| OCR Text |
Show 80 specific conformation in the anti range, however, No This is because the actual value of $ assumedo function ,for rotation about the broad and shallow of intra= and glycosidic bond may have van der- be (and the potential cn minimum) depends rather sensitively inte,r=molecular can on somewhat a the balance Waal and hydrogen bonding for-ces For this reason we have not attempted strength of the non=rigid nucleosidic systems with the exception of a I, Equation 406 to from the However if the 70 theory which gave rise is correct an¢ if the bulk of the rotation coupled oscillator mehani compounds substituted of unsaturated adenine ,I, Section nucleosides in at a and particular site should strength (normalized with respect frequency of the transition) is plotted as We must polarization angleo a give consistent 409 and 4012 when to dipole strength function of the assumea of course, that the cQnforma- equilibrium of the molecule is not influenced by the type tional of substituento tutions at This assumption can only be relied upon for substi '.ites far removed from the sugar rno Ie ty , Pyrimidine Nucleosides Ao Table 16 gives Amax' the observed and normalized strengths and the polarization angle for we comes then studies of extended series representations of segments of curves of Figures the rotational the rotational to calculate particularly interesting series of 29a39 , a as estimated from series of 5=substituted uridine nuc.Leos Ldes have plotted RA as a function of Yo , In (RA) rotational Equation 405 Figure 5ql (page 82) |
