Question

IUPAC name of the following compound is:

• A. tricyclo [2, 2, 1, $0^{2,6}$] heptane
• B. tricyclo [2, 2, 2, $1^{1,5}$] heptane
• C. tetra cyclo [2, 1, 0, $1^{1,2}$] heptane
• D. tetra cyclo [2, 2, 1, $0^{2,6}$] heptane

Hint:

For tetracyclic systems, identify the main bicyclic path first, then locate the additional "zero-length" bridges.

Answer 1

The Correct Option is D

Step 1: Concept The naming of polycyclic compounds involves identifying the number of rings (using the prefix bicyclo, tricyclo, tetracyclo, etc.) and the number of atoms in the bridges.

Step 2: Meaning The compound shown is Nortricyclane, which contains four rings in its structure.

Step 3: Analysis The total number of carbons is 7 (heptane). By following the von Baeyer system for polycyclic nomenclature, we count the bridges starting from the largest. The tetracyclo prefix is used because four scissions are needed to create an open-chain structure.

Step 4: Conclusion The systematic numbering and bridge identification lead to the name tetracyclo [2, 2, 1, $0^{2,6}$] heptane. Final Answer: (D)