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Search for "tautomerism" in Full Text gives 54 result(s) in Beilstein Journal of Organic Chemistry.

(Pseudo)amide-linked oligosaccharide mimetics: molecular recognition and supramolecular properties

  • José L. Jiménez Blanco,
  • Fernando Ortega-Caballero,
  • Carmen Ortiz Mellet and
  • José M. García Fernández

Beilstein J. Org. Chem. 2010, 6, No. 20, doi:10.3762/bjoc.6.20

Graphical Abstract
  • pseudooligosaccharide 42 with different secondary amines gave the corresponding guanidines 43–46 (Scheme 5) and their conformational behaviour and tautomerism was studied by NMR spectroscopy. β(1→6)-Linked pseudodi- (47) and pseudotrisaccharides (48) incorporating guanidine intersaccharide bridges have been prepared
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Review
Published 22 Feb 2010

C2-symmetric bisamidines: Chiral Brønsted bases catalysing the Diels- Alder reaction of anthrones

  • Deniz Akalay,
  • Gerd Dürner,
  • Jan W. Bats and
  • Michael W. Göbel

Beilstein J. Org. Chem. 2008, 4, No. 28, doi:10.3762/bjoc.4.28

Graphical Abstract
  • reaction of anthrones 1 and maleimides 2 catalyzed by chiral Brønsted bases 4–8. Protonation states and tautomerism of C2-symmetric bisamidine 8a [6]. Synthesis of C2-symmetric bisamidines 8b–c and ent-8d. Proposed mechanism of the Diels-Alder reaction. First evaluation step of chiral bisamidine catalysts
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Full Research Paper
Published 07 Aug 2008

Variations in product in reactions of naphthoquinone with primary amines

  • Marjit W. Singh,
  • Anirban Karmakar,
  • Nilotpal Barooah and
  • Jubaraj B. Baruah

Beilstein J. Org. Chem. 2007, 3, No. 10, doi:10.1186/1860-5397-3-10

Graphical Abstract
  • with dD-H, 0.889 Å, dH-A 2.287 Å, dD-A 3.151 Å, Tautomerism of the imine and amine group
  • leads to the desired product. Valence tautomerism is commonly observed in metal complexes of 1,2-quinonic compounds. [16][17][18][19][20][21][22] In our reactions two moles of amines are used; with one mole of 1,2-naphthoquinone the same product is obtained as with 1:1 stoichiometry between amine and
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Preliminary Communication
Published 01 Mar 2007

Efficient synthesis of 5-substituted 2-aryl- 6-cyanoindolizines via nucleophilic substitution reactions

  • Eugene V. Babaev,
  • Natalya I. Vasilevich and
  • Anna S. Ivushkina

Beilstein J. Org. Chem. 2005, 1, No. 9, doi:10.1186/1860-5397-1-9

Graphical Abstract
  • the structure A for indolizinones 1, we assumed the existence of tautomerism between forms A and B involving hydrogen interchange between oxygen and C-3 carbon (Scheme 1). Although the amount of tautomer B is negligibly small, one would expect that treatment of 1 a – d with phosphorous oxychloride may
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Preliminary Communication
Published 07 Oct 2005
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