Suggest a reasonable mechanism for one of the following reactions:

SOLUTION:



The first stage consists of the opening of the oxacyclopropane on the least substituted carbon. In the second stage, the transfer of the oxygen pair eliminates the chlorine, forming a carbonyl.



In the first step there are two possible attack positions; carbonyl carbon and chlorine carbon. Since the final product has no methoxide on the chlorine carbon, we attack the carbonyl. In the second stage, an intramolecular nucleophilic substitution occurs. To finish the methoxide open the epoxide.