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1Author    Atta-Ur -Rahman, Irshad Ali, M. Iqbal, ChaudharyH E JRequires cookie*
 Title    NMR and Mass Spectroscopic Studies on Catharine  
 Abstract    The 13 C NMR of Catharine is reported. A temperature-dependent study of the 'H NMR of Catharine indicates that it exists as two conformers at room temperature. At higher temperatures, the distinction between the two conformers disappears with the higher rate of equilibration. The mass spectral fragmentation of Catharine as established by link scan measurements is also re-ported. 
  Reference    Z. Naturforsch. 40b, 543—545 (1985); received August 20/December 20 1984 
  Published    1985 
  Keywords    Catharine, Conformational Analysis, 13 C NMR 
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 TEI-XML for    default:Reihe_B/40/ZNB-1985-40b-0543.pdf 
 Identifier    ZNB-1985-40b-0543 
 Volume    40 
2Author    Wolfgang PetzRequires cookie*
 Title    About the Reaction of C(NMe2)4 with Some Derivatives of the Carbonic Acid  
 Abstract    The reaction of C(NMe2)4 with C02, COS and CS2 yields hexamethylguanidiniumsalts by transfer of a dimethylaminogroup to the carbonic acid derivate. 1 H, 13 C and IR spectra of the salts are discussed. 
  Reference    (Z. Naturforsch. 31b, 1007—1008 [1976]; eingegangen am 16. März/12. April 1976) 
  Published    1976 
  Keywords    -Dimethylcarbamate, 13 C NMR, Carbonic Acid Derivatives, Hexamethylguanidinium Salts 
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 TEI-XML for    default:Reihe_B/31/ZNB-1976-31b-1007_n.pdf 
 Identifier    ZNB-1976-31b-1007_n 
 Volume    31 
3Author    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 
4Author    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 
5Author    I. Mester, D. Bergenthal, Zs Rózsa, J. ReischRequires cookie*
 Title    3 C-NMR-Spektren einiger Acridon-Derivate [1] 13 C NMR Spectra of Some Acridone Derivatives [1]  
 Abstract    The 13 C NMR spectra of acridone derivatives 3-5, 8-12, melicopicine (14), melicopidine (15) and melicopine (16) are presented. The substituent parameters for OH and OCH3 groups in acridone derivatives have also been given. Hydroxylierte und alkoxylierte Acridone (9.10-Dihydroacridin-9-one) finden sich sowohl unter den Rutaceen-Alkaloiden [2] als auch unter den tieri-schen Stoffwechselprodukten einiger Arzneistoffe [3, 4]. Darüber hinaus mehren sich die Hinweise auf ihre Bedeutung als Grundstrukturen biologisch akti-ver Substanzen wie Phytonzide und Arzneistoffe [4, 5], In diesen Zusammenhängen hat die Analytik der Acridone in den letzten Jahren eine intensive Bearbeitung erfahren [6,7]; allein über die 13 C-NMR-Spektroskopie, die erst jüngst Gegenstand von 
  Reference    Z. Naturforsch. 34b, 516—519 (1979); eingegangen am 16. November 1978 
  Published    1979 
  Keywords    Hydroxyacridones, Methoxyacridones, 13 C NMR, Hydroxy Substituent Parameters, Methoxy Substituent Parameters 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0516.pdf 
 Identifier    ZNB-1979-34b-0516 
 Volume    34 
6Author    A. Kondoh, T. OiRequires cookie*
 Title    Interaction of Alkaline Earth Metal Ions with Acetic and Lactic Acid in Aqueous Solutions Studied by 13 C NMR Spectroscopy  
 Abstract    Interaction of alkaline earth metal (magnesium, calcium, strontium and barium) ions with acetic and lactic acid in aqueous media was investigated by 13 C NMR spectroscopy. In the acetate systems, signals whose chemical shifts were the averages of those of the free and bound acetate ions were observed. Downfield shifts of the carboxylate carbon signals with increasing metal ion concentration indicated that the acetate ion acted as a monodentate ligand coordinating to the metal ion using the carboxylate group. The metal ion concentration dependence of the peak positions of the methine and carboxylate carbon signals of the lactate ion in the lactate systems suggested that the lactate ion coordinated to a metal ion using the carboxylate and hydroxyl groups. Unique upfield shifts upon complexation in the magnesium lactate systems suggested that the lactate ion coordinated to the magnesium ion from outside the primary hydration sphere. The present results were consistent with the isotope effects of the alkaline earth metals observed in cation exchange chromatography. 
  Reference    Z. Naturforsch. 52a, 351—357 (1997); received December 4 1996 
  Published    1997 
  Keywords    13 C NMR, Alkaline Earth Metals, Acetic Acid, Lactic Acid, Isotope Effects 
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 TEI-XML for    default:Reihe_A/52/ZNA-1997-52a-0351.pdf 
 Identifier    ZNA-1997-52a-0351 
 Volume    52 
7Author    Hubert Schmidbaur, Peter HollRequires cookie*
 Title    l.l-Dimethyl-l-methoxy-l/ 5 phospholan und -phosphorinan: Synthese, Struktur und dynamisches Verhalten 1,1 -Dimethyl-1-methoxy-lA 5 phospholane and -phosphorinane: Synthesis, Structure and Dynamic Behaviour  
  Reference    Z. Naturforsch. 33b, 489—492 (1978); eingegangen am 28. Februar 1978 
  Published    1978 
  Keywords    Alkoxy-dialkyl-phospholanes, Intermolecular Ligand Exchange, 13 C NMR, X H NMR, 31 P NMR 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0489.pdf 
 Identifier    ZNB-1978-33b-0489 
 Volume    33 
8Author    HamishG. GrantRequires cookie*
 Title    Studies of the Reaction of Various 1,2-Disubstituted Benzenes with Crotonic Acid in Polyphosphoric Acid  
  Reference    Z. Naturforsch. 34b, 728—733 (1979); received November 27 1978 
  Published    1979 
  Keywords    5, 6-Disubstituted Indan-l-ones, Crotonic Acid, Polyphosphoric Acid, 1-Methyl Benzofurocyclopentan-3-one, 13 C NMR 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0728.pdf 
 Identifier    ZNB-1979-34b-0728 
 Volume    34