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  • Chemistry  (61)
  • 1975-1979  (32)
  • 1945-1949  (7)
  • 1925-1929  (22)
  • 1
    Electronic Resource
    Electronic Resource
    Mikrobielle Eiweißgewinnung aus Kohlenwasserstoffen (1975)
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 9 (1975), S. 59-64 
    Details
    ISSN: 0009-2851
    Keywords: Chemistry ; Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ciuz.19750090205
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  • 2
    Electronic Resource
    Electronic Resource
    Redoxreaktionen zwischen Tri-tert-butylphosphin und Element(IVb)-tetrachloriden: Tri-tert-butylchlorphosphonium-Salze (1976)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 109 (1976), S. 3017-3024 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Redox Reactions between Tri-tert-butylphosphine and Element(IVb)-Tetrachlorides: Tri-tert-butylchlorophosphonium SaltsTri-tert-butylphosphine reacts with equimolare amounts of germaniumtetrachloride or tintetrachloride yielding new compounds with the formula (t-C4H9)3PMCl4 (M=Ge, Sn). The Comparison of n. m. r., infrared-, and raman spectra as well as the conductivities with the corresponding data of tri-tert-butyldichlorophosphorane, prepared, using tri-tert-butylphosphine and Chlorine, indicates, that all these compounds are tri-tert-butylchlorophosphine salts. Tri-tert-butyl-chlorophosphonium salts are also available, by the reaction of tri-tert-butyldichlorophosphorane with various element chlorides.
    Notes: Tri-tert-butylphosphin reagiert mit Germaniumtetrachlorid und Zinntetrachlorid im Molverhältnis 1:1 zu neuen Verbindungen der Zusammensetzung (t-C4H9)3PMCl4 (M=Ge, Sn). Der Vergleich von Kernresonanz- und Schwingungsspektren sowie von Leitfähigkeiten mit den entsprechenden Daten von Tri-tert-butyldichlorphosphoran, das aus Tri-tert-butylphosphin mit elementarem Chlor erhalten wurde, zeigt, daß die Verbindungen als Tri-tert-butylchlor-phosphonium-Salze vorliegen. Weitere Verbindungen dieses Typs sind aus Tri-tert-butyldichlor-phosphoran mit verschiedenen Elementchloriden zugänglich.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19761090906
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  • 3
    Electronic Resource
    Electronic Resource
    Reaktionen an komplexgebundenen Carbenanalogen, II: Synthese und Schwingungsspektren von Pentacarbonyl[chlor-(di-tert-butylphosphino)stannylen]metall(VI A)-Komplexen (1978)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 111 (1978), S. 2267-2272 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions of Complex-bound Carbene Analogues, II: Synthesis and Vibrational Spectra of Pentacarbonyl[chloro(di-tert-butylphosphino)stannio]-metal(VI A) ComplexesThe tindichloride complexes pentacarbonyl(dichlorotetrahydrofurane-stannio)chromium(0) (1), -molybdenum(0) (2) and -tungsten(0) (3) react with di-tert-butyl(trimethylsilyl)phosphine with elimination of tetrahydrofurane and formation of chlorotrimethylsilane to give the new, base free stannio complexes (CO)5M—Sn(Cl)[P(tBu)2] (4-6: M = Cr, Mo, W) with 75 to 85% yield. The ligand properties of chloro(di-tert-butylphosphino)-stannandiyl (-stannylene) are discussed on the basis of infrared and Raman data, and other physical properties.
    Notes: Die SnCl2-Metallkomplexe Pentacarbonyl(dichlortetrahydrofuran-stannio)chrom(0) (1), -molybdän(0) (2) und -wolfram(0) (3) reagieren mit Di-tert-butyl(trimethylsilyl)phosphin unter Verdrängung von Tetrahydrofuran und Eliminierung von Chlortrimethylsilan, wobei die neuen basenfreien Stannylenkomplexe (CO)5M—Sn(Cl)[P(tBu)2] (4-6: M = Cr, Mo, W) in 75-85 proz. Ausbeute erhalten werden. Die Ligandeneigenschaften von Chlor(di-tert-butylphosphio)stanandiyl (-stannylen) werden anhand von IR- und Raman-Daten sowie der physikalischen Eigenschaften von Ligand und Komplexen diskutiert.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19781110621
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  • 4
    Electronic Resource
    Electronic Resource
    Chlor(organogermyl)phosphine (1975)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 2261-2268 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Chlor(organogermyl)phosphineDi-tert-butyl(trimethylsilyl)phosphine reacts with dichlorodimethylgermane, trichloromethylgermane, and germanium tetrachloride to form di-tert-butyl(chlorodimethylgermyl)phosphine (5), di-tert-butyl(dichloromethylgermyl)phosphine (6), and di-tert-butyl(trichlorogermyl)phosphine (7) in high yields. Similarly diphenyl(trimethylsilyl)phosphine and tris(trimethylsilyl)phosphine react with dichlorodimethylgermane to yield new (chlorodimethylgermyl)phosphines (3,8). The vibrational and n.m.r. spectra of the new compounds are discussed.
    Notes: Di-tert-butyl(trimethylsilyl)phosphin reagiert mit Dichlordimethylgerman, Trichlormethylgerman und Germaniumtetrachlorid in hohen Ausbeuten zu Di-tert-butyl(chlordimethylgermyl)phosphin(5), Di-tert-butyl(dichlormethylgermyl)phosphin (6) und Di-tert-butyl(trichlorgermyl)phosphin (7). Entsprechend reagieren Diphenyl(trimethylsilyl)phosphin und Tris(trimethylsilyl)phosphin mit Dichlordimethylgerman zu neuen (Chlordimethylgermyl)phosphinen (3,8). Schwingungsspektren und Kernresonanzspektren der neuen Verbindungen werden diskutiert.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19751080713
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  • 5
    Electronic Resource
    Electronic Resource
    Organo[chlor(methyl)stannyl]phosphine und -amine (1976)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 109 (1976), S. 237-245 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Organo[chloro(methyl)stannyl]phosphines and -aminesEquimolar amounts of di-tert-butyl(trimethylsily)phosphine (1) and dichlorodimethylstannane or trichloro(methyl)stannane react with formation of di-tert-butyl(chlorodimethylstannyl)phosphine (2) and di-tert-butyl[dichloro(methyl)stannyl]phosphine (3), respectively. The reaction of 1 with trichloro(methyl)stannane in a molar ratio of 2:1 yields chloro(methyl)stannanediylbis(di-tert-butylphosphine)(4). All experiments to synthesize he analogous (chlorodimethylstannyl)diphenyl-phosphine failed. A new method for the synthesis of (chlorodimethylstannyl)diethylamine (6) and (bromodimethylstannyl)diethylamine (7) was found with the reaction of bis(diethylamino)dimethylstannane with chloro- and bromotrimethylsilane, respectively. The i. r. and 1H n.m.r. spectra are discussed.
    Notes: Äquimolare Mengen von Di-tert-butyl(trimethylsilyl)phosphin (1) und Dichlordimethylstannan bzw. Trichlor(methyl)stannan reagieren unter Bildung von Di-tert-butyl(chlordimethylstannyl)-phosphin (2) und Di-tert-butyl[dichlor(methyl)stannyl]phosphin (3). Die Umsetzung von 1 mit Trichlor(methyl)stannan im Molverhältnis 2:1 führt glatt zu Chlor(methyl)stannandiylbis(di-tert-butylphosphin) (4). Die Versuche, ein entsprechendes (Chlordimethylstanny)diphenyl-phosphin zu synthetisieren, schlugen dagegen fehl. Diäthyl(chlordimethylstannyl)amin (6) und Diäthyl(bromdimethylstannyl)amin (7) werden durch Spaltung von Bis(diäthylamino)dimethylstannan mit Chlor- bzw. Bromtrimethylsilan dargestellt. IR- und NMR-Spektren werden diskutiert.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19761090123
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  • 6
    Electronic Resource
    Electronic Resource
    Triorganophosphin-dichlorgermylene (1976)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 109 (1976), S. 3419-3425 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Triorganophospine-dichlorogermylenesTriphenylphosphine, triethylphosphine and tri-tert-butylphosphine react with equimolar amounts of germaniumdichloride.dioxane yielding triorganylphosphine-dichlorogermylenes R3PGeCl2 (R=C2H5, C6H5, t-C4H9). With tri-n-butylphosphine only a mixture of dioxane-stabilized and phosphine-stabilized GeCl2 was obtained. Formation and properties as well as n. m. r., infrared and raman spectra of the new compounds are discussed.
    Notes: Triphenylphosphin, Triäthylphosphin und Tri-tert-butylphosphin reagieren mit dem Germanium-dichlorid-Dioxan-Komplex unter Verdrängung von Dioxan zu den Triorganylphosphin-dichlorgermylenen R3PGeCl2 (R=C2H5, C6H5, t-C4H9). Mit Tri-n-butylphosphin wird lediglich ein Gemisch von dioxanstabilisiertem und phosphinstabilisiertem GeCl2 erhalten. Bildungsweise und Eigenschaften sowie 1H-NMR-, 31P-NMR-, infrarot- und ramanspektroskopische Daten der Verbindungen werden diskutiert.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19761091019
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  • 7
    Electronic Resource
    Electronic Resource
    Pentacarbonyl[di-tert-butyl(chlordimethylgermyl- und -stannyl)phosphin]chrom(0), -molybdän(0) und -wolfram(0) (1976)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 109 (1976), S. 246-252 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Pentacarbonyl[di-tert-butyl(chlorodimethylgermyl- and -stannyl)phosphine]chromium(0), -molybdenum(0) and -tungsten(0)Di-tert-butyl(chlorodimethylgermyl)phosphine (1) and di-tert-butyl(chlorodimethylstannyl)phosphine (2) react with pentacarbonyl(tetrahydrofurane(chromium(0),-molybdenum(0) and -tungsten- (0) to form the corresponding pentacabonyl[di-tert-butyl(chlorodimethylgermyl- and -stannyl)- phosphine]-metal(0) complexes 3a-c and 4a-c, respectively. The vibrational- and nuclear magnetic resonance spectra are discussed.
    Notes: Di-tert-butyl(chlordimethylgermyl)phosphin (1) bzw. Di-tert-butyl(chlordimethylstannyl)phosphin (2) reagieren mit Pentacarbonyl(tetrahydrofuran)chrom(0), -molybdän(0)und -wolfram(0)unter Bildung der entsprechenden Pentacarbonyl[di-tert-butyl(chlordimethylgermyl- bzw. -stannyl)phosphin]-metall(0)-Komplexe 3a-c bzw. 4a-c. Die Schwingungs- und Kernresonanzspektren werden diskutiert.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19761090124
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  • 8
    Electronic Resource
    Electronic Resource
    Substitutionsreaktionen an Di-tert-butyl(chlordimethylstannyl bzw. germyl)phosphin (1976)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 109 (1976), S. 1017-1022 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Substitution reactions at Di-tert-butyl(chlorodimethylstannyl)phosphine and Di-tert-butyl(chlorodimethylgermyl)phosphineDi-tert-butyl(chlorodimethylstannyl)phosphine (2) reacts with di-tert-butyl(trimethylsilyl) phoshine (1) or sodium trimethylsilanolate to form dimethylstannanediylbis(di-tert-butylphosphine) (4) or di-tert-butyl[dimethyl(trimethylsiloxy)stannyl]phosphine (7), respectively, In contrast the analogous di-tert-butyl(chlorodimethylgermyl)phosphine (6) does not react with 1 but only with sodium trimethylsilanolate yielding di-tert-butyl[dimethyl(trimethylsiloxy)germyl]phosphine (8). The vibrational and n. m. r. spectra of the new compounds are discussed.
    Notes: Di-tert-butyl(chlordimethylstannyl)phosphin (2) reagiert mit Di-tert-butyl(trimethylsilyl)phosphin (1) zu dimethylstannandiylbis(di-tert-butylphosphin) (4), mit Natrium-trimethylsilanolat zu Di-tert-butyl[dimethyl(trimethylsiloxy)stannyl]phosphin (7). Di-tert-butyl(chlordimethylgermyl)phosphin (6) reagiert dagegen nicht mit 1, bildet aber bei der Umsetzung mit Natrium-trimethylsilanolat Di-tert-butyl[dimethyl(trimethylsiloxy)germyl]phosphin (8) Die Schwingungs- und Kernresonanzspektren der neuen Verbindungen werden diskutiert.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19761090322
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  • 9
    Electronic Resource
    Electronic Resource
    Branching in free radical polymerization due to chain transfer. Application to poly(vinyl acetate) (1976)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 177 (1976), S. 2519-2538 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es wird eine allgemeine statistische Theorie der radikalischen Polymerisation mit Kettenübertragung entwickelt, die in direktem Zusammenhang mit der Polymerisationskinetik steht. Die vorliegende Arbeit befaßt sich im einzelnen mit dieser Beziehung; es werden analytische Ausdrücke für die Reaktionswahrscheinlichkeiten als Funktion der Reaktionsgeschwindigkeiten und des Monomerumsatzes abgeleitet. Die statistische Behandlung (Kaskadentheorie) der Polyreaktion erlaubt die Berechnung des Gewichtsmittels des Polymerisationsgrads Pw, des z-Mittels des mittleren Trägheitsradiusquadrats 〈S2〉z und des Streuformfaktors Pz(θ). Während für lineare Ketten die erwähnten Mittelwerte durch eine einzige Verknüpfungswahrscheinlichkeit festgelegt sind, sind die entsprechenden Mittelwerte bei dem verzweigten System durch eine stochastische Matrix bestimmt, deren Elemente die verschiedenen Verknüpfungswahrscheinlichkeiten sind. Die Theorie +ird auf Polyvinylacetat angewendet. Es wird eine gute Übereinstimmung mit den experimentellen Ergebnissen von D. J. Stein für dieses Polymere erhalten.
    Notes: A general statistical theory in direct relation to the kinetics of polymerization is developed for free radical polymerization with chain transfer. In the present paper this relationship is displayed in detail; analytical expressions are derived for the probabilities of reaction as functions of the reaction rates and the monomer conversion. The statistical treatment (cascade theory) of the polyreaction allows the calculation of the weight average degree of polymerization Pw, the z-average mean square radius of gyration 〈S2〉z, and the particle scattering factor Pz(θ). While for linear chains the mentioned averages are determined by a single link probability, in the branched system these averages are characterized by a stochastic matrix whose elements are the various link probabilities. The theory is applied to poly(vinyl acetate). A good agreement is obtained with the experimental results of D. J. Stein for this polymer.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1976.021770821
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  • 10
    Electronic Resource
    Electronic Resource
    Branching in free radical polymerization due to chain transfer, 2.Part 1: cf.12.Dedicated to Professor Manfred Gordon on the occasion of his 60th birthday. Theory of the effect of polyfunctional transfer reagents (1977)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 178 (1977), S. 1403-1426 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Polyfunctional chain transfer reagents applied in free radical polymerization have two effects on the polymer molecular weight. As in the case of monofunctional regulators the chain length is reduced; the polyfunctionality of the transfer reagents causes, however, branching and thus an increase in molecular weight. A general theory is developed on the basis of Cascade Theory to describe the polymer structure in dependence on the monomer conversion. The theory takes advantage of the graph theoretical concept of digraphs by which the directed chain reaction can be properly represented. Analytic equations are derived for the weight average molecular weight Mw, z-average mean square radius of gyration 〈S2〉z and the average particle scattering factor Pz(μ). Furthermore, a simple equation is given for the condition of gelation. Special concern is given to the formation of fractions of branched and linear polymers during the polymerization process. The derived equations are discussed in terms of kinetic constants known for polystyrene. Gelation is shown to be possible for a chain transfer constant of Ctr = 22 if the number of functional groups per transfer molecule exceeds at least a value of 7.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1977.021780516
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