IUPAC Parent Chain Selection (Longest chain with highest-priority functional group as parent)
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Longest chain with highest-priority functional group as parent
What each symbol means
| Symbol | What it stands for |
|---|---|
| chain | Continuous carbon backbone including that group |
| principal group | Highest priority functional group (suffix family) |
When to use this
Cyclic parents have special rules; if tie in length, more substituents branch point wins per IUPAC tie-breaks.