In this problem I need to propose a good method to do these transformations:
I know there are some different ways, but I have to do it using sulphur chemistry.
For the first one, I thought of a alpha-halogenation, and then, Swern reaction (DMSO, heat) to give 1,2-diketone
Then use Julia olephination to give the alkene. I guess I'll need to protect one of the carbonyl (after alpha-halogenation and before Swern oxidation).
But I see this method kind of "overcomplicated", any other idea?
For the last one I'm gonna need some hints, because I see the possibility of epoxide opening and then elimination. But that does not involve sulphur compounds chemistry, which I need to use.
Thanks in advance