So, I'm rather stuck on the following synthesis problem.
![](https://mywebspace.wisc.edu/srlee2/web/synthesis.GIF?uniq=c5bi68)
I know we're usually supposed to throw out some sort of idea ourselves, but I'm having a tough time even getting started. Is there any way to add a protecting group, but then instead of removing the protecting group, remove the other hydrocarbon?
Anyways, all I'm looking for is a push in the right direction. Thanks for the help.