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'Conformation' in keywords Facet   Publication Year 1983  [X]
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1983[X]
1Author    Rainer Mattes, Franz WaldmannRequires cookie*
 Title    Molekülstruktureii, Schwingungsspektren und Konformation der Thiooxalsäurederivate CH3S-CO-CONH2, CH3S-CS-CONH2, C2H50-C0-CSNH2 und K[OSC-CONH2] Molecular Structure, Vibrational Spectra and Conformation of the Thiooxalic Acid Derivatives CH3S-CO-CONH2, CH3S-CS-CONH2, C2H50-C0-CSNH2 and K[OSC-CONH2]  
 Abstract    The crystal structures ofCH3S-CO-CONH2 (1), CH3S-CS-CONH2 (2), C2H50-C0-CSNH2 (3) and K[OSC-CONH2] (4) have been determined by single crystal X-ray diffraction. The molecules 1, 2 and 3 are nearly planar and form centrosymmetric dimers by N H • • • O or N-H--S hydrogen bonds with the amidic oxygen or sulfur atom as acceptor atoms. The anion of 4 is not quite planar. The torsional angle around the C-C bond is 18.4°. The con-formations of the title compounds are E, Z' (1 and 2), Z, Z' (3) and Z (4). According to the vibrational spectra, which are discussed briefly, 1 and 3 retain their conformation also in solution. 
  Reference    Z. Naturforsch. 38b, 335—340 (1983); eingegangen am 5. November 1982 
  Published    1983 
  Keywords    Molecular Structure, Conformation, Vibrational Spectra, Thiooxalic Acid Derivatives 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0335.pdf 
 Identifier    ZNB-1983-38b-0335 
 Volume    38 
2Author    Ludwig Roß, Martin DrägerRequires cookie*
 Title    Phases of Decaphenylcyclopentagermane (Ph2Ge)s [1]  
 Abstract    (Pb^Ges) can be obtained from solutions in five crystalline phases, two pure and three including solvent of crystallization. This is lost at 70 °C. At 190 °C all phases transform into a plastic crystalline phase. For this tetragonal phase a gear wheel model for librations of the molecules is developed. The crystal structure of triclinic (Ph2Ge)s has been determined and refined to R = 0.050. The molecule has a flexible conformation in accordance with a better solubility than exhibited by the homologous rings (Ph2Ge)4 and (Ph2Ge)6 containing rigid normal conformations. The arrangement of phenyl groups is either parallel or perpendicular for both cases intra-and intermolecular. The compound (Ph2Ge)6 attains a plastic crystalline state at 346 °C. 
  Reference    Z. Naturforsch. 38b, 665—673 (1983); eingegangen am 28. Januar 1983 
  Published    1983 
  Keywords    Germanium, Homocycle, Conformation, Plastic Crystalline State 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-0665.pdf 
 Identifier    ZNB-1983-38b-0665 
 Volume    38 
3Author    Anders Ljungqvist, Karl FolkersRequires cookie*
 Title    Study of Hydrogenolytic Cleavage of Peptide-Resin Benzyl Ester Bonds for Synthesis of Protected Fragments of the Human Leukocyte Interferon  
 Abstract    Three Boc-protected fragments of the human leukocyte interferon, LeIFA, have been synthesized: I, BOC LeIFA (99-105) (BOC-Val-Ile-Gln-Gly-Val-Gly-Val); II, BOC LeIFA (116-119) (BOC-Ile-Leu-Ala-Val); III, BOC LeIFA (123-126) (BOC-Phe-Gln-Arg(Tos)-Ile). The presence of the Boc-group was desired so that these peptides could serve as intermediates in fragment condensation toward larger segments of interferon. To achieve these intermediates, a study was desirable on three methods of cleavage of the benzyl ester-polymer bonds. It was found that hydrogenolysis with hydrogen and palla-dium generated in situ was distinctly superior to transfer hydrogenation with ammonium formate or cyclohexene. An effective swelling of the peptide-resin to allow penetration of palladium acetate into the matrix and mobility of the peptide chains on the resin to expose the benzyl ester bond to hydrogenolysis appear to be essential conditions for the best cleavage. 
  Reference    Z. Naturforsch. 38b, 1022—1024 (1983); received May 2 1983 
  Published    1983 
  Keywords    Interferon, Peptide Synthesis, Hydrogenation, Palladium Black, Conformation 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-1022.pdf 
 Identifier    ZNB-1983-38b-1022 
 Volume    38 
4Author    Michael Morr, Ludger Ernst, Lutz GrotjRequires cookie*
 Title    2' ,3' -Dideoxy-3' -C-(phosphonomethyl)adenosine, the Phosphonate Analogue of 2'-Deoxyadenosine 3'-Phosphate  
 Abstract    The title compound 7 is prepared in a five-step synthesis starting from l,2-di-0-acetyl-5-0-benzoyl-3-deoxy-3-0-(diethoxyphosphonomethyl)-/3-D-ribofuranose (2). The preferred conformation of 7 is derived from its X H and 13 C NMR data. 
  Reference    Z. Naturforsch. 38b, 1665—1668 (1983); received July 6 1983 
  Published    1983 
  Keywords    Nucleotide Analogue, Phosphonate, !H NMR Spectra, 13 C NMR Spectra, 31 P NMR Spectra, Conformation 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-1665.pdf 
 Identifier    ZNB-1983-38b-1665 
 Volume    38