To what extent can methyl derivatives be regarded as stabilized tautomers of xanthine?

@article{Platonov2005ToWE,
  title={To what extent can methyl derivatives be regarded as stabilized tautomers of xanthine?},
  author={Maxim O Platonov and Svitlana P Samijlenko and O. O. Sudakov and I V Kondratyuk and Dmytro M. Hovorun},
  journal={Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy},
  year={2005},
  volume={62 1-3},
  pages={112-4}
}
Taking xanthine (Xan) as an example, validity of an approach to experimental investigations of nucleotide bases' tautomeric equilibrium, based on the use of methyl derivatives corresponding to their prototropic tautomers, was studied by (1)H NMR in dimethylsulfoxide (DMSO) and by quantum chemical calculations at the B3LYP/6-311++G(d,p) level of theory. From (1)H NMR spectra of m(7)Xan, m(9)Xan, Xan and m(3)Xan conclusion was made that the N7H tautomeric forms of the last two compounds dominate… CONTINUE READING

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