Basic Organic Nomenclature
If you have been unable to find a name for your ring system from amongst the common names
accepted by IUPAC, this page introduces the IUPAC approach to naming heterocyclic systems with from 3 to 10
atoms in a ring which contains oxygen, sulfur and/or nitrogen.
This systematic approach requires that the heteroatoms in the ring be named using prefixes which are followed by a ring-size root and a suffix indicating whether or not it contains the maximum number of double bonds. The number of different possibilities to look through make this a non-trivial exercise!
1. Heteroatom prefixes and order of priority.
The following table is in decreasing order of priority:
2. The suffix
*Names for compounds with 4 or 5 ring members and 1 (one) double bond).
Review Heterocyclics with common names.
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