Let be the number of common (shared) carbon atoms in a generic spirocyclic compound and be the number of common (bridgehead) carbon atoms in a fused bicyclic compound. What is the value of ?

Question

Let $x$ be the number of common (shared) carbon atoms in a generic spirocyclic compound and $y$ be the number of common (bridgehead) carbon atoms in a fused bicyclic compound. What is the value of $x + y$?

Prashant Kotian · Accepted Answer

Correct answer: 3. A spiro compound has exactly 1 shared carbon atom connecting the two rings (the spiro carbon), so . A fused or bridged bicyclic compound has exactly 2 shared carbon atoms (the bridgehead carbons), so . The sum .

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