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When activated with MAO, <jats:bold>1<\/jats:bold>\u2013<jats:bold>3<\/jats:bold> are highly active catalysts for the production of high molecular weight polynorbornene (e.g., 1.39\u2009\u00d7\u200910<jats:sup>7<\/jats:sup>\u2009g PNB mol Ni<jats:sup>\u22121<\/jats:sup>\u2009\u00b7\u2009h<jats:sup>\u22121<\/jats:sup>). The catalytic activity and polymer molecular weight increase markedly with the initial concentration of norbornene, but both parameters decrease with the reaction time. The characterisation of the polynorbornenes by NMR, GPC\/SEC, X\u2010ray diffraction, and DSC\/TGA leads to the assignment of a structure typical of a polynorbornene originated by a coordination vinyl addition mechanism.\n<jats:boxed-text content-type=\"graphic\" position=\"anchor\"><jats:graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" mimetype=\"image\/jpeg\" position=\"anchor\" specific-use=\"enlarged-web-image\" xlink:href=\"graphic\/mgra001.jpg\"><jats:alt-text>magnified image<\/jats:alt-text><\/jats:graphic><\/jats:boxed-text><\/jats:p>","DOI":"10.1002\/macp.201000612","type":"journal-article","created":{"date-parts":[[2011,1,3]],"date-time":"2011-01-03T15:45:33Z","timestamp":1294069533000},"page":"367-374","source":"Crossref","is-referenced-by-count":17,"title":["Polymerisation of Norbornene Catalysed by Highly Active Tetradentate Chelated \u03b1\u2010Diimine Nickel Complexes"],"prefix":"10.1002","volume":"212","author":[{"given":"Lidong","family":"Li","sequence":"first","affiliation":[]},{"given":"Pedro T.","family":"Gomes","sequence":"additional","affiliation":[]},{"given":"M. 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