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'Boron' in keywords Facet   Publication Year 1999  [X]
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1999[X]
1Author    Lothar Weber, Eckhard Dobbert, Andreas Rausch, Hans-Georg Stammler, Beate NeumannRequires cookie*
 Title    Synthesis, Structure and Reactivity of 2-Amino-and 2-Imino-2,3-dihydro-1H -1,3,2-diazaboroles  
 Abstract    The 2-halo-2,3-dihydro-1H-1,3,2-diazaboroles RN-CH=CH-N(R)BX (la': R = rBu, X = Br; lb: R = 2,6-Me2C6H.v, X = I) were converted into the 2-amino-2,3-dihydro-\H -1,3,2-diazaboroles RN-CH=CH-N(R)B-NH2 (2a: R = /Bu; 2b: 2,6-Me2C6H3) by treatment with dry gaseous ammonia. Similarly reaction of la' with 2,6-dimethylaniline or /BuNHt afforded the corresponding derivates /BuN-CH=CH-N(rBu)BNHR' (3; R 1 = 2,6-Me2C6H3; 4; R1 = rBu). The treatment of la' with the ethylene diamine adduct of lithium acetylide led to the formation of [rBuN-CH=CH-N(/Bu)BN(H)CH2]2 (5). Lithiation of 2 a and subsequent silylation gave 6 (R1 = SiMe3), which was transformed to the diborolylamine [/BuN-CH=CH-N(rBu)B]2NH (7) upon exposure to la'. Borolylketimine /BuN-CH=CH-N(/Bu)B-N=CPh2 (8) and borolylcar-bodiimide fBuN-CH=CHN(/Bu)B-N=C=N-SiMe3 (9) resulted from la' and Ph2C=NSiMe3 or Me3SiN=C=NSiMe3, respectively. All the new compounds were characterized by elemental analyses as well as spectroscopic data (IR, 'H, n B, i3C NMR, MS). Heterocycle 5 was also subjected to an X-ray diffraction analysis. 
  Reference    Z. Naturforsch. 54b, 363—371 (1999); eingegangen am 25. September 1998 
  Published    1999 
  Keywords    Boron, Diazaboroles, Amines, Imines 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-0363.pdf 
 Identifier    ZNB-1999-54b-0363 
 Volume    54 
2Author    Insan Boya, Rüdiger KniepaRequires cookie*
 Title    K[B6PO10(OH)4]: Ein Borophosphat mit gestreckten Bändern aus Tetraeder-Vierer-Ringen und offen-zyklischen Verzweigungen über planare B203(0 H)2-Gruppen K[B6PO 10(OH)4]: A Borophosphate Containing Rods of Tetrahedral Vierer-Rings with Additional Open-Loop Branchings via Planar B20 3(0 H )2 Groups  
 Abstract    K[B6PO|0(OH)4] was prepared under mild hydrothermal conditions (T = 170 °C) from a concentrated solution of K2B40 7 ■ 4H20 , KH2P 04, and HC1 (18%). The crystal structure of the tetragonal compound was solved by X-ray single crystal methods (space group P 4/ncc, No 130): a = 1209.66(13), c = 759.05(7) pm; Z = 4. The anionic partial structure consists of infinite rods of ^ [B6POl0(OH)4]~ which are built of vierer-rings of alternating B 0 4 and P04 tetrahedra with additional open-loop branchings via planar B20 3(0 H)2 groups at the B 0 4 units by sharing common oxygen functions. Potassium (K+) is located within structural channels running along [001]; the eightfold coordination by oxygen (OH-groups) results in a (slightly) distorted tetragonal antiprism. 
  Reference    Z. Naturforsch. 54b, 895—898 (1999); eingegangen am 9. April 1999 
  Published    1999 
  Keywords    Boron, Phosphorus, Tetrahedral Rods, Planar Borate Groups 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-0895.pdf 
 Identifier    ZNB-1999-54b-0895 
 Volume    54