The 100- and 220- MHz p.m.r. spectra of uridine, cytidine, and their 2′-O-methyl derivatives are obtained in aqueous solution at several temperatures. The experimental chemical shifts and coupling constants are discussed in terms of the overall molecular conformation. The conclusion is reached that 2′-O-methylation has little effect upon the three-dimensional structure of a nucleoside at the monomer level in an aqueous environment.
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Hruska et al. (1973) studied this question.