UPAC Nomenclature Parent is longest chain containing the double bond Number the chain so that the double e) ane changes to -ene. or-diene, -triene bond has the lowest possible number In a ring, the double bond is assumed to be between carbon 1 and carbon 2 > Chapter 7 10Chapter 7 10 IUPAC Nomenclature • Parent is longest chain containing the double bond. • -ane changes to -ene. (or -diene, -triene) • Number the chain so that the double bond has the lowest possible number. • In a ring, the double bond is assumed to be between carbon 1 and carbon 2. =>