IUPAC Rules for Alkyne Nomenclature

  1. The yne suffix (ending) indicates an alkyne or cycloalkane.
  2. The longest chain chosen for the root name must include both carbon atoms of the triple bond.
  3. The root chain must be numbered from the end nearest a triple bond carbon atom. If the triple bond is in the center of the chain, the nearest substituent rule is used to determine the end where numbering starts.
  4. The smaller of the two numbers designating the carbon atoms of the triple bond is used as the triple bond locator.
  5. If several multiple bonds are present, each must be assigned a locator number. Double bonds precede triple bonds in the IUPAC name, but the chain is numbered from the end nearest a multiple bond, regardless of its nature.
  6. Because the triple bond is linear, it can only be accommodated in rings larger than ten carbons. In simple cycloalkanes the triple bond  carbons are assigned ring locations #1 and #2. Which of the two is #1 may be determined by the nearest substituent rule.
  7. Substituent groups containing triple bonds are:

HC=C- Ethynyl group

HC=C-CH2- Propargyl group

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