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1Author    FrankW. Heinemann, Helm Ut, Hartung, NadjaM. AierRequires cookie*
 Title    Kristall-und Molekülstruktur von 2-[3-(N,N-Diethylammonium)propylimino]-2-phenyl-dithioacetat Crystal and Molecular Structure of 2-[3-(N,N-Diethylammonium)propylimino]-2-phenyl-dithioacetate  
 Abstract    The title compound, formed by the reaction o f acetophenone with 3-diethylamino-1-propylamine and sulfur, crystallizes in the orthorhombic space group P 2 12 12 1 (Z = 4) with lattice constants a = 818.1(2) pm, b -1225.1(2) pm and c = 1622.4(4) pm. The characterization of the molecule as a zwitterion is established by the observed bond parameters. Both spec­ troscopic investigations and the results of the X-ray structure determination show that a hydrogen atom is bonded to the amino nitrogen rather than to the imino nitrogen. 
  Reference    (Z. Naturforsch. 50b, 81—8 [1995]; eingegangen am 9. August 1994) 
  Published    1995 
  Keywords    Dithioacetates, A cetophenone, Crystal Structure, Zwitterion, Betaine 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0081.pdf 
 Identifier    ZNB-1995-50b-0081 
 Volume    50 
2Author    Reinhold Tacke, Joachim Heermann, Melanie PiilmRequires cookie*
 Title    Pentafluoro[(4-methyl-1,4-bisazoniacy clohex-1 -yl)methy 1] germanate Hydrate: Synthesis and Crystal Structure of a Zwitterionic A6Ge-Germanate with a GeF5C Framework  
 Abstract    The zwitterionic (molecular) A6Ge-germanate pentafluoro[( 
  Reference    Z. Naturforsch. 53b, 535—539 (1998); received December 17 1997 
  Published    1998 
  Keywords    Hexacoordinate Germanium, Zwitterion, Preparation, Crystal Structure 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0535.pdf 
 Identifier    ZNB-1998-53b-0535 
 Volume    53 
3Author    JeffreyB H Arborne, Marian BoardleyRequires cookie*
 Title    The Widespread Occurrence in Nature of Anthocyanins as Zwitterions  
 Abstract    An electrophoretic survey of anthocyanins in flowers of 81 species belonging to 27 plant families indicated that malonated or similarly substituted zwitterionic anthocyanins occur in half the sample. In particular, almost all species surveyed in the Compositae and the Labiatae were positive. The same results were also indicated by HPLC separations. Detailed examination of the anthocyanins of Dahlia variabilis and Plectranthus argentatus confirmed the presence of malonyla-tion through glucose. It appears that anthocyanins substituted by aliphatic dicarboxylic acids may be widespread in the angiosperms. 
  Reference    Z. Naturforsch. 40c, 305—308 (1985); received January 16 1985 
  Published    1985 
  Keywords    Angiosperms, Flower Pigments, Malonated Anthocyanins, Zwitterions 
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 TEI-XML for    default:Reihe_C/40/ZNC-1985-40c-0305.pdf 
 Identifier    ZNC-1985-40c-0305 
 Volume    40 
4Author    Edgar Niecke, Rainer KröherRequires cookie*
 Title    Synthese und Additionsreaktionen von 1.3.2A 2 .4-Diazaphosphoniaahiminatacyclobutanen [1] Synthesis and Addition Reactions of l,3,2/. 2 ,4-Diazaphosphoniaaluminatacyclobutanes [1]  
 Abstract    -silylated aminoiminophosphines react with aluminium trihalides to give acyclic zwitterions having two-coordinated phosphorus. At about room temperature these adducts decompose by elimination of silylhalide and formation of l,3,2A 2 ,4-diazaphosphonia-aluminatacyclobutanes. Reaction of halogens and alkyl halides with the cyclic zwitterions results in formation of the corresponding 1,1-addition products. With alkyl-azides one obtains bicyclic phosphorus nitrogen heterocycles whilst in the reaction with trimethyl-silylazide the isomeric monocyclic azide derivative is formed. The IR and NMR spectra of the cyclic zwitterions are briefly discussed. 
  Reference    Z. Naturforsch. 34b, 837—842 (1979); eingegangen am 2. Februar 1979 
  Published    1979 
  Keywords    Zwitterions, Twofold Coordinated Phosphorus, Addition Reactions, IR, NMR N 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0837.pdf 
 Identifier    ZNB-1979-34b-0837 
 Volume    34