Derivatives of adenosine and uridine, which were substituted only at the sugar moiety and which were soluble in CCl4, have been prepared. The concentration-dependencies of the IR-spectra of 2′.3′-Isopropylidene-5′-trityl-adenosine (ITA) and 2′,3′-Isopropylidene-5′-trityl-uridine (ITU) in CCl4 indicated that hydrogen-bonded, cyclic dimers were formed at low concentrations. In solutions of equimolar amounts of ITA and ITU the hetero-associate containing an adenine-uracil-pair was found to be more stable than the homo-associates.
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