Structure and Preparation of Alkenes.
Functional group suffix = -ene (review)
Simple 1,2-alkenes can be described as cis- or trans- (review)
More complex alkenes are best described as E- or Z- based on the Cahn-Ingold-Prelog priority rules (review)
There are 3 factors that influence alkene stability:
1. Degree of substitution, i.e. how many alkyl groups are attached to the C=C ? More highly alkylated alkenes are more stable, so tetra > tri > di > mono-substituted.
2. Stereochemistry: trans > cis due to reduced steric interactions when R groups are on opposite sides of the double bond.
3. Conjugated alkenes are more stable than isolated alkenes.
|more stable than|
|© Dr. Ian Hunt, Department of Chemistry|