Answer
1 - Br
2 - C (Top right)
3 - C (Bottom right)
4 - C (Bottom left)
Work Step by Step
1. Identify the stereocenter.
2. List all atoms connected to the stereocenter, and rank them by the atomic number.
- Br, C, C, C
Ranked by atomic number:
- Br, C, C, C
3. As we can see, there are 3 equal atoms.
- Find the closest variation on the chains (Double bond, Substituent).
- The chain with the closer variation gets priority.
In this case:
Top right chain: Methyl on the first carbon.
Bottom left chain: No variations
Bottom right chain: No variations
The top right chain gets first priority.
- If there are no variations to compare, use the lenght of the chain, the bigger one gets priority.
- The bottom right chain is bigger, therefore it will get the second priority.
4. Put the numbers on the stereocenter atoms:
1 - Br
2 - C (Top right)
3 - C (Bottom right)
4 - C (Bottom left)
