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1979 (1)
1978 (2)
1Author    Bernd WrackmeyerRequires cookie*
 Title    Organoborierung von Alkinylstannanen, VI [1] Alienbildung bei einer Deorganoborierung Organoboration of Alkynylstannanes, VI [1] Formation of an Allene by Deorganoboration  
 Abstract    The thermal decomposition of some l,l-bis(trimethylstannyl)-2-dialkylborylalkenes leads unexpectedly to substituted allenes. The structural information is based on *H, 11 B, 13 C and 119 Sn NMR data and also on the strong IR band at 1882 cm" 1 . 
  Reference    Z. Naturforsch. 33b, 385—389 (1978); eingegangen am 18. Januar 1978 
  Published    1978 
  Keywords    Deorganoboration, Allenes, NMR 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0385.pdf 
 Identifier    ZNB-1978-33b-0385 
 Volume    33 
2Author    Wolfgang RungeRequires cookie*
 Title    The Molecular Structure of Allenes and Ketenes, XII [1] Four-Bond Proton-Proton Spin-Spin Couplings in Allenes  
 Abstract    Four-bond proton-proton coupling constants in allenes are reported. The substituent effects on the coupling constants are discussed on the basis of the dual-substituent parameter approach. Furthermore, the coupling constants are related to quantum-chemical indices (electron densities, overlap populations) obtained from semiempirical CNDO/S and ab initio STO-3G calculations. The magnitudes of the coupling constants depend upon the polar natures of the substituents as well as upon their charge-transfer abilities (resonance effects) to a com-parable amount. In general, the coupling constants in 1,3-disubstituted allenes are nonadditive in ligand -specific parameters. 
  Reference    Z. Naturforsch. 33b, 932—936 (1978); eingegangen am 18. Mai 1978 
  Published    1978 
  Keywords    Allenes, Proton-Proton Coupling Constants, Substituent Effects 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0932.pdf 
 Identifier    ZNB-1978-33b-0932 
 Volume    33 
3Author    Wolfgang RungeRequires cookie*
 Title    of Allenes and Ketenes, XIII [1] Correlations of Carbon-Proton Spin-Spin Coupling Constants in Allenes with ab initio ST0-3G Overlap Populations  
 Abstract    It is shown that substituent effects on one-bond and long-range carbon-proton coupling constants in monosubstituted allenes parallel quantitatively ab initio STO-3G carbon 2s-hydrogen 1 s overlap populations, irrespectively of whether the substituents are bonded to the allenic skeleton via first-row (C, O) or second-row (Si, S, CI) atoms. 
  Reference    (Z. Naturforsch. 34b, 118—120 [1979]; received September 26 1978) 
  Published    1979 
  Keywords    Allenes, Carbon-Hydrogen Coupling Constants, Substituent Effects 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0118_n.pdf 
 Identifier    ZNB-1979-34b-0118_n 
 Volume    34