IUPAC
International Union of Pure and
Applied Chemistry
• Standardized rules to avoid duplicate names
• a unique name for Compounds
IUPAC rules
•Find the highest priority functional group. Determine the longest carbon chain. In cyclic compounds, the ring is
usually considered the parent chain, unless it is attached to a longer
chain of carbons; indicate a ring with the prefix “cyclo” before the roo
name
• Assign numbers to each C of the parent chain
• Naming Side Chains
• Indicate the number of identical groups by the prefixes di, tri, tetra etc.
• Identify all of the substituents (groups appending from the parent chain).
• Attach a prefix Place the position numbers and names of the substituents
groups, in alphabetical order, before the root name. In alphabetizing,
ignore prefixes like sec-, tert-, di, tri, etc., but include iso and cyclo
•Find the highest priority functional group. Determine the longest carbon chain. In cyclic compounds, the ring is
usually considered the parent chain, unless it is attached to a longer
chain of carbons; indicate a ring with the prefix “cyclo” before the roo
name
• Assign numbers to each C of the parent chain
• Naming Side Chains
• Indicate the number of identical groups by the prefixes di, tri, tetra etc.
• Identify all of the substituents (groups appending from the parent chain).
• Attach a prefix Place the position numbers and names of the substituents
groups, in alphabetical order, before the root name. In alphabetizing,
ignore prefixes like sec-, tert-, di, tri, etc., but include iso and cyclo