The proton NMR spectrum of 2-pyridone gives the chemical
Chapter 10, Problem 18P(choose chapter or problem)
The proton NMR spectrum of 2-pyridone gives the chemical shifts shown.
(a) Is 2 -pyridone aromatic?
(b) Use resonance forms to explain your answer to (a). Also explain why the protons at and
are more deshielded than the other two
and
.
(c) Thymine is one of the heterocyclic bases found in DNA. Do you expect thymine to be aromatic? Explain.
(d) The structure of 5 -fluorouracil is shown in the box at the side of the page. Is 5 -fluorouracil aromatic? Explain.
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