Answer
(2Z)-2-fluoropent-2-ene
Work Step by Step
1. Name the compound by its substituents, parent, unsaturations and functional group:
** First identify the parental chain, and where you should start counting the carbons.
- Substituents: 2-fluoro;
- Parent: pent;
- Unsaturations: 2-en;
- Functional group: -e;
2. Identify the double bonds and stereocenters.
- 1 double bond on the second carbon.
- No stereocenters.
3. Identify their configurations:
The double bond has on the left:
- Fluoro (Top)
- Methyl (Bottom)
So the fluoro has higher priority.
On the right:
- Ethyl (Top)
- Hydrogen (Bottom)
So the ethyl has higher priority.
- Both ethyl and fluoro are on "top", therefore, this double bond is "(Z)".
4. Put all the parts together:
(2Z)-2-fluoropent-2-ene