The RNA base uracil is a pyrimidine derivative, usually depicted in its keto form (page 396). The

Question:

The RNA base uracil is a pyrimidine derivative, usually depicted in its keto form (page 396). The enol tautomer readily undergoes electrophilic substitution, unlike most pyrimidines.
a. Draw the structure of the enol tautomer of uracil.
b. Draw the product of the nitration of uracil with HNO3. Where on the ring is the nitronium (NO2+) ion most likely to attack (see Chapter 4)?