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'FAB MS' in keywords Facet   section ZfN Section C:Volume 043  [X]
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1988 (2)
1Author    Denis Barron, RagaiK. IbrahimRequires cookie*
 Title    Synthesis of Flavonoid Sulfates. II. The Use of Aryl Sulfatase in the Synthesis of Flavonol-3-sulfates  
 Abstract    The rates of aryl sulfatase hydrolysis of several 7-, 4'-and 3-sulfated flavonoids were compared and found to follow the order 7 or 4' >» 3. The complete resistance of the 3-sulfate ester to enzyme hydrolysis provided a unique and convenient method for the synthesis of a number of naturally occurring flavonol-3-sulfates from the corresponding higher sulfated analogs in quanti-tative yield. 
  Reference    Z. Naturforsch. 43c, 625—630 (1988); received February 23/May 17 1988 
  Published    1988 
  Keywords    Flavonol Sulfate Esters, Synthesis, 13 C NMR, FAB-MS, UV Spectra 
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 TEI-XML for    default:Reihe_C/43/ZNC-1988-43c-0625.pdf 
 Identifier    ZNC-1988-43c-0625 
 Volume    43 
2Author    Denis Barron, RagaiK. IbrahimRequires cookie*
 Title    Synthesis of Flavonoid Sulfates. III. Synthesis of 3',4'-ortho Disulfates Using Sulfur Trioxide-trimethylamine Complex, and of 3'-SuIfates Using Aryl Sulfatase  
 Abstract    A number of flavonoid 3',4'-disulfates were synthesized from the corresponding 4'-sulfate esters, using sulfur trioxide-trimethylamine complex. Desulfation of the sulfate esters using aryl sulfatase demonstrated that the rate of hydrolysis of the 3'-sulfate group was slower than either the 7-or 4' groups, thus allowing the specific synthesis of flavonol 3,3'-disulfates. The effects of ori/io-disulfation on the L1 C NMR spectra of flavonoids, and the regative FAB-MS spectra of di-and trisulfated flavonoids are discussed. 
  Reference    Z. Naturforsch. 43c, 631—635 (1988); received March 18 1988 
  Published    1988 
  Keywords    Flavonoid Sulfate Esters, Synthesis, 13 C NMR, FAB-MS, UV Spectra 
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 TEI-XML for    default:Reihe_C/43/ZNC-1988-43c-0631.pdf 
 Identifier    ZNC-1988-43c-0631 
 Volume    43