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1980 (1)
1975 (1)
1Author    Requires cookie*
 Title    Reaktionskinetische Untersuchungen zur Bildung von Carbeniumionen des Triphenylmethyl-Typs K inetic Investigations of the Form ation of Carbenium Ions of the Triphenylmethyl Type  
 Abstract    M a t t h i a s W a l p e r , H a n s -D i e t e r B r a u e r u n d H a r t w ig K e l m The rates of formation of three mono-and three dicarbenium ions of the triphenyl m ethyl type from the corresponding carbinols in trifluoro acetic acid -toluene mixtures were investigated using stopped flow techniques. The reaction mechanisms are discussed in view of the obtained dependencies of the rate constants on acid concentration and temperature. 
  Reference    (Z. Naturforsch. 30b, 561—565 [1975]; eingegangen am 12. Mai 1975) 
  Published    1975 
  Keywords    Carbenium Ions, Triphenylmethyl Ions, Kinetics 
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 TEI-XML for    default:Reihe_B/30/ZNB-1975-30b-0561.pdf 
 Identifier    ZNB-1975-30b-0561 
 Volume    30 
2Author    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