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1997 (1)
1980 (2)
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    Rosalinda Contreras, Bernd WrackmeyerRequires cookie*
 Title    Anwendung der 11 B-NMR-Spektroskopie zur Untersuchung von Hydroborierungen, II [1] Hydroborierung von 1.5-Cyclooctadien mit Boran in Tetrahydrofuran Application of n B NMR Spectroscopy to the Study of Hydroboration, II [1] Hydroboration of 1,5-Cyclooctadiene with Borane in Tetrahydrofurane  
 Abstract    The existence of various intermediates in the hydroboration of 1,5-cyclooctadiene with borane in tetrahydrofurane (BH3-THF) is revealed by n B NMR spectroscopy. The presence of the THF adduct of 9-borabicyclo[3,3,l]nonane in solutions of the dimer in THF is proved for the first time, and the importance of the adduct in accelerating exchange reactions shown by U B NMR spectroscopy. 
  Reference    Z. Naturforsch. 35b, 1236—1240 (1980); eingegangen am 13. Juni 1980 
  Published    1980 
  Keywords    Hydroboration, 9-Borabicyclo[3, 3, l]nonane, U B NMR Spectra 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-1236.pdf 
 Identifier    ZNB-1980-35b-1236 
 Volume    35 
3Author    T. Deforth, M. Kaschke, H. Stock, H. Pritzkow, W. SiebertRequires cookie*
 Title    Synthesis of C2B3 X-Heterocycles (X = C, N, P, O, S) from l,3?5-Triborapentanes  
 Abstract    The hydroboration of acetylene with HBCb yields the products (CbB^CHM e (la), (Cl2BCHMe)2BCl (2a), (Cl2BCHMeBCl)2CHMe (3a), and (ClBCHMe)3 (4a). The crystal structure of 4a as well as of the pentaiodo derivative 2b were determined. A mechanism for the formation of the different hydroboration products is proposed. The 1,3,5-triborapentane 2a serves as precursor for the synthesis of derivatives of 1,3,5-triboracyclohexanes, 1,3,5-tribora-2-aza-cyclohexanes, l,3,5-tribora-2-phospha-cyclo-hexanes, and 1,3,5-tribora-2-thia-cyclohexanes. Their constitutions have been derived from spectroscopic studies. The crystal structure of the 1,3,5-tribora-2-oxa-cyclohexane derivative was also determined. 
  Reference    Z. Naturforsch. 52b, 823—830 (1997); received March 4 1997 
  Published    1997 
  Keywords    Hydroboration, 1, 3, 5-Triborapentanes, 1, 3, 5-Triboracyclohexanes, l, 3, 5-Tribora-2-oxa-cyclo-hexanes, 1, 3, 5-Tribora-2-aza-cyclohexanes 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-0823.pdf 
 Identifier    ZNB-1997-52b-0823 
 Volume    52