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  • 1980-1984  (8)
  • 1
    Electronic Resource
    Electronic Resource
    Dreikomponentenreaktionen. XVIXV. Mitt.: J. BEGER u. R. NEUMANN, J. prakt. Chem. 324, 1033 (1982) Zur Halogenierung von Alk-1-enen in Gegenwart von Ethylenoxid und Propylenoxid (1983)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 325 (1983), S. 719-728 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Three Component Reactions. XVI. Halogenation of Alk-1-enes in the Presence of Ethylene Oxide und Propylene OxideThe products of the chlorination of alk-1-enes in the presence of ethylene oxide and propylene oxide were investigated in relation to products of the chlorination in the presence of corresponding chloroalcohols 4 and 5. Isomers dominating in the Markovnikov orientation were found in all cases. Two of the three pairs of diastereomeric bischloropropylethers expected for the chlorination of propene in the presence of propylene oxide were identified by capillar GLC and 13C n.m.r. spectroscopy.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19833250506
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    13C-NMR-Spektren von 2-Bromcholest-5-en-3-onen (1984)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 273-278 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 13C-N.M.R. Spectroscopic Investigation of 2-Bromo-cholest-5-en-3-onesThe 13C-n.m.r. spectra of the 2-epimeric 2-bromocholest-5-en-3-ones have been measured and the substituent effects are determined. The substituent effects of 2-Br and Δ5 double bond follow the rules known from literature.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19843260212
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Beiträge zum Mechanismus der anionisch initiierten Acrylnitrilpolymerisation. II. Zur Ausbildung verzweigter Strukturen von im Strömungstrohr hergestellten AcrylinitrilpolymerenI: Acta Polymerica 32 (1981) 758-763. (1982)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 33 (1982), S. 626-631 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The acrylonitrile polymers obtained in a flow tube by using dimethylformamide/lithium-t-tutoxide as initiating system were characterized by light scattering. memberane osmometry, viscosimetry and 13C-NMR-spectroscopy. Long and short chain branchings were detected, the formation of which is explained by inter- and intramolecular proton transfer reactions of the α-C atom.
    Notes: Die im Strömungstrohr durch anionische Initiierung unter Verwendung des Systems Dimethylformamid/Lithium-tbutoxid hergestellten Acrylnitrilpolymere wurden durch Lichstreung, Membranosmometrie, Viskosimetrie und 13C-NMR-Spektroskopie charakterisiert. Es Liegen sowohl Lang-als auch kurzkettenverzweighte Strukturen vor, die durch eine inter-bzw. intramolekulare Protonen übertagungsreaktion vom α-C-Atom erklärt werden.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1982.010331102
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  • 4
    Electronic Resource
    Electronic Resource
    Nachweis von Verzweigungen in Polyacrylnitril mit der 13C-NMR-Spektroskopie (1982)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 33 (1982), S. 632-634 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: NMR-spectra of radically and anionically polymerized acrylonitrile indicate structural differences of the polymers obtained. Anionically polymerized samples have short chain branchings at the α-carbon atoms of the acrylonitrile monomer units. Branching degree and length of the nonbranched short chains can be determined by this method.
    Notes: Die NMR-Spektren von radikalisch und anionisch polymerisertem Acrylnitril weisen auf strukturelle Unterschiede hin. In anonisch hergestellten Proben sind Kurzkettenverzweigungen an den α-Kohlenstoffatomen nachweisbar. Verzweigungsgrad und Länge der unverzweiften kurzen Ketten können mit dieser Methode bestimmt werden.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1982.010331103
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  • 5
    Electronic Resource
    Electronic Resource
    13C-NMR-Spektroskopie von bromierten 3-Keto- und 3β-Acetoxy-5α-cholestan-Verbindungen (1983)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 325 (1983), S. 422-428 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 13C-NMR Spectroscopic Investigations of Brominated 3-Keto- and 3β-Acetoxy-5α-cholestane DerivativesThe chemical shifts of some brominated 3-keto- and 3β-acetoxy-5α-cholestane derivatives are determined. The substituent effects of bromine atoms on chemical shifts (SCS) and their additive behaviour, especially γ-SCS, are discussed.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19833250311
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    NMR-spektroskopische Untersuchungen an 15N-markierten geminal disubstituierten Cyclotriphosphazenen (1981)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 480 (1981), S. 163-170 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: NMR Spectroscopic Studies of 15N Labelled Geminally Disubstituted CyclotriphosphazenesIt is demonstrated by means of some selected 15N labelled geminally disubstituted cyclotriphosphazenes, 15N3P3X4Y2 (X = Cl; Y = F, NH2, or SEt), as an example, that the coupling constants 1JPN may be of different signs. The absolute value of 1JPN is significantly influenced only by those substituents, which are bonded to the phosphorus nucleus directly concerned in the coupling. Also the 15N chemical shifts are only changed by substituents on directly bonded phosphorus atoms.
    Notes: Am Beispiel ausgewählter 15N-markierter geminal disubstituierter Cyclotriphosphazene, 15N3P3X4Y2 (X = Cl; Y = F, NH2, SEt), wird gezeigt, daß die Kopplungskonstanten 1JPN unterschiedliche Vorzeichen haben können. Auf die Größe von 1JPN haben nur jeweils diejenigen Substituenten einen merklichen Einfluß, die an den direkt an der Kopplung beteiligten Phosphorkern gebunden sind. Die 15N-chemischen Verschiebungen werden ebenfalls nur durch die Substituenten an unmittelbar benachbarten Phosphoratomen beeinflußt.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19814800921
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  • 7
    Electronic Resource
    Electronic Resource
    NMR-spektroskopische Untersuchungen zur Solvatation von Tetraphenylimidodiphosphatokomplexen der Lanthanoiden (1983)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 496 (1983), S. 134-142 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: NMR-spectroscopic Investigations on Solvation of Lanthanoide Complexes of TetraphenylimidodiphosphateThe additional coordination of solvent molecules to chelate complexes LnA3 of rare earth ions (Ln3+) and tetraphenylimidodiphosphate ions (A-) has been studied by 1H-NMR spectroscopy. The nature of the solvent has a great influence on the spectra observed especially in the case of paramagnetic Ln3+ ions. In acetone as solvent TmA3 forms a disolvate preferably. The brutto stability constants for the additional coordination of acetone as ligands by TmA3 are β1 = (0.013 ± 0.003) mol-1 · l and β2 = (0.016 ± 0.001) mol-1 · l2.
    Notes: Die Anlagerung von Lösungsmittelmolekülen als weitere Liganden an Chelatkomplexe der Lanthanoiden (Ln3+) mit Tetraphenylimidodiphosphat-Ionen (A-) vom Typ LnA3 wurde mit Hilfe der 1H-NMR-Spektroskopie untersucht. Die Art des Lösungsmittels wirkt sich bei paramagnetischem Ln3+ drastisch auf die beobachteten Spektren aus. TmA3 bildet in Aceton bevorzugt ein Disolvat-Molekül. Die Bruttostabilitätskonstanten für die zusätzliche Aufnahme von Aceton als Liganden durch das TmA3 betragen β1 = 0,013 ± 0,003 mol-1 · l und β2 = 0,016 ± 0,001 mol-2 · l2.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19834960114
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  • 8
    Electronic Resource
    Electronic Resource
    Zur Nachweisbarkeit von Rotationsisomeren bei Trichlorphosphazen-N-phosphoryldichlorid mit Hilfe der NMR-Spektroskopie (1982)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 489 (1982), S. 126-130 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Remarks on the Evidence of Rotational Isomers in Trichlorophosphazene-N-phosphoryl-dichloride by Means of NMR SpectroscopyBy means of 31P NMR spectroscopy no rotational isomers of trichlorophosphazene-N-phosphoryldichloride are separately observable, neither in spectra of the neat compound at the immediate range of the melting temperature nor on low temperature experiments in dimethylether solution until a temperature of 158 K.
    Notes: Mit Hilfe der 31P-NMR-Spektroskopie lassen sich keine Rotationsisomere des Trichlorphosphazen-N-phosphoryldichlorids getrennt nachweisen, weder in reiner Substanz im unmittelbaren Bereich der Schmelztemperatur noch bei Tieftemperaturmessungen in Dimethylether bis zu einer Temperatur von 158 K.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19824890114
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