The large change in the electronic absorption spectrum of cytidine on going from an aqueous to an aprotic medium is attributed to the existence of a hydrogen bonded solvent‐solute complex in solvents capable of donating a proton. The spectrum of cytidine in a variety of solvents and the spectra of a number of nontautomerising model compounds are presented. The tautomerisin of cytidine and its biological implications are discussed.
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Johnson et al. (1971) studied this question.
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