alkenes: content Flashcards
1
Q
why do stereoisomers form
A
No free rotation around C=C double (π) bonds
2
Q
what is a pi (π) bond and how are they formed
A
a type of covalent bond formed by the sideways overlap of p orbitals on adjacent atoms either side of a double bond
produces a region of high electron density above and below the molecule (and alongside the σ bond)
3
Q
when do you get E/Z isomerism
A
When there are two different groups/atoms attached to each carbon at the ends of the double bond
4
Q
how to identify E/Z isomers
A
use Cahn-Ingold-Prelog priority rules
