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'Isomers' in keywords Facet   Publication Year 1983  [X]
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1983[X]
1Author    Günter Schmid, Roland BoeseRequires cookie*
 Title    Azaborolinyl Complexes, IX [1] The Crystal and Molecular Structures of Two Isomers of Bis(l-ter£-butyl-2-methyl-??-l,2-azaborolinyl)cobalt  
 Abstract    The crystal and molecular structures of two isomers of bis(l-£er£-butyl-2-methyl-??-l,2-azaborolinyl)cobalt have been determined by single-crystal X-ray diffraction methods. Isomer 1 shows a clockwise, isomer 2 an anti-clockwise conformation of the azaborolinyl rings. In both compounds the azaborolinyl rings have staggered orientations with opposite positions of the tferi-butyl groups. The rings in 1 and 2 are slipped so that the three ring carbon atoms are closer to the cobalt atom than the BN groups. The staggered orientation of the ligands in 2 is probably due to a packing effect, as in similar sandwich complexes the anti-clockwise conformers show eclipsed orientation. 
  Reference    Z. Naturforsch. 38b, 485—492 (1983); eingegangen am 12. November 1982 
  Published    1983 
  Keywords    Azaborolinyl Sandwich Complexes, Cobalt, Isomers, X-Ray 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0485.pdf 
 Identifier    ZNB-1983-38b-0485 
 Volume    38 
2Author    Uwe Klingebiel, Norbert Vater, William Clegg, Martin Haase, GeorgeM. SheldrickRequires cookie*
 Title    Synthesis of Silicon-Phosphorus-Rings - Structure of a cis-2,2,4,4-Tetrakis(silylamino)-l,3-diphospha-2,4-disilacyclobutane  
 Abstract    Fluorosilylphosphanes of the type R2SiFPHR' (R = CHMe2, CMe3, NMeSiMe3; R' = H, C6H5; 1-4) are obtained in the reaction of difluorosilanes with lithiated phosphanes in a molar ratio 1:1. Diphosphasilanes (5, 6) and a difluorosilylphosphane (7) are isolated as by-products. 1-4 react with w-QjHgLi to give cyclic silylphosphanes, LiF, and C4H10 (8-11). Dilithiated 5 reacts with F2PN(CMe3)SiMe3 to form of a four-membered SiP3-ring 12. The 31 P NMR spectra of 9 and 11 show signal coalescence for the eis-and tfrans-isomers at room temperature. The crystal structure of the cis-isomer of 11 has been determined. The substituted ring 13 is prepared in the reaction of lithiated 9 and Me2SiF2. 
  Reference    Z. Naturforsch. 38b, 1557—1562 (1983); eingegangen am 6. Juli 1983 
  Published    1983 
  Keywords    Fluorosilylphosphanes, Cyclisation, P-Inversion, Isomers, Crystal Structure 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-1557.pdf 
 Identifier    ZNB-1983-38b-1557 
 Volume    38