Sequence Rules:The E,Z Designation If the higher-priority groups on each carbon are on the same side of the double bond,the alkene is designated Z If the higher-priority groups on each carbon are on opposite sides of the double bond,the alkene is designated E Lower Higher E double bond (Higher-priority groups Higher are on opposite sides.) Lower Higher Higher Z double bond (Higher-priority groups are on the same side.) Lower Lower 2004 Thomeson-BroSequence Rules: The E,Z Designation „ If the higher-priority groups on each carbon are on the same side of the double bond, the alkene is designated Z „ If the higher-priority groups on each carbon are on opposite sides of the double bond, the alkene is designated E