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  • 11
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 2261-2268 
    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.
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  • 12
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 109 (1976), S. 237-245 
    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.
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  • 13
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 92 (1959), S. 1748-1755 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Δ1-Pyrrolin-N-oxyd wird durch Dehydrierung des aus N-Äthyl-pyrrolidin-N-oxyd erhältlichen N-Hydroxy-pyrrolidins monomer gewonnen. Umsetzungen dieses bisher einfachsten Nitrons mit Lithiumalanat, Phenylmagnesiumbromid und Phenylisocyanat werden beschrieben. Die Dehydrierung des 1-Hydroxy-2-phenyl-pyrrolidins mit Quecksilberoxyd führt zum 2-Phenyl-Δ1-pyrrolin-N-oxyd, im Gegensatz zum Verhalten des analogen Piperidinderivats, das zum 6-Phenyl-Δ1-piperidein-N-oxyd dehydriert wird. Das unterschiedliche Verhalten analoger Pyrrolidin- und Piperidinderivate wird aus der Stereochemie erklärt.
    Additional Material: 2 Ill.
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  • 14
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 95 (1962), S. 1470-1477 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Aus Lösungen von K2[Pd(CN)4] bzw. [Pd(CN)2·2NH3] n flüssigem Ammoniak werden kristalline, farblose, diamagnetische Barium-dicyanodialkinylpalladate(II), Ba[Pd(CN)2(C≡CH)2]0.75 NH3 und Ba[Pd(CN)2(C≡CC6H5)2]·1.5 NH3, dargestellt und chemisch sowie IR-spektroskopisch näher charakterisiert. Die Bildung dieser Verbindungen, auch aus dem Chelatkomplex [Pd(CN)2·en] (en = Äthylendiamin), beweist die cis-Konfiguration der Plan gebauten komplexen Anionen.  -  Durch Reduktion acetylidhaltiger Lösungen von K2[Pd(CN)4] bzw. [Pd(CN)2.2NH3] mit metallischem Kalium in flüssigem Ammoniak werden gelbe, kristalline, pyrophore, diamagnetische Kaliumdialkinylpalladate(0), K2Pd(C≡CR)2 (R = H, CH3, C6H5), erhalten.
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  • 15
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 95 (1962), S. 2073-2075 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Carbonsäure-imidazolide lassen sich mit Carbonsäuren zu Carbonsäureanhydriden umsetzen.
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  • 16
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 97 (1964), S. 3424-3429 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Metall-Halogen-Austauschreaktion zwischen Alkaliphosphiden MePR2 und Triphenylchlormethan in verschiedenen Lösungsmitteln sowie Darstellung und Eigenschaften tertiärer Phosphine des Typs R2P—C(C6H5)3 (R—C6H5, c-C6H11 und C2H5) werden beschrieben.
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  • 17
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 2091-2095 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Durch Verfütterung markierter Carbonsäuren werden neue Einblicke in die Biogenese der natürlich vorkommenden Acetylenverbindungen gewonnen. Es kann sichergestellt werden, daß in der Pflanze langkettige Carbonsäuren durch Dehydrierung und oxydativen Abbau in Dehydromatricariaester übergeführt werden. Die Ergebnisse machen früher diskutierte Möglichkeiten wahrscheinlich.
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  • 18
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 109 (1976), S. 3419-3425 
    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.
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  • 19
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Attempted Synthesis of Calicene from Trisubstitued Cyclopropanes and CyclopentenoneThe Li carbenoids 4, prepared by treatment of substituted 1,1-dihalocyclopropanes with BuLi, are reacted with cyclopent-2-enone under thermodynamic and kinetic control (Scheme 1). In general, the latter procedure gives better yields of cyclopropylcyclopentenols 5a-e, but the reaction seems to be controlled mainly by the steric and electronic properties of the substituent Y. So, with 4b and 4e, the main reaction is the attack of the carbenoid at C(1) of cyclopent-2-enone, while 4a (Y = PhS) predominantly deprotonates the ketone (Scheme 4). Whereas 5d and 5e can easily be converted to the dihydrocalicenes 6d and 6e (Scheme 6), the attempted elimination of H2O from 5a-c leads to the rearranged products 13-2 due to the opening of the cyclopropane ring (Scheme 5). Finally, the generation of the parent compound 2 from the silylated precursor 6d is attempted: treatment with MeO- gives the addition products 18A/18B, while the reaction with Br2 provides 19 by a bromination/dehydrobromination sequence (Scheme 7).
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  • 20
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 8-substituted xanthines 1-21 (including compound S 9795), caffeine (22), and the three isomeric dimethyl-xanthines 23-25 (see Table 1), were examined for their lipophilic behaviour using a reversed-phase HPLC technique. A number of flexible compounds showed a smaller-than-expected lipophilicity which based on conformational and tautomeric calculations were ascribed to the predominance of folded forms. A QSAR analysis of the phosphodiesterase-inhibitory potency of several compounds showed favourable factors to be a low lipophilicity and the absence of a substituent on the N7 position.
    Additional Material: 5 Ill.
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