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(C) The reaction involves an acid-catalyzed ring expansion (a type of Wagner-Meerwein rearrangement). $1$. Protonation of the carbonyl oxygen of the s

Vedclass · Accepted Answer

Spiro[$4.4$]nonan$-1-$one

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(C) The reaction involves an acid-catalyzed ring expansion (a type of Wagner-Meerwein rearrangement). $1$. Protonation of the carbonyl oxygen of the spiro-ketone creates a carboxonium ion $(A)$. $2$. The cyclobutane ring undergoes a $1,2$-alkyl shift to the adjacent carbocation center,which is driven by the relief of ring strain (cyclobutane has a high strain energy of $\approx 26 \ kcal/mol$ compared to the cyclopentane ring formed). $3$. This rearrangement expands the four-membered ring into a five-membered ring,resulting in a spiro[$4.4$]nonan$-1-$one system. $4$. Deprotonation yields the final product,spiro[$4.4$]nonan$-1-$one.

Identify product $(P)$

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