Let be the number of common (shared) carbon atoms in a generic spirocyclic compound and be the numbe — IUPAC and Nomenclature Chemistry Question
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 $x + y$?
Answer: 3
💡 Solution & Explanation
A spiro compound has exactly 1 shared carbon atom connecting the two rings (the spiro carbon), so $x=1$. A fused or bridged bicyclic compound has exactly 2 shared carbon atoms (the bridgehead carbons), so $y=2$. The sum $x + y = 1 + 2 = 3$.
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