Alcohols react with dihydropyran in the presence of acid to give products of general structure I, rather than II. Note that I is an acetal.
(a) Explain why I is formed in preference to II. (Hint: Consider the structures of the two carbocations that would form by protonation of dihydropyran at either alkene carbon.)
(b) From what alcohol and dihydropyran can the compound shown be synthesized?
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