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Examination of the molecular structure revealed alkynyl group migration from Zr to Ti, as confirmed by single\u2010crystal x\u2010ray analysis, nuclear magnetic resonance spectroscopy, and quantum chemical calculations. The homodinuclear (Zr\/Zr) and heterodinuclear (Ti\/Zr) complexes were activated with [Ph\n                    <jats:sub>3<\/jats:sub>\n                    C][B(C\n                    <jats:sub>6<\/jats:sub>\n                    F\n                    <jats:sub>5<\/jats:sub>\n                    )\n                    <jats:sub>4<\/jats:sub>\n                    ], B(C\n                    <jats:sub>6<\/jats:sub>\n                    F\n                    <jats:sub>5<\/jats:sub>\n                    )\n                    <jats:sub>3<\/jats:sub>\n                    , and a mixture of B(C\n                    <jats:sub>6<\/jats:sub>\n                    F\n                    <jats:sub>5<\/jats:sub>\n                    )\n                    <jats:sub>3<\/jats:sub>\n                    with excess Et\n                    <jats:sub>3<\/jats:sub>\n                    SiH (SiHB system) as aluminium\u2010free activators and tested in ethylene polymerization. Depending on the type of activator, unique reactivity was observed, resulting in either electron or methyl abstraction and the formation of cationic species. The catalytically active species are proposed to have dinuclear character, forming linear polyethylenes with unsaturated groups predominantly on the Zr cationic center. In contrast, the Ti cationic center generated by a SiHB system only in dichloromethane produced silicon\u2010terminated polyethylenes.\n                  <\/jats:p>","DOI":"10.1002\/chem.71125","type":"journal-article","created":{"date-parts":[[2026,5,22]],"date-time":"2026-05-22T06:45:42Z","timestamp":1779432342000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Dinuclear Group 4 Metallocene Catalysts of the Type [(Cp\n                    <sub>2<\/sub>\n                    M)\n                    <sub>2<\/sub>\n                    (\n                    <i>\u03bc<\/i>\n                    \u2010Me)(\n                    <i>\u03bc<\/i>\n                    \u2010C\n                    <sub>2<\/sub>\n                    R)]: Structure\u2010Activity Relationships in Ethylene Polymerization"],"prefix":"10.1002","volume":"32","author":[{"given":"Hanan Al","family":"Hamwi","sequence":"first","affiliation":[{"name":"Leibniz Institute for Catalysis  Rostock Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mirko","family":"Rippke","sequence":"additional","affiliation":[{"name":"Leibniz Institute for Catalysis  Rostock Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anke","family":"Spannenberg","sequence":"additional","affiliation":[{"name":"Leibniz Institute for Catalysis  Rostock Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3203-3080","authenticated-orcid":false,"given":"Michal","family":"Hor\u00e1\u010dek","sequence":"additional","affiliation":[{"name":"J. Heyrovsky Institute of Physical Chemistry of the Czech Academy of Sciences  Prague Czech Republic"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3478-0802","authenticated-orcid":false,"given":"Ji\u0159\u00ed","family":"Pinkas","sequence":"additional","affiliation":[{"name":"J. Heyrovsky Institute of Physical Chemistry of the Czech Academy of Sciences  Prague Czech Republic"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Vojt\u011bch","family":"Varga","sequence":"additional","affiliation":[{"name":"J. Heyrovsky Institute of Physical Chemistry of the Czech Academy of Sciences  Prague Czech Republic"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9499-9526","authenticated-orcid":false,"given":"Martin","family":"Lama\u010d","sequence":"additional","affiliation":[{"name":"J. 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