8.45 Terminal alkynes react with Br2 and water to yield bromo ketones . For example
Propose a mechanism for the reaction . to what reaction of alkenes is the process analogous?
8.46 A cumulene is a compound with three adjacent double bonds. Draw an orbital picture of a cumulene. What is the geometric relationship of the substituents on one end to the other end? What kind of isomerism is possible? Make a model to help see the answer.
8.47 Reaction of acetone with D3O yields hexadeuterioacetone . that is all the hydrogens in acetone are exchanged for deuterium. Review the mechanism of mercuric ion-catalyzed alkyne hydration, and then propose a mechanism for this deuterium incorporation