closes the ring and creates a cycloalkene. Intramolecular McMurry Reactions When two carbonyl groups are coupled and undergo a McMurry reaction, there is a possibility of the formation of cycloalkenes under specific conditions. When both carbonyls are within the same molecule and not sufficiently separated from each other, a cycloalkene can be formed through an intramolecular McMurry reaction. See also Perfluorocycloalkene (PFCA) Alicyclic compound Olefin Cycloalkyne Cycloalkane References