Question #16b44
1 Answer
The order is
Explanation:
The Cahn-Ingold-Prelog order is based on the atomic numbers of the atoms attached to the chiral centre.
If there is a tie, we go one atom further out and keep going until the tie is broken.
In this problem, the atoms attached to the chiral centre are all carbon atoms, for
a 4-way tie.
To break the tie, we look at the atoms that are directly attached to these carbons.
First trial
Each carbon in the double bond counts as two carbons.
So,
We now compare the atoms in parentheses and look at the first point of difference.
We find tert-butyl (
So, tert-butyl is Priority 1 and ethyl is Priority 4, but vinyl and isopropyl are tied in the middle.
Second trial
To break the tie, we look at the atoms directly attached to
So the vinyl group wins and gets Priority 2, and the isopropyl group is Priority 3.
The order is