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The more complex stereochemistry of highly substituted alkenes (especially 3 or 4 substituents) cannot be defined using the cis-trans notation. For this purpose a new notation known as E-Z notation is used. Following a set of defined rules (Cahn-Ingold-Prelog priority rule), each substituent on a double bond is assigned a priority.
Additional recommended knowledge
If the two groups of higher priority are on opposite sides of the double bond, the bond is assigned the configuration E, (from entgegen, the German word for "opposite").
If the two groups of higher priority are on the same side of the double bond, the bond is assigned the configuration Z, (from zusammen, the German word for "together").
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "E-Z_notation". A list of authors is available in Wikipedia.