Abstract
The ionization constants and ultraviolet
spectra of cytosine, of its appropriately methylated derivatives, and of
related compounds are used to indicate that its pre- dominant tautomeric form
in aqueous solution is 4-amino-1,2-dihydro-2-oxopyrimidine.
This is in sharp contrast to its recent formulation as a zwitterion on the
grounds of its nuclear magnetic resonance spectrum.
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35 articles.
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