9. Alkenes and Alkynes
Alkene Stability
26PRACTICE PROBLEM
In 1935, German chemist J. Bredt proposed that unless one of the rings had at least eight carbons, a bicycloalkene could not have a double bond at a bridgehead carbon. It is referred to as Bredt's rule. Describe why the double bond in the given compound is impossible.
![](https://lightcat-files.s3.amazonaws.com/problem_images/b9651f6c7caecc5d-1677600598970.jpg)
In 1935, German chemist J. Bredt proposed that unless one of the rings had at least eight carbons, a bicycloalkene could not have a double bond at a bridgehead carbon. It is referred to as Bredt's rule. Describe why the double bond in the given compound is impossible.