17. Aromaticity
Huckel's Rule
Problem 16-43a
Textbook Question
Textbook QuestionThe ribonucleosides that make up ribonucleic acid (RNA) are composed of d-ribose (a sugar) and four heterocyclic “bases.” The general structure of a ribonucleoside is shown here.
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The four heterocyclic bases are cytosine, uracil, guanine, and adenine. Cytosine and uracil are called pyrimidine bases because their structures resemble pyrimidine. Guanine and adenine are called purine bases because their structures resemble purine.
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(a) Determine which rings of these bases are aromatic.
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