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'13 C NMR Spectra' in keywords Facet   Publication Year 1980  [X]
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1980[X]
1Author    Bernd WrackmeyerRequires cookie*
 Title    Vergleich zwischen n B-und 13 C-chemischen Verschiebungen dreifach koordinierter Borverbindungen und Carbenium-Ionen Comparison between n B and 13 C Chemical Shifts of Three-Coordinate Boron Compounds and Carbenium Ions  
 Abstract    The relationship between U B chemical shifts (<5 n B) of trigonal boranes and 13 C® chemical shifts (<5 13 C®) of carbenium ions was found to be more complex than previously reported. The trends observed allow for the comparison of (pp) n bonding between boron and suitable substituents with the TT-charge derealization in carbenium ions. In case of the ferrocenyl boranes and ferrocenyl carbenium ions the markedly different trend in the shielding of 11 B and 13 C® favours a fulvene-like structure for the substituted cyclopenta-dienyl ring in the latter. Structural features are analogously reflected by <5 U B and d 13 C® data for both series of compounds. Comparison of <5 13 C data of organoboranes and carbe-nium ions can be useful in conformational studies. Einführung 
  Reference    Z. Naturforsch. 35b, 439—446 (1980); eingegangen am 5. November/14. Dezember 1979 
  Published    1980 
  Keywords    Boranes, Carbenium Ions, 13 C NMR Spectra, U B NMR Spectra 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0439.pdf 
 Identifier    ZNB-1980-35b-0439 
 Volume    35 
2Author    Richard Goetze, Heinrich NöthRequires cookie*
 Title    Zur Kenntnis von 1.3.2-Dithiaborolen [2] Contributions to the Chemistry of Boron, 112 [1] 1,3,2-Dithiaboroles [2]  
 Abstract    Several methods were used to prepare a series of boron substituted 1,3,2-dithiaborols. The NMR data of this new class of compounds indicate in comparison to 1,3,2-dithia-borolanes, that the heterocycle can be looked at as a 6 jt-electron system. A high degree of analogy in the mass spectrometric fragmentation of dithiaborolanes and dithiaborols exists, however, the parent ion of 2-methyl dithiaborol is more stable than that of the saturated analogon. 
  Reference    Z. Naturforsch. 35b, 1212—1221 (1980); eingegangen am 30. Januar 1980 
  Published    1980 
  Keywords    1, 3, 2 -Dithiaboroles, n B NMR Spectra, 13 C NMR Spectra 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-1212.pdf 
 Identifier    ZNB-1980-35b-1212 
 Volume    35 
3Author    ViqarUddin Ahmad, Q. Najmus-Saqib, K. Usmanghani, W. Fuchs, W. VoelterRequires cookie*
 Title    New Triterpenoid from Primula denticulata  
 Abstract    From the alcoholic extract of the plant Primula denticulata four main compounds could be isolated by column chromatography: Pri-dentigenin A, B, C and D. Several spectroscopic methods and the synthesis of several derivatives allow to determine the structure of Pridenti-genin B. 
  Reference    Z. Naturforsch. 35b, 511—512 (1980); eingegangen am 27. Dezember 1979 
  Published    1980 
  Keywords    Triterpenoids, Primula denticulata, Structure Elucidation, X H NMR Spectra, 13 C NMR Spectra 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0511_n.pdf 
 Identifier    ZNB-1980-35b-0511_n 
 Volume    35 
4Author    Rolf Appel, Ulrich BaumeisterRequires cookie*
 Title    Darstellung Diorganylamino-substituierter Carbodiphosphorane [1] Synthesis of Diorganylamino Substituted Carbodiphosphoranes [1]  
 Abstract    Aminolysis of the P-chlorofunctional carbodiphosphorane Ph3P = C = PPI12CI (1) affords the diorganylamino substituted phosphonium salts PI13P—CH—PPh2(NR2)] + Cl~ (3a-e, R = alkyl), which can be dehydrohalogenated in good yield by NaH to give the neutral compounds Ph3P = C — PPli2(NR2) (4a-e). The structure of the hitherto unknown amino-carbodiphosphoranes has been confirmed by 31 P{ 1 H} and 13 C{ 1 H} NMR data as well as by hydrolysis to give 5, hydrochlorination to 6b, e and methylation to 7 a, e. 
  Reference    Z. Naturforsch. 35b, 513—516 (1980); eingegangen am 7. Dezember 1979 
  Published    1980 
  Keywords    Carbodiphosphoranes, Diorganylamino Substitution, Base Reaction, 13 C NMR Spectra, 31 P NMR Spectra 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0513.pdf 
 Identifier    ZNB-1980-35b-0513 
 Volume    35 
5Author    R. Radeglia, S. L. Spassov, R. Stefanova, S. D. SimovaRequires cookie*
 Title    Verschiebungen in para-substituierten 3-Phenylpropan8äure-methylestern The Transmission of Substituent-Induced 13 C NMR Chemical Shifts in para-Substituted 3-Phenyl Propanoic Acid Methyl Esters  
 Abstract    Carbon-13 chemical shifts have been measured of joara-substituted 3-phenyl propanoic acid methyl esters. The substituent-induced 13 C shifts of the side chain were related to Hammett substituent effects by the dual substituent para-meter method. The transmission of substituent effects and the factors that influence 13 C shifts are discussed. 
  Reference    Z. Naturforsch. 35b, 934—936 (1980); eingegangen am 14. Januar 1980 
  Published    1980 
  Keywords    Dual Substituent Parameters, Polar and Steric Interactions, Conformational Energy, 13 C NMR Spectra 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0934_n.pdf 
 Identifier    ZNB-1980-35b-0934_n 
 Volume    35 
6Author    Gerhard Hägele, Detlef Wendisch, ++, Reiner Luckenbach, Hans-H BechtolsheimerRequires cookie*
 Title    Kernresonanzspektroskopische Untersuchungen an t-Butyl-phenyl-phosphinsäure-(—)-menthylester, II [1] 1 H-, 13 C-und 31 P-NMR-Analyse der absoluten Konfiguration am Phosphoratom NMR Spectroscopic Investigations on £-Butyl-phenyl-phosphinic Acid(—)-Menthyl Ester, II [1] 1 H, 13 C and 31 P NMR Analysis of Absolute Configuration at the Phosphorus Center  
  Reference    Z. Naturforsch. 35b, 1182—1190 (1980); eingegangen am 19. Mai 1980 
  Published    1980 
  Keywords    (—)-Menthol, Diastereomeric Menthylesters of Phosphinic Acids, 31 P NMR Spectra, 13 C NMR Spectra, Double Resonance 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-1182.pdf 
 Identifier    ZNB-1980-35b-1182 
 Volume    35 
7Author    Joachim Firl, Heinz Braun, Anton Amann, Robert BarnertRequires cookie*
 Title    und Bindungsverhältnisse von Enaminosulfoniumsalzen Dynamic Behaviour, Conformation and Bonding of Enaminosulfonium Salts  
 Abstract    The rotational barriers about the C-N single bond of the enaminosulfonium salts 1-6 are measured. Their magnitudes are related to the jr-donor strength of the NR2 group. For the unsymmetrically substituted compounds 7-12 the rotational equilibria are determined. In the case of the monoalkyl compounds 7-10 the more crowded s-cis-rotamers turn out to be the more stable conformations. Furthermore, the 13 C chemical shifts of the sulfonium salts 1-16 are reported. The shift differences ö(s-cis-s-trans) for the a-carbons of the N-alkyl groups seem to depend on the dihedral angle between the vinyl group and the C-H(°-c > bonds. Moreover, the spectra reveal that enaminosulfonium salts posses a high degree of ylide character. 
  Reference    Z. Naturforsch. 35b, 1406—1414 (1980); eingegangen am 20. Juni 1980 
  Published    1980 
  Keywords    Enaminosulfonium Salts, 13 C NMR Spectra, Rotational Barriers, Rotational Equilibria, Ylide Character 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-1406.pdf 
 Identifier    ZNB-1980-35b-1406 
 Volume    35