Use the following guide to name alkynes according to IUPAC standards.

  1. Number the longest chain containing the triple bond, starting with the end closest to the triple bond.
  2. If the same number of carbons surrounds the triple bond, begin numbering at the end nearest the first branch point.
  3. Name the side chains according to branched hydrocarbon rules.For the parent chain, write, in order, the numerical name (i.e. prop- or hex-), the numerical position of the first carbon in the triple bond,and end with the suffix “-yne”.
  4. For multiple triple bonds, number the parent chain so that the triple bonds have the lowest possible numerical positions.Add the numerical prefix that corresponds to the number of triple bonds present to the suffix “-yne” (i.e. -diyne, triyne).
  5. Rings hold naming priority when they contain side chains with alkynes.Name the side chain according to alkyne rules; name the compound according to cyclic hydrocarbon rules.
  6. For rings that contain triple bonds: Triple bonds have top priority when numbering the ring.Otherwise, follow the same numbering format used in naming cyclic hydrocarbons.Change the suffix from “ane” to “yne”.
  7. To name rings with multiple triple bonds, include the numerical positions and prefixes before the suffix “yne” for the parent ring, similar to naming branched alkynes.

Example: calicheamicin