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1997 (1)
1992 (1)
1Author    Teodor Silviu Balabana ', NinaG. FurmanovabRequires cookie*
 Title    7T-7T Interactions between Pyrylium and Phenyl Rings in the Crystal  
 Abstract    The crystal structures of two isomeric phenyl-substituted pyrylium perchlorates, 2,6-di-methyl-4-phenylpyrylium (1) and 2,4-dim ethyl-6-phenylpyrylium (2), have been determined. Both cations are planar in the crystal so that the electron deficient pyrylium rings can interact strongly with the phenyl rings of adjacent molecules forming stacks along the shortest crys-tallographic axis. The phenyl rings may act as donors in a charge transfer interaction which is more pronounced in 1 than in 2. Charge transfer appears as a non-mandatory consequence of the 7T-7T stacking. The structures demonstrate the electrostatic nature of these interactions conforming to the model of Hunter and Sanders [ 1 ]. 
  Reference    Z. Naturforsch. 52b, 485 (1997); received January 13 1997 
  Published    1997 
  Keywords    Pyrylium Salt, Crystal Engineering, Charge Transfer, Crystal Structure 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-0485.pdf 
 Identifier    ZNB-1997-52b-0485 
 Volume    52 
2Author    M. Ariana Bogatian, Calin Deleanu, Gheorghe Mihai, TeodorSilviu BalabanRequires cookie*
 Title    Pyrylium Salts with Long Alkyl Substituents, II [1] 2,4-Dimethyl-6-undecylpyrylium Perchlorate and Derived Pyridinium Salts Center o f Organic Chemistry o f the Roumanian Academy Splaiul Independentei  
 Abstract    The crystalline title pyrylium salt was obtained by SnCl4 catalysed acylation o f mesityl oxide with lauroyl chloride followed by treatment with perchloric acid and column chromatography. This new pyrylium salt was converted in high yields into the corresponding pyridine and N -substituted pyridinium salts (N-m ethyl, N-phenyl, N-(4-«-butylphenyl), and N -dodecyl) whose proton (300 M Hz) and carbon-13 (75 M Hz) N M R spectra are presented. 
  Reference    Z. Naturforsch. 47b, 1011—1015 (1992); received September 25 1991/January 10 1992 
  Published    1992 
  Keywords    Pyrylium Salts, Pyridinium Salts, Synthetic Amphiphiles, N M R Spectra 
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 TEI-XML for    default:Reihe_B/47/ZNB-1992-47b-1011.pdf 
 Identifier    ZNB-1992-47b-1011 
 Volume    47