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1982 (1)
1980 (1)
1Author    Rosalinda Contreras, Bernd WrackmeyerRequires cookie*
 Title    Anwendung der 11 B-NMR-Spektroskopie zur Untersuchung von Hydroborierungen, I Hydroborierung von 3-Methyl-1.3-butadien mit Boran in Tetrahydrofuran und Dimethylsulfid Application of n B NMR Spectroscopy to the Study of Hydroboration, I Hydroboration of 3-Methyl-l,3-butadiene with Borane in Tetrahydrofurane and Dimethyl Sulfide  
 Abstract    The intermediacy of 3-methyl-l-boracyclopentane in the hydroboration of 3-methyl-1,3-butadiene with borane in tetrahydrofurane (BH3-THF) and dimethyl sulfide (BH3-DMS) has been established by means of n B NMR spectroscopy. The reaction proceeds through the trialkylborane stage (3:2 products) and the latter undergo exchange reactions with boron hydrogen compounds present. This has been proved independently by studying the n B NMR spectra of the mixtures between the 3:2 products and BH3-THF and BH3-DMS, respectively. Evidence is provided that opening of the boracyclopentane ring in exchange reactions is accompanied by exocyclic exchange. These results are further confirmed by the n B NMR spectra of the mixtures between l-phenyl-3-methyl-l-boracyclopentane and BH3-THF and BH3-DMS, respectively. U B NMR spectra of the 3:2 products dissolved in DMS allow evaluation of the isomer distribution. 
  Reference    Z. Naturforsch. 35b, 1229—1235 (1980); eingegangen am 13. Juni 1980 
  Published    1980 
  Keywords    Hydroboration, Exchange Reactions, n B NMR Spectra 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-1229.pdf 
 Identifier    ZNB-1980-35b-1229 
 Volume    35 
2Author    Bernd WrackmeyerRequires cookie*
 Title    Austauschreaktionen von Tri-/i -butylethinylstannan mit Zinntetrachlorid und Zinntetrabromid -Anwendung der 119 Sn-NMR Spektroskopie Exchange Reactions between Tri-n-butyl Ethynyl Stannane and Tintetrachloride and Tintetrabromide -Application of U9 Sn NMR Spectroscopy  
 Abstract    The formation of ethynyl stannanes Xra Sn(C = C-H)4 -n (X = Cl, Br; n — 0—3) via ex-change reactions between tri-n-butvl ethynyl stannane and SnX4 is readily monitored by 119 Sn NMR spectroscopy. Advantages of il9 Sn NMR as compared with iH or 13 C NMR are discussed. The 119 Sn and 13 C NMR parameters (<5 119 Sn, <5 13 C, W (119 Sn 13 C), WpCiH)) for these reaction mixtures are reported. Tri-n-butyl ethynyl stannane and bis(tri-n-butyl-stannyl)ethyne are both obtained from the reaction of tri-n-butylstannylchloride with L^Ca in hexane in the presence of excess ethyne. 
  Reference    Z. Naturforsch. 37b, 1524—1528 (1982); eingegangen am 7. Juli 1982 
  Published    1982 
  Keywords    Exchange Reactions, Ethynyl Stannanes, 119 Sn NMR Spectra, 13 C NMR Spectra 
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 TEI-XML for    default:Reihe_B/37/ZNB-1982-37b-1524.pdf 
 Identifier    ZNB-1982-37b-1524 
 Volume    37