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Modern synthetic methods have revolutionized polymer chemistry through the development of new and powerful strategies for the controlled synthesis of complex polymer architectures. 1-5 Many of these developments were spawned by new classes of transition metal catalysts for the synthesis of new polyolefin microstructures, 5 the design of highly efficient families of “living” polymerization strategies for the synthesis of block, graft, and star polymers, 6-12 controlled methods for the synthesis of dendritic macromolecules, 3, 13, 14 and, recently, strategies for the synthesis of cyclic polyolefins by a metathesis ring-expansion polymerization. 15 Catalysis has proven an enabling science for chemical synthesis, and the development of new classes of well-defined catalysts has proven the enabling science for catalysis. 16 Given the extraordinary pace of these developments and the rich reactivity patterns engendered by …