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1992 (1)
1991 (1)
1Author    Z. NaturforschRequires cookie*
 Title    Ringerweiterungs-und -Verengungsreaktionen bei BN-Vier-und -Sechsringen  
 Abstract    Expansion and C o n tractio n R eactions w ith BN F our-and Six-M em bered Rings Peter Paetzold3 *, J u tta K iesgena, K arl K ra h éa, H ans-U lrich M eiera und R oland Boeseb By the addition o f im inoboranes R B = N R ' (l a -d) to the corresponding diazadiboretidines (R B N R ')2 (2 a -d), a ring expansion is observed, borazines (R B N R ')3 (3 a -d) being formed. The particular im inoborane iP rB =N /P r (la) can be added to the diazadiboretidines 2 c -g to give borazines B3N 3R2R'2/Pr2 with an unsymmetrical set o f ligands. From P hB =N rB u (lj) and (PhBNzBu), (2j), the Dewar borazine 3j' is formed, which crystallizes in the space group P 2,lc. The diazadiboretidines 2 b -i , the borazines 3 b -d ,f , and the Dewar borazine 3e' are split into the corresponding iminoboranes R B =N rB u at 5 0 0 -6 0 0 °C in the gas phase. The molten bo­ razines 3 b —d ,f and Dewar borazines 3e', j' are contracted to the corresponding diazadiboreti­ dines 2 b -f , j at 1 6 0 -3 2 0 °C. [Ligands R/R': zPr/zPr (a), Me/zBu (b), Et//Bu (c), Pr/?Bu (d), zPr/ ?Bu (e), Bu/rBu (f), /Bu/zBu (g), /Bu/rBu (h), zBu(M e3Si)N/zBu (i), Ph//Bu (j).] 
  Reference    Z. Naturforsch. 46b, 853—8 (1991); eingegangen am 26. N ovem ber 1990 
  Published    1991 
  Keywords    Iminoboranes, Diazadiboretidines, Borazines, Ring Expansion, Ring Contraction 
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 TEI-XML for    default:Reihe_B/46/ZNB-1991-46b-0853.pdf 
 Identifier    ZNB-1991-46b-0853 
 Volume    46 
2Author    K. U. Rt, N. Iedenzu, Jo An, E. Serw, Atow Ska, Janusz Serw, Atow SkiRequires cookie*
 Title    Studies on l-Trimethylsilyl-2,4,6-triethylborazine and Related Species  
 Abstract    The unsymmetrically substituted borazine (C6H 5)3B3N 3H2[Si(CH3)3] has been obtained from the reaction o f C6H 5BC12 with HN [Si(C H 3)3]-,, and an improved synthesis o f (C2H 5)3B3N 3H 2[Si(CH3)3] has been developed. The reaction o f the latter with an excess o f BC13 proceeds with the ultimate formation o f Cl3B3N 3H 2[Si(CH3)3], whereas the reaction with one molar equivalent o f BBr3 leads to the formation o f Br(C2H5)2B3N 3H-,[Si(CH3)3], but which is contaminated by substantial am ounts o f Br(C2H 5)2B3N 3H3 besides a diborazinyl and additional products. C6H 5BBr2 reacts with N [Si(C H 3)3]3 to give the aminoborane [(CH3)3Si]2N BBr(C6H 5), but C6H5BC12 does not undergo a reaction under analogous condi­ tions. 
  Reference    Z. Naturforsch. 47b, 713—717 (1992); received September 12 1991 
  Published    1992 
  Keywords    Boron-Nitrogen Com pounds, Borazines, Unsymmetrically Substituted Borazines, Polyborazines 
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 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-0713.pdf 
 Identifier    ZNB-1992-47b-0713 
 Volume    47