I am having some trouble figuring the mechanism of this reaction:
attempt 1: the most obvious thing to do is deprotonate the acid group. I tried using the carboxylate group to attack the alkene, leaving the molecule negatively charged and not really knowing what to do next!If this happened, water would certainly protonate it and then it wouldn't be unsaturated...so it can't be that simple.
attempt 2:using alkene to deprotonate acid, then there is a positive charge at (one of) the alkene carbons. Then I tried using hydroxide to add in an alcohol group but to no avail...
I truly am stumped! I have seen lactones made by halogenation of the alkene but never without...I guess this is a special case because it is cyclic.