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1994 (1)
1987 (1)
1Author    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 
2Author    Michael Geschwentner, G. Ernot Elter, Anton MellerRequires cookie*
 Title    Supermesityl-substituierte Hydrazinoborane Supermesityl-Substituted Hydrazinoboranes  
 Abstract    Difluoro(supermesityl)borane reacts with monolithiated hydrazines to give the correspond­ ing fluoroborylated hydrazines la -c , which could not be dehydrofluorinated to yield definite products. From dilithiated hydrazine the 1,2-borylated species 2 was obtained. The fluoro-borylhydrazones 3 a-3 d prepared in an analogous way, by dehydrofluorination with tert-butyllithium, led to 5-, 6-and 7-membered boron nitrogen heterocycles depending upon the substituents of the hydrazones. 
  Reference    Z. Naturforsch. 49b, 459 (1994); eingegangen am 23. Januar 1994 
  Published    1994 
  Keywords    Hydrazine, Hydrazones, Difluoro(superm esityl)borane, Hydrazinoboranes, Boron-Nitrogen Heterocycles 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-0459.pdf 
 Identifier    ZNB-1994-49b-0459 
 Volume    49