Go toArchive
Browse byFacets
Bookbag ( 0 )
'Shift Reagents' in keywords Facet   section ZfN Section B  [X]
Results  3 Items
Sorted by   
Publication Year
1984 (2)
1981 (1)
1Author    O. Tto, O. Lfb, Onowara Begum2, Hans GeigerbRequires cookie*
 Title    Fluorescence Properties of Hydroxy-and Methoxyflavones and the Effect of Shift Reagents  
 Abstract    The fluorescence spectra o f 42 hydroxy-and m ethoxyflavones in m ethanol solution have been investigated. The follow ing findings are considered to be useful in structure elucidation and identification o f flavonoids: (a) The maxima of the absorption and fluorescence bands give, in m ost cases, a unique combination; (b) flavones exhibit exceptionally large Stok es' shifts (6,800 to 
  Reference    Z. Naturforsch. 39b, 231 (1984); received Septem ber 23 1983 
  Published    1984 
  Keywords    Flavonoids, F luorescence, Structure Elucidation, Shift Reagents 
  Similar Items    Find
 TEI-XML for    default:Reihe_B/39/ZNB-1984-39b-0231.pdf 
 Identifier    ZNB-1984-39b-0231 
 Volume    39 
2Author    O. Tto, S. W. Olfbeis, Eva Fiirlinger3, HemC. Handra Jhab, Fritz ZillikenbRequires cookie*
 Title    The Absorption and Fluorescence of Isoflavones and the Effect of Shift Reagents  
 Abstract    The absorption and fluorescence maxima o f 20 isoflavones have been determ ined in methanol solution and the effect o f addition o f w ater, 50% sulfuric acid, aluminium trichloride, borax, sodium acetate, ammonia and sodium hydroxide has been studied. The following findings may be useful in the structure elucidation o f naturally occurring isoflavones: (a) 5-Hydroxyisoflavones have band I absorption maxima around 335 nm. 6-hydroxyisoflavones betw een 310 and 330 nm, 
  Reference    Z. Naturforsch. 39b, 238 (1984); received Septem ber 23 1983 
  Published    1984 
  Keywords    Isoflavonoids, F luorescence, A bsorption, Shift Reagents 
  Similar Items    Find
 TEI-XML for    default:Reihe_B/39/ZNB-1984-39b-0238.pdf 
 Identifier    ZNB-1984-39b-0238 
 Volume    39 
3Author    *-*, Gerhard Nonnenmacher, Gottfried Zimmermann®, Otto Isaac»Requires cookie*
 Title    Elmar Flaskamp  
 Abstract    The stereochemistry of the bisaboloids in chamomile—with the exception of bisabolol-oxide C—has been elucidated. The in-vitro-examination of the mutual convertibüities of some bisaboloids gave evidence for the stereochemical accordance of the common chiral centres of all the bisaboloids. The absolute configurations of the remaining third asym-metric carbon atoms in bisabololoxide A and B have been determined by NMR spectro-metric studies in comparison with their unnatural semisynthetic epimers. All the stereo-genie centres of the bisabololoxides A and B, of (—)-a-bisabolol and of bisabolonoxide A turn out to be S-configurated. 
  Reference    Z. Naturforsch. 36b, 1023—1030 (1981); eingegangen am 30. April 1981 
  Published    1981 
  Keywords    Matricaria chamomilla L, Bisaboloids, 13 C NMR Spectra, Shift-Reagents 
  Similar Items    Find
 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-1023.pdf 
 Identifier    ZNB-1981-36b-1023 
 Volume    36