Polymeric Reagents Offer a Range of Unique Advantages.Intramolecular Reactions, Such As the Cyclization of Peptides or Dieckmanncyclizations, Can Be Brought About By Attaching the Reactive Molecules Atremote Points Along a Polymer Chain. In Contrast, If the Reactive Molecules Areanchored In Close Proximity on a Polymeric Support Then Intermolecularreactions Occur, As Demonstrated For a Ketone Synthesis.