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'NN Dimethylurea' in keywords
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1996 (1)
1Author    Mitra Ghassemzadeh, Klaus Harms, Kurt DehnickeRequires cookie*
 Title    N ,N  
 Abstract    D im ethylharnstoff als chelatisierende Lewis-Säure: Synthese und K ristallstrukturen von PPh4[C l(H 2M e2N2CO)] und (PPh4)2[C l(H 2 M e2N2CO)]Cl N.N'-Dimethylurea as a Chelating Lewis Acid: Synthesis and Crystal Structures of PPh4[Cl(H2Me2N2CO)] and (PPh4)2[Cl(H2Me2N2CO)]Cl The title compounds have been prepared from tetraphenylphosphonium chloride and N,N'-dimethylurea in acetonitrile using different molar ratios of the educts. Both compounds were characterized by IR spectroscopy and by crystal structure determinations. PPh4[C l(H ,M e,N ,C O)l: Space group P i, Z = 4 ,a = 1021.8(2), b = 1192.7(2), c = 2143.9(4) pm, o = 87.21(3)°, ß = 85.95(3)°, = 74.16(3)° (-50°C). (PPh4MCl(H,Me-,N-,CO)]Cl: Space group P2,/n, Z = 4, a = 1138.4(2), b = 2855.4(3), c = 1394.0(1) pm, ß = 91.19(10)° (-60°C). In both compounds the N.N'-dimethylurea molecule acts as a chelating Lewis acid via two Cl -H hydrogen bonds forming nearly planar ClH 2N: C-six-membered heterocycles. 
  Reference    Z. Naturforsch. 51b, 1423—1427 (1996); eingegangen am 5. Juni 1996 
  Published    1996 
  Keywords    Chloride Complexes, NN'-Dimethylurea, Synthesis, Crystal Structure 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-1423.pdf 
 Identifier    ZNB-1996-51b-1423 
 Volume    51