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The polymers produced contain a <jats:italic>trans<\/jats:italic>\u2010fused five\u2010membered ring in each repeating unit. NMR spectroscopy and FAB mass spectrometry of the polymers formed indicated that the initiation end of the chain contains either the cyclopentyl group derived from the preformed Pd\u2013monomer complex or a hydrogen atom left on the Pd center by the chain\u2010transfer reaction. The stable cyclopentylpalladium species are involved in both initiation and propagation steps and undergo isomerization into (cyclopentylmethyl)palladium species followed by the insertion of a CH\uf8feCH<jats:sub>2<\/jats:sub> bond of a new monomer molecule into the Pd\uf8ffCH<jats:sub>2<\/jats:sub> bond. Copolymerization of 1,6\u2010heptadiene derivatives with ethylene, catalyzed by the Pd complexes, yields polymers that contain <jats:italic>trans<\/jats:italic> five\u2010membered rings and branched oligoethylene units. Copolymerization of isopropylidene diallylmalonate with 1\u2010hexene affords a polymer with 26\u2009% diene incorporation. The copolymerization consumes 1\u2010hexene more readily than isopropylidene diallylmalonate, although gel permeation chromatography and NMR spectroscopy of the polymers produced show the formation of copolymers rather than of a mixture of homopolymers. Polymerization of 1\u2010hexene initiated with a Pd\u2013barbiturate complex and terminated with 5\u2010allyl\u20105\u2010hexylpyrimidine\u20102,4,6(1<jats:italic>H<\/jats:italic>,3<jats:italic>H<\/jats:italic>,5<jats:italic>H<\/jats:italic>)\u2010trione\/Et<jats:sub>3<\/jats:sub>SiH leads to polyhexene with barbiturate moieties at both terminal ends. Addition of 5\u2010hexyl\u20102,4,6\u2010triaminopyrimidine to a toluene solution of the telechelic poly(1\u2010hexene) converts the solution into gel.<\/jats:p>","DOI":"10.1002\/chem.201000604","type":"journal-article","created":{"date-parts":[[2010,7,14]],"date-time":"2010-07-14T10:56:21Z","timestamp":1279104981000},"page":"8662-8678","source":"Crossref","is-referenced-by-count":48,"title":["Cyclopolymerization and Copolymerization of Functionalized 1,6\u2010Heptadienes Catalyzed by Pd Complexes: Mechanism and Application to Physical\u2010Gel 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