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'n B NMR Spectra' in keywords Facet   Publication Year 1980  [X]
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1980[X]
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    Richard Goetze, Heinrich NöthRequires cookie*
 Title    Zur Kenntnis von 1.3.2-Dithiaborolen [2] Contributions to the Chemistry of Boron, 112 [1] 1,3,2-Dithiaboroles [2]  
 Abstract    Several methods were used to prepare a series of boron substituted 1,3,2-dithiaborols. The NMR data of this new class of compounds indicate in comparison to 1,3,2-dithia-borolanes, that the heterocycle can be looked at as a 6 jt-electron system. A high degree of analogy in the mass spectrometric fragmentation of dithiaborolanes and dithiaborols exists, however, the parent ion of 2-methyl dithiaborol is more stable than that of the saturated analogon. 
  Reference    Z. Naturforsch. 35b, 1212—1221 (1980); eingegangen am 30. Januar 1980 
  Published    1980 
  Keywords    1, 3, 2 -Dithiaboroles, n B NMR Spectra, 13 C NMR Spectra 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-1212.pdf 
 Identifier    ZNB-1980-35b-1212 
 Volume    35