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  • Analytical Chemistry and Spectroscopy  (346)
  • 1990-1994
  • 1970-1974  (346)
  • 1970  (346)
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Publisher
Years
  • 1990-1994
  • 1970-1974  (346)
Year
  • 1
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 2 (1970) 
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 2 (1970), S. 431-438 
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The proton magnetic resonance spectra of 1,4-benzodithiin and 1,4-benzodioxin have been fully analyzed. The effects of the substituent heteroatoms on the chemical shifts of the various protons in the two molecules have been discussed.
    Additional Material: 3 Ill.
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  • 4
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: In the course of configurational and conformational investigations on substituted cyclohexanes, 220 MHz spectra of di- and tri- substituted derivatives were obtained. In many cases the higher frequency permits detailed assignments of all ring protons. Special features of the spectra are discussed.
    Notes: Im Zuge der Konfigurations- und Konformationsuntersuchungen an substituierten Cyclohexanen wurden 220 MHz-Spektren von di- und trisubstituierten Verbindungen gemessen. In vielen Fällen gestattet die höhere Frequenz eine weitgehende Zuordnung aller Ringprotonen. Spezielle Eigenheiten der Spektren werden diskutiert.
    Additional Material: 6 Tab.
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  • 5
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 2 (1970), S. 457-465 
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cellulose derivatives are used as examples to show how NMR spectroscopy - at 100 and particularly at 220 MHz - may be applied in structural studies of polysaccharides, namely to distinguish between hexoses and pentoses, to determine the configuration and conformation of the monomer units in the polymer as well as the type of the glycosidic bond. For such investigations the acetyl, benzoyl or methyl derivatives are required. The degree of polymerization (Pw) of the acetates or methyl ethers should be Pw 〈 200 and in the case of benzoates Pw 〈 100.
    Notes: Am Beispiel der Cellulosederivate wurde gezeigt, wie es mit Hilfe der PR-Spektroskopie - speziell bei einer Meßfrequenz von 220 MHz - möglich ist, in Polysacchariden zwischen einer Hexose und Pentose zu unterscheiden, die Konfiguration und die Konformation des Monomerbausteins im Polymeren sowie die Art der glycosidischen Bindung zu bestimmen. Voraussetzung für diese Untersuchungen sind die Acetyl-, Benzoyl- oder Methylderivate des Polysaccharids, wobei der Polymerisationsgrad bei den Acetaten und den Methyläthern Pw 〈 200, bei den Benzoaten sogar Pw 〈 100 sein sollte.
    Additional Material: 2 Ill.
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  • 6
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 2 (1970), S. 581-604 
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 13C NMR absorption spectra of 50 bicyclic hydrocarbons, alcohols and ketones have been measured, in addition to some terpenes. The 13C chemical shifts are approximately additive for similar compounds and can be used for the determination of molecular structure; they differ for endo- and exo-isomers, just as in proton spectra. These quite regular and predictable 13C shift differences are much larger and are caused by the 1,4-nonbonded interaction between atoms heavier than hydrogen, not by magnetic anisotropy effects.
    Additional Material: 2 Ill.
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  • 7
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 2 (1970), S. 605-611 
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The treatment of nitromethane or dinitromethane in aqueous alkaline solutions (1 to 2·5 M hydroxide) with nitrogen dioxide yields the dianion radical of dinitronitrosomethane [C(NO2)2(NO)\documentclass{article}\pagestyle{empty}\begin{document}$ \buildrel\textstyle.\over= $\end{document}] which at 30° has hfsc of aNNO2 = 10·75 and 0·65 and aNNO = 5·80 g. Restricted rotation about the C—NO bond causes magnetic non-equivalence of the two nitro groups which can slowly exchange giving rise to line broadening. The use of 15N labeled nitrogen dioxide gave the dianion radical \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm [C(}^{{\rm 15}} {\rm NO}_{\rm 2} {\rm)(}^{{\rm 14}} {\rm NO}_{\rm 2} {\rm)(}^{{\rm 15}} {\rm NO)} \buildrel\textstyle.\over= {\rm]} $$\end{document} which exists in two equally populated conformations, each of which shows the expected line broadening for a ‘slow exchange’ process in which the nitro groups are being interconverted.
    Additional Material: 5 Ill.
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  • 8
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 2 (1970), S. 619-624 
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: NMR parameters for three 3-aza-bicyclo [3.1.0]hexanes are reported, which have been determined from the 100 and 220 MHz spectra, using methods of partial analysis and iterative computer calculations, respectively. A brief discussion of the parameters obtained, with respect to the structure of the 3-aza-bicyclo[3.1.0]hexane system, is given.
    Notes: Es werden die kernresonanzspektroskopischen Parameter von drei 3-Aza-bicyclo[3.1.0]hexanen mitgeteilt, die aus den 100- und 220 MHz- Spektren durch Teilanalyse bzw. Durch iterative Computerberechnungen ermittelt wurden. Eine kurze Diskussion der erhaltenen Parameter in Hinblick auf die Struktur des 3-Aza-bicyclo[3 1.0]hexan-Systems schließt sich an.
    Additional Material: 1 Tab.
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  • 9
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 2 (1970), S. 625-627 
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 2 (1970), S. 1-6 
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: When as many as four vicinal couplings occur between four protons situated on three carbon atoms of a cyclobutane ring, one can employ the Karplus relation to assign the configuration of substituents at the remaining positions and make some inferences about the stereochemistry. Four examples are described; the spectra and data are analyzed.
    Additional Material: 2 Ill.
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