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  • Electronic Resource  (1)
  • 1970-1974  (1)
  • 1972  (1)
  • Polymer and Materials Science  (1)
  • Electronic Resource  (1)
  • 1970-1974  (1)
  • 1972  (1)
  • 1
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Biopolymers 11 (1972), S. 1181-1207 
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The optical and conformational properties of certain 7-ribosyl purines have been studied using several experimental and theoretical methods. The CD, MCD, and absorption spectra of the 7-ribosyl purines and their cations have been determined experimentally with some solvent effects being noted. Theoretically we have used the SCF-CI and CNDO molecular orbital calculations to determine the optical properties of the bases; Simpson's bond exciton theory to determine the optical properties of the bases; Simpson's bond exciton theory to determine the optical properties of the ribose moiety; the optical activity was determined by the dipole coupling and electricmagnetic coupling equations; and the conformational energy calculations are included as a basis for excluding highly improbable conformations. On the basis of these calculations, we concluded that the oxy derivatives and the amino derivatives are predominately in the “extreme anti” conformation and “standard anti” conformation, respectively. However, the conclusions are tentative since at the present time the band assignments are not unequivocal. At least one n-π* transition has been identified in the spectra which is not notably sensitive to pH and solvent effects. Several implications of this observation are discussed.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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