polymers modifies thermal and mechanical properties as well as surface tension and gas permeabilities.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1994.052230104
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  • 3
    Electronic Resource
    Electronic Resource
    Organometallphosphin-substituierte Übergangsmetall-Komplexe, X. Organometallphosphin-tetracarbonyl-eisen-Komplexe (1970)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 103 (1970), S. 2350-2355 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Organometalphosphine Substituted Transition Metal Complexes, X. (Organometalphosphine)tetracarbonyliron ComplexesPentacarbonyliron reacts on u. v. irradiation with tri(tert-butyl)-, tris(trimethylsilyl)-, tris(tri-methylgermyl)-, and tris(trimethylstannyl)phosphine with displacement of one CO-ligand to give the corresponding tris[(triorganoelement-IVa)phosphine]tetracarbonyliron complexes. The same compounds can also be synthesized by elimination of pentacarbonyliron from enneacarbonyldiiron in the presence of the tris(triorganoelement-IVa)phosphines. The i. r., 1H n. m. r., and 31P n. m. r. spectroscopic data of the complexes are reported and discussed.
    Notes: Pentacarbonyleisen reagiert bei UV-Bestrahlung mit Tri(tert.-butyl)-, Tris(trimethylsilyl)-, Tris(trimethylgermyl)- bzw. Tris(trimethylstannyl)-phosphin unter Abspaltung eines CO-Liganden und Bildung entsprechender [Tris(triorganoelement-IVa)-phosphin]-tetracarbonyl-eisen-Komplexe. Dieselben Verbindungen entstehen auch unter Abspaltung von Pentacarbonyleisen aus Enneacarbonyldieisen und den genannten Tris(triorganoelement-IVa)-phosphinen. Die IR-, 1H-NMR- und 31P-NMR-spektroskopischen Daten der Komplexe werden mitgeteilt und diskutiert.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19701030806
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  • 4
    Electronic Resource
    Electronic Resource
    Organometallphosphin-substituierte Übergangsmetallkomplexe, VII. Organometallphosphin-tricarbonyl-nickel(0)-Komplexe (1970)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 103 (1970), S. 1383-1390 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Organometalphosphine-substituted Transition Metal Complexes, VII. Organometalphosphinetricarbonylnickel(0) ComplexesThe reaction of tetracarbonyl nickel with tri(tert-butyl)phosphine, tris(trimethylsilyl)-, tris(trimethylgermyl)-, tris(trimethylstannyl)-, and tris(trimethylplumbyl)phosphine as well as with trimethylstannyldiphenylphosphine, bis(trimethylstannyl)phenylphosphine, and bis(diphenylphosphino)phenylarsine results in the elimination of one CO-ligand and the formation of corresponding organometalphosphinetricarbonylnickel(0) complexes. The i.r., 1H n.m.r., and 31P n.m.r. spectra are reported and discussed.
    Notes: Tetracarbonylnickel reagiert mit Tri(tert.-butyl)-phosphin, Tris(trimethylsilyl)-, Tris(trimethylgermyl)-, Tris(trimethylstannyl)- und Tris(trimethylplumbyl)-phosphin sowie mit Trimethylstannyl-diphenyl-phosphin, Bis(trimethylstannyl)-phenyl-phosphin und Bis(diphenylphosphino)-phenyl-arsin unter Abspaltung eines CO-Liganden und Bildung entsprechender Organometallphosphin-tricarbonyl-nickel(0)-Komplexe. Die Infrarot-, 1H-NMR-und 31P-NMR-Spektren werden mitgeteilt und diskutiert.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19701030510
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  • 5
    Electronic Resource
    Electronic Resource
    Notiz zur Photolyse von Bicyclo[6.2.0]deca-2,4,6-trien (1977)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 110 (1977), S. 2394-2397 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19771100638
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  • 6
    Electronic Resource
    Electronic Resource
    Darstellung und Schwingungsspektren von Trimethylsilyl-, Trimethylgermyl- und Trimethylstannyl-tert-butylphosphinen (1974)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 854-868 
    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 Vibrational Spectra of Trimethylsilyl-, Trimethylgermyl-and Trimethylstannyl-tert-butylphosphinesTrimethylchlorosilane reacts with magnesium and di-tert-butylchlorophosphine, tert-butyl-dichlorophosphine, or PCl3 in tetrahydrofurane to form di tert-butyl(trimethylsilyl)phosphine, tert-butylbis(trimethylsilyl) phosphine, or tris(trimethylsilyl)phosphine respectively in high yields. By reaction between these organosilylphosphines and trimethylgermanim chloride or trimethyltin chloride the corresponding trimethylgermanium - or trimethyltin-phosphines are formed. The i.r., and Raman spectra are discussed.
    Notes: Trimethylchlorsilan reagiert mit Magnesium und Di-tert-butylchlorphosphin, tert- Butyl-dichlorphoshin oder PCl3 in Tetrahydrofuran unter Bildung von Di-tert-butyl(trimethylsilyl)phosphin, tert-Butylbis(trimethylsily)phosphin bzw. Tris(trimethylsilyl)phosphin in hohen Ausbeuten. Durch Umsetzung dieser Organosilylphosphine mit Trimethylgermaniumchlorid oder Trimethylzinnchlorid erhält man die entsprechenden Trimethylgermanium-bzw. Trimethylzinn-phosphine. Die Infrarot-und Raman-Spektren werden diskutiert.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19741070312
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  • 7
    Electronic Resource
    Electronic Resource
    Organometallphosphin-substituierte Übergangsmetallkomplexe, XVIII. Tricarbonyl(organometallphosphin)nickel(0)-Komplexe (1975)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 1630-1641 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Organometalphosphine-substituted Transition Metal Complexes, XVIII. Tricarbonyl(organometalphosphine)nickel(0) ComplexesThe reaction of tetracarbonyl nickel with tri(tert-butyl)phosphine (1), di(tert-butyl)trimethylsilyl-(2), -germyl- (3), -stannylphosphine (4), tert-butyl-bis(trimethylsilyl)- (5), -(germyl)- (6), -(stannyl)-phosphine (7) as well as with tris(trimethylsilyl)- (8), -(germyl)- (9) and -(stannyl)-phosphine (10) results in the elimination of one CO-ligand and the formation of corresponding tricarbonyl-(organophosphine)nickel(0) complexes 1a-10a. The i.r., raman, 1H n.m.r., and 31P n.m.r. spectra are reported and discussed.
    Notes: Tetracarbonylnickel reagiert mit Tri(tert-butyl)phosphin (1), Di(tert-butyl)trimethylsilyl- (2),-germyl- (3), -stannylphosphin (4), tert-Butyl-bis(trimethylsilyl)- (5), -(germyl)- (6), -(stannyl)phosphin (7) sowie mit Tris(trimethylsilyl)- (8), -(germyl)- (9) und -(stannyl)phosphin (10) unter Abspaltung eines CO-Liganden und Bildung entsprechender Tricarbonyl(organometallphosphin)nickel(0)-Komplexe 1a-10a. Die Infrarot-, Raman-, 1H-NMR- und 31P-NMR-Spektren werden mitgeteilt und diskutiert.
    Additional Material: 8 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19751080532
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  • 8
    Electronic Resource
    Electronic Resource
    Organometallphosphin-substituierte Übergangsmetallkomplexe, XIX. Tetracarbonyl(organometallphosphin)eisen-Komplexe (1975)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 2487-2499 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Organometalphosphine-substituted Transition Metal Complexes, XIX. Tetracarbonyl(organometalphosphine)iron ComplexesPentacarbonyliron reacts under u. v. irradiation with tri(tert-butyl)phosphine (1), di(tert-butyl)-trimethylsilyl-, -germyl- and -stannylphosphine (2-4), tert-butylbis(trimethylsilyl-, -germyl- and -stannyl)phosphine (5-7) as well as with tris(trimethylsilyl-, -germyl- and -stannyl)phosphine (8-10) with displacement of one CO-ligand and formation of the corresponding tetracarbonyl-(organometalphosphine)iron complexes 1a - 10a. The i. r., Raman, 1H n. m. r., and 31P n. m. r. spectra of the complexes are discussed.
    Notes: Pentacarbonyleisen reagiert bei UV-Bestrahlung mit Tri(tert-butyl)phosphin (1), Di(tert-butyl)-trimethylsilyl-, -germyl- bzw. -stannylphosphin (2-4), tert-Butybis(trimethylsilyl-, -germyl- bzw. -stannyl)phosphin (5-7) sowie mit Tris(trimethylsilyl-, -germyl- bzw. -stannyl)phosphin (8-10) unter Abspaltung eines CO-Liganden und Bildung entsprechender Tetracarbonyl(organometallphosphin)eisen(0)-Komplexe 1a - 10a. Die Infrarot-, Raman-, 1H-NMR- und 31P-NMR-Spektren werden diskutiert.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19751080802
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  • 9
    Electronic Resource
    Electronic Resource
    Eine einfache Synthese von Bis(trimethylsilyl)quecksilber (1979)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 112 (1979), S. 394-395 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A Simple Synthesis of Bis(trimethylsilyl)mercuryChlorotrimethylsilane reacts with mercury and aluminium in tetrahydrofuran with formation of bis(trimethylsilyl)mercury and other products. Bis(trimethylsilyl)mercury is easily isolated by sublimation from the reaction mixture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19791120137
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  • 10
    Electronic Resource
    Electronic Resource
    Notizen. Synthese und Eigenschaften von Lithium-tetrakis(trimethylsilyl)aluminat-Komplexen (1979)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 112 (1979), S. 3934-3938 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis and Properties of Lithium Tetrakis(trimethylsilyl)aluminate ComplexesChlorotrimethylsilane reacts with aluminium and lithium in ether in the presence of mercury to form lithium tetrakis(trimethylsilyl)aluminate, coordinated with diethyl ether, tetrahydrofurane, or dimethoxyethane. Unsolvated lithium tetrakis(trimethylsilyl)aluminate results by repeated sublimation of the ether adduct. The IR, Raman, and NMR spectra are discussed.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19791121217
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