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  • 1
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 329 (1987), S. 349-354 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis of 3-Substituted 8(14)-Unsaturated 5β-Estranes
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 515 (1984), S. 173-181 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On Chalcogenolates. 141. Studies on Trimethylsilyl Xanthic Acid. 1. Synthesis and Properties of Trimethylsilyl XanthatesThe trimethylsilyl xanthates \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm M}\left[{{\rm S}_2 {\rm C} - {\rm OSi}\left({{\rm CH}_3} \right)_3} \right]\,{\rm mit\,M} = {\rm Li,Na,K},{\rm Rb},{\rm Cs} $$\end{document} have been prepared by reaction of the corresponding silanolate with carbon disulfide. The compounds were characterized by means of chemical and diverse spectroscopic methods.The existence of unstable trimethylsilyl xanthic acid has been demonstrated.
    Notes: Die Trimethylsilylxanthate \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm M}\left[{{\rm S}_2 {\rm C} - {\rm OSi}\left({{\rm CH}_3} \right)_3} \right]\,{\rm mit\,M} = {\rm Li,Na,K},{\rm Rb},{\rm Cs} $$\end{document} wurden durch Umsetzung des entsprechenden Silanolats mit Kohlenstoffdisulfid hergestellt und mit Hilfe chemischer und verschiedener spektroskopischer Methoden charakterisiert.Die Existenz der instabilen Trimethylsilylxanthogensäure konnte gesichert werden.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 515 (1984), S. 182-186 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On Chalcogenolates. 142. Studies on Trimethylsilyl Xanthic Acid. 2. S-Methyl and S-Ethyl Trimethylsilyl XanthatesThe hitherto unknown S-alkyl trimethylsilyl xanthates (CH3)3SiO—CS—SR, where R = CH3 and C2H5, have been characterized with electron absorption, infrared, nuclear magnetic resonance (1H, 13C, and 29Si), and mass spectra.
    Notes: Die bisher nicht bekannten S-Alkyltrimethylsilylxanthate (CH3)3SiO—CS—SR mit R = CH3 und C2H5 wurden mit Hilfe von Elektronenabsorptions-, Infrarot-, 1H-, 13C- und 29Si-NMR- und Massenspektren charakterisiert.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 323 (1981), S. 207-222 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Steroids. 66. 1H-N.M.R.-Investigations. Configurational Assignment of 15, 16, 17-Trisubstituted SteroidsThe 1H-n.m.r.-spectra of 15, 16, 17-trisubstituted estra-1,3,5(10)-trienes are discussed in view of the configurational assignment of the substituents. A reliable elucidation of their stereo-chemistry is possible on the basis of the coupling constants J16H,17H, J15H,16H and J14αH,15H. Additional parameters are the chemical shifts of the 15-, 16-, 17- and 18-protons (13β-methyl group) and the downfield shift of carbinol proton signals, caused by the reaction of hydroxyl groups with trichloroacetyl isocyanate. The chemical shifts of the 13β-methyl group can be calculated for compounds with trans configuration from substituent increments and for the other compounds by comparison with the chemical shifts of 16, 17-disubstituted compounds. The influence of different 16α-substituents on the chemical shifts of 15α- and 17α-protons is investigated. The downfield shifts of 15- and 17-proton signals due to the addition of trichloroacetyl isocyanate to 15, 17-diols depend on the configuration of the 16-substituents.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 66 (1994), S. 1199-1199 
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 445-454 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wird die Synthese von 6-Azido- und 6-Amino-17 α-acetoxy-progesteron und von 6-Azido- und 6-Amino-testosteronacetat beschrieben. Die Einführung der Stickstoffunktion kann durch Aufspaltung des entsprechenden Epoxides mit Natriumazid erfolgen. Die Aminoverbindungen werden aus den Azidoverbindungen durch Reduktion mit Hydrazinhydrat/Raney-Nickel erhalten.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 313 (1971), S. 83-98 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Kinetik der zu Benzoat-Ionen und Phosphorigsäurediäthylester führenden Spaltung der Phosphor-Kohlenstoff-Bindung von Aroylphosphonsäurediäthylestern läßt sich in Dioxan-Phosphatpuffer-Lösungen mittels einer spektralphotometrischen Meßmethodik verfolgen. Für p-Methylbenzoyl-, Benzoyl- und p-Chlorbenzoyl-phosphonsäurediäthylester 2a-c werden die Geschwindigkeitskonstanten und Aktivierungsparameter der P-C-Bindungsspaltung für unterschiedliche Mischungsverhältnisse des Lösungsmittelsystems im pH-Bereich 5 bis 8 bei Temperaturen zwischen 20° und 40° angegeben. Die pH- und Lösungsmittelabhängigkeit der Spaltungsgeschwindigkeit, der durch die HAMMETT-Beziehung beschreibbare Substituenteneinfluß auf die Geschwindigkeitskonstante, die Korrelation der k-Werte mit den polarographischen Halbstufenpotentialen der Reduktion von 2a-c sowie die UV-Spektren dieser Substrate werden diskutiert. Auf Grund des experimentellen Nachweises der allgemeinen Basenkatalyse in SÖRENSEN-Phosphatpuffer-Lösungen wird als geschwindigkeitsbestimmender Schritt der Spaltung die Lösung der P—C-Bindung, die die Deprotonierung eines Substrat-Wasser-Adduktes einschließt, vorgeschlagen.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 919-924 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Reaktion von 6,7α-Epoxy-17α-acetoxy-progesteron 1 mit Natriumazid in Äthylenglykolmonomethyläther führt zu 6β-Azido-7α-hydroxy-17α-acetoxy-progesteron 2a, das durch Säuren zu 6-Azido-17α-acetoxy-Δ4,6-pregnadien-dion-(3,20) 3 dehydratisiert wird. Durch Reduktion des Azidoalkohols 2a werden 6-Amino-Derivate des 17α-Acetoxy-progesterons erhalten.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 320 (1978), S. 291-302 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: On the Role of Charge-Transfer Complexes in Cationic Polymerization. IV. Investigation of Model Systems in SolutionFor the purpose of modelling the influence of donors on the cationic polymerization the complex formation between triphenylmethyl salts of the type (p-R—C6H4)3C+MtXn+1- and aromatic π-and n-donors was investigated. The position of the charge-transfer bands, the equilibrium constants as well as the enthalpies and entropies of complex formation were correlated with the acceptor strength of the cations resp. the basicity of the donors. The complex formation equilibrium was found to be strongly influenced not only by electronic but also steric effects. Strong π-donors like hexamethylbenzene and anthracene as well as n-donors like dialkylethers show a deviating behaviour.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Investigation of Solid Complexes of Triphenylmethyl Salts with DonorsTriphenylmethyl salts form crystalline complexes, which can be characterized by UV-VIS reflexion spectroscopy as well as by thermal methods. The stability of the solid complexes is essentially determined by the size of the substituents in the cation (p-R-C6H4)3C+ with R = CH3, H, Br and by that of the aromate (benzene, toluene, p-xylene, mesitylene). In constrat to the behaviour in solution a change of the anion (SbCl6-, FeCl4-) has a strong influence on the stability. Because of the appearance of a charge-transfer absorption the complexes are described as EDA complexes.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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