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1980 (1)
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1978 (2)
1977 (2)
1Author    Requires cookie*
 Title    Infrarot-und Raman-spektroskopische Untersuchungen an Stereoisomeren eines anorganischen Phosphor-Stickstoff-Ringsystems* Infrared-and R am anspectroscopic Studies on Stereoisom ers o f an Inorganic Phosphorus-N itrogen-R ing-System  
 Abstract    U d o E n g e l h a r d t und G e r d D . J ü r g e n s The reaction of M eO P (S)C l2 with N 2H 5O H leads to cis-and £rans-3,6-dimethoxy-3,6-dithiocyclo-3,6-diphospha-l,2,4,5-tetrazane (1). The configurations of the products are assigned from comparisons of their Raman and IR spectra and from chromatographic and solubility data. 
  Reference    (Z. Naturforsch. 32b, 1259—1262 [1977]; eingegangen am 1. August 1977) 
  Published    1977 
  Keywords    Diphosphatetrazanes, Hydrazine, Methoxy-thiophosphoricdichloride, Raman, *H NMR 
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 TEI-XML for    default:Reihe_B/32/ZNB-1977-32b-1259.pdf 
 Identifier    ZNB-1977-32b-1259 
 Volume    32 
2Author    Y. Plancke, J.P H Énichart, J. L. BernierRequires cookie*
 Title    M echanism Proposal for a Fluorescent Am anitin Derivative Form ation  
 Abstract    A quantitative fluorimetric detection o f a-amanitin treat­ ed by H 3PO" is proposed. Spectra for both amanitin and tryptophan suggest an extended aromatic structure clearly confirmed by JH NMR spectrography. 
  Reference    Z. Naturforsch. 35c, 516—518 (1980); received October 22 1979/January 21 1980 
  Published    1980 
  Keywords    a-Amanitin, Tryptophan, Fluorimetric Detection, *H NMR 
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 TEI-XML for    default:Reihe_C/35/ZNC-1980-35c-0516_n.pdf 
 Identifier    ZNC-1980-35c-0516_n 
 Volume    35 
3Author    Requires cookie*
 Title    Beiträge zur Chemie der Pyrrolpigmente, X V II1  
 Abstract    Struktur-und konformationsanalytische Untersuchungen am chromophoren System der Bilivioline [Biladiene-(a.b)] On the Chemistry of Pyrrole Pigments, X V II Investigations of Structure and Conformation of the Chromophoric System of Biliviolines [Biladienes-(a,b)] H e i n z F a l k , S t e f a n G e r g e l y , K a r l G r u b m a y r u n d O t m a r H o f e r The {Z,Z)-configuration of the bilivioline chromophoric system was established in ­ vestigating an appropriate model compound by means of pK measurement, X H NMR spectroscopy Lanthanide ion induced shift technique, electron absorption spectroscopy and P P P calculations. Moreover a syn-syn conformation which is twisted at the a-methine single bond and planar within the pyrromethene unit (based on the concept of partial structures of bile pigments) of the molecule was deduced. 
  Reference    (Z. Naturforsch. 32b, 299—303 [1977]; eingegangen am 12. November 1976) 
  Published    1977 
  Keywords    !H NMR, Lanthanide Shifts, PP P calculations, UV, Tautomeric Equilibrium 
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 TEI-XML for    default:Reihe_B/32/ZNB-1977-32b-0299.pdf 
 Identifier    ZNB-1977-32b-0299 
 Volume    32 
4Author    Heinz Falk, Karl Grubmayr, Klaus ThirringRequires cookie*
 Title    Beiträge zur Chemie der Pyrrolpigmente, XXIII [1] Die Struktur eines Bilatrien-abc-Derivates im gelösten Zustande On the Chemistry of Pyrrole Pigments, XXIII [1] The Structure of a Bilatriene-abc Derivative in the State of Solution  
 Abstract    The (Z,Z,Z)-configuration of the mono-lactim-ether of an alkyl substituted bilatriene-abc, Etiobiliverdin-IV-y, was established for chloroform solutions. Moreover the confor-mation of this molecule is a helical one (syn-syn-syn) with a twist along the single bonds at the methine groups of approximately 20°. The two tautomeric lactam-forms with a proton on one or the other nitrogen atom of the pyrromethene subsystem are indistin-guishable by the methods used in this investigation: *H NMR pattern, Lanthanide induced shift technique and Nuclear Overhauser Effect measurements. 
  Reference    Z. Naturforsch. 33b, 924—931 (1978); eingegangen am 30. Januar 1978 
  Published    1978 
  Keywords    *H NMR, Lanthanide Shifts, Configuration, Conformation, Tautomeric Equilibrium 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0924.pdf 
 Identifier    ZNB-1978-33b-0924 
 Volume    33 
5Author    Henri Brunner, Isabella Bauer, Rainer LukasRequires cookie*
 Title    Optisch aktive Übergangsmetall-Komplexe, LXIII [1] Asymmetrische Induktion in C5H5Mo(CO)2LX-Diastereomeren-Gleichgewichten Optically Active Transition Metal Complexes, LXIII [1] Asymmetrie Induction in CsHsMo^O^LX Diastereoisomer Equilibria  
 Abstract    The thioamidato complexes CsH5(CO)2MoSC(R)NCH(CH3) (Ar), derived from acetic acid R = CH3 and benzoic acid R = CßHs, were prepared and characterized. The diastereo-isomers, differing in their X H NMR spectra, were partly separated by fractional crystalli-zation. After equilibration with respect to the labile Mo configuration the diastereoisomer ratio, a measure for the asymmetric induction from the chiral ligand on the formation of the two Mo configurations at equilibrium, was determined by 1 H NMR integration. The asymmetric induction is very high for Ar = o-tolyl [76% (R = CH3) and 84% (R = CeHs)] compared to Ar = phenyl [48% (R = CH3) and 56% (R = CßHs)] and Ar = m-and p-tolyl [52 and 44% (R = CH3)]. The (CO)3Cr complexed phenyl substituent with only 10% asymmetric induction does not show the ß-phenyl effect, a weak attraction between aryl groups in /^-position to the metal atom and the MC5H5 moiety. 
  Reference    Z. Naturforsch. 34b, 1418—1423 (1979); eingegangen am 16. Mai 1979 
  Published    1979 
  Keywords    Chiral Organo-Transition Metal Complexes, Labile Metal Configuration, !H NMR 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-1418.pdf 
 Identifier    ZNB-1979-34b-1418 
 Volume    34 
6Author    Jochen Eilermann, Horst Schössner, HelmutA. LindnerRequires cookie*
 Title    Chemie polyfunktioneller Liganden  
 Abstract    , XLIV [1] Darstellung und Eigenschaften von l.l.l-Tris(diiodarsinomethyl)ethan Chemistry of Polyfunctional Ligands, XLIV [1] Preparation and Characterization of l,l,l-Tris(diiodarsinomethyl)ethane 
  Reference    Z. Naturforsch. 33b, 603—605 (1978); eingegangen am 23. März 1978 
  Published    1978 
  Keywords    l, l, l-Tris(diiodarsinomethyl)ethane, Raman, IR, FIR, *H NMR 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0603.pdf 
 Identifier    ZNB-1978-33b-0603 
 Volume    33 
7Author    Heinz-Peter Schuchmann, Clemens Von SonntagRequires cookie*
 Title      
 Abstract    The photolysis of twelve aromatic ethers in solution has been studied by CIDNP and product analysis. The primary step is the scission of the C-O bond in the excited singlet state. The partners of the resulting radical pair (Ph-O" and R 1) undergo three major reactions: (i) geminate recombination and out-of-cage combination resulting in the reformation of the starting material, (ii) geminate recombination and out-of-cage combination resulting in cyclohexa-2,5-dienones and cyclohexa-2,4-dienones which are isomers of the starting material, (iii) H-abstraction from the solvent by the more reactive ones of the two radicals (mainly RO") and combination of the less reactive ones {e.g. benzyl) in the bulk solution. The quantum yield of photodecomposition is low for diphenyl ether (0 ~ 0.002) but approaches unity (0.3-0.9) in benzyl aryl ethers where the benzyl-oxygen bond is cleaved. If the aroxyl radicals are substituted in ortho (para) position the resulting ortho (para)-disubstituted cyclohexadienones are stable. Otherwise they swiftly rearrange into the phenols. The cyclohexa-2,4-dienones which are the precursors of the ortho-substituted phenols isomerize faster than the cyclohexa-2,5-dienones that give the para-substituted phenols. The rates of these rearrangement reactions are enhanced by acid catalysis. 
  Reference    Z. Naturforsch. 34b, 1002—1009 (1979); received February 23 1979 
  Published    1979 
  Keywords    !H NMR, Photo-CIDNP, Photolysis of Aryl Ethers, Keto-Enol Tautomers, Quantum Yields 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-1002.pdf 
 Identifier    ZNB-1979-34b-1002 
 Volume    34