Propose a reasonable mechanism for the following reactions.

Question

Question

Answer 1

Answer #1

Given Reaction:

Mechanism:

An unshared electron pair of pyran is treated with 2-bromomethyl-5-nitrophenol to form a conjugated acid by S_N2 reaction.

The unshared electron pair of hydroxy group is reacted with conjugated acid to form oxonium ion.

The H₂O molecule abstracts a proton from the conjugated acid to give a final product.

Answer 2

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