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1987 (1)
1983 (1)
1Author    Angelika Sebald, Bernd Wrackmeyer, Wolfgang BeckRequires cookie*
 Title    Kernresonanzspektroskopische Untersuchungen OH-, 13 C-, 31 P-, 195 Pt-NMR) an Alkinyl-Komplexen von Pt n , Pd n und Ni" Nuclear Magnetic Resonance ^H-, 13 C-, 31 P-, 195 Pt-NMR)-Studies of Alkynyl Derivatives of Pt 11 , Pd 11 and Ni 11  
 Abstract    The NMR parameters (X H, 13 C, 31 P, 195 Pt) of compounds of the type eis-and trans-[M(C=C-R)2(PR'3)2] (M = Ni, Pd, Pt) are reported. The chemical shifts <5 13 C (M-C=C; R) and <5 195 Pt (together with UV data) indicate the presence of jz-backbonding from the metal into the orbitals. This also explains some unusual features of the coupling constants J(= 13 C 1 H), J(i 3 C= 13 C) and J(195 Pt 13 C=). The NMR parameters reflect an increase in the amount of yr-backbonding for Pt < Pd < Ni. 
  Reference    (Z. Naturforsch. 38b, 45—56 [1983]; eingegangen am 1. Oktober 1982) 
  Published    1983 
  Keywords    Alkynyl Ptn, Pdn-, Nin-complexes, Multinuclear NMR 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0045.pdf 
 Identifier    ZNB-1983-38b-0045 
 Volume    38 
2Author    Roland Köster, Günther Seidel, Susanna Kerschl, Bernd WrackmeyerRequires cookie*
 Title    Atropisomerism in Boron-Nitrogen Heterocycles  
 Abstract    Atropisomerism owing to hindered rotation about the N-aryl bond is observed in 4,5-diethyl-2,2,3-trimethyl-l-(o-trifluormethyl)phenyl-2,5-dihydro-lH-l,2,5-azasila-(2) and -azastanna-boroles (5). The compounds 2 and 5 are characterized by elemental analysis, mass spectra and 'H, "B, 13 C, 29 Si and U9 Sn NMR. The orr/zo-trifluoromethyl group serves as an additional NMR spectroscopic probe because of "through space" W F-'H and 19 F-L, C spin spin coupling. Compound 5 is the first derivative of a 2,5-dihydro-lH-l,2,5-azastannaborol. 
  Reference    Z. Naturforsch. 42b, 191—194 (1987); eingegangen am 23. Oktober 1986 
  Published    1987 
  Keywords    Atropisomerism, Boron-Nitrogen Heterocycles, Multinuclear NMR 
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 TEI-XML for    default:Reihe_B/42/ZNB-1987-42b-0191.pdf 
 Identifier    ZNB-1987-42b-0191 
 Volume    42