What is the mechanism of this reaction? After performing $\ce{E1}$ thrice I was expecting 1,2,3-trimethylidenecyclopropane to be formed instead.
I know it's highly strained but I couldn't adopt any other pathway to reach any other product.
Is the triene product not formed at all? If cyclopropane-1,2,3-trione can exist I think even the triene product can.
This reaction is from my exercise book, couldn't find it on orgsyn.org.