Go toArchive
Browse byFacets
Bookbag ( 0 )
'U B NMR Spectra' in keywords Facet   Publication Year 1980  [X]
Results  2 Items
Sorted by   
Publication Year
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 
  Similar Items    Find
 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0439.pdf 
 Identifier    ZNB-1980-35b-0439 
 Volume    35 
2Author    Rosalinda Contreras, Bernd WrackmeyerRequires cookie*
 Title    Anwendung der 11 B-NMR-Spektroskopie zur Untersuchung von Hydroborierungen, II [1] Hydroborierung von 1.5-Cyclooctadien mit Boran in Tetrahydrofuran Application of n B NMR Spectroscopy to the Study of Hydroboration, II [1] Hydroboration of 1,5-Cyclooctadiene with Borane in Tetrahydrofurane  
 Abstract    The existence of various intermediates in the hydroboration of 1,5-cyclooctadiene with borane in tetrahydrofurane (BH3-THF) is revealed by n B NMR spectroscopy. The presence of the THF adduct of 9-borabicyclo[3,3,l]nonane in solutions of the dimer in THF is proved for the first time, and the importance of the adduct in accelerating exchange reactions shown by U B NMR spectroscopy. 
  Reference    Z. Naturforsch. 35b, 1236—1240 (1980); eingegangen am 13. Juni 1980 
  Published    1980 
  Keywords    Hydroboration, 9-Borabicyclo[3, 3, l]nonane, U B NMR Spectra 
  Similar Items    Find
 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-1236.pdf 
 Identifier    ZNB-1980-35b-1236 
 Volume    35