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These co\u2010catalysts were obtained through the reaction of acetic acid, benzoic acid, or benzoic acid derivatives with different trialkylaluminums. The most promising co\u2010catalyst was obtained from the reaction of benzene tricarboxylic acid (BTCA) with trimethylaluminum (TMA). The influence of alkylaluminum\/BTCA ratio, reaction time, and temperature on the ethylene polymerization activity was investigated. <jats:sup>1<\/jats:sup>H NMR spectra of some of the most active co\u2010catalysts confirm the formation of alumoxane\u2010type species.<\/jats:p><jats:p>Polymerization activities of the same order or even higher to those found using \u201cpure\u201d trialkylaluminums or methylaluminoxane (MAO) co\u2010catalysts were obtained.<\/jats:p><jats:p><jats:boxed-text content-type=\"graphic\" position=\"anchor\"><jats:graphic xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" mimetype=\"image\/gif\" position=\"anchor\" specific-use=\"enlarged-web-image\" xlink:href=\"graphic\/mgra001.gif\"><jats:alt-text>magnified image<\/jats:alt-text><\/jats:graphic><\/jats:boxed-text>\n<\/jats:p>","DOI":"10.1002\/macp.200600615","type":"journal-article","created":{"date-parts":[[2007,4,24]],"date-time":"2007-04-24T16:23:54Z","timestamp":1177431834000},"page":"815-822","source":"Crossref","is-referenced-by-count":5,"title":["Novel Organic Activators for Single Site Iron Catalysts"],"prefix":"10.1002","volume":"208","author":[{"given":"Joana","family":"Tudella","sequence":"first","affiliation":[]},{"given":"Maria Ros\u00e1rio","family":"Ribeiro","sequence":"additional","affiliation":[]},{"given":"Henri","family":"Cramail","sequence":"additional","affiliation":[]},{"given":"Alain","family":"Deffieux","sequence":"additional","affiliation":[]}],"member":"311","published-online":{"date-parts":[[2007,4,24]]},"reference":[{"key":"e_1_2_4_1_2","doi-asserted-by":"publisher","DOI":"10.1002\/1521-3927(20011001)22:14<1095::AID-MARC1095>3.0.CO;2-R"},{"key":"e_1_2_4_2_2","doi-asserted-by":"publisher","DOI":"10.1002\/anie.198003901"},{"key":"e_1_2_4_3_2","doi-asserted-by":"publisher","DOI":"10.1016\/S0065-3055(08)60307-X"},{"key":"e_1_2_4_4_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja00065a005"},{"key":"e_1_2_4_5_2","doi-asserted-by":"publisher","DOI":"10.1021\/om0106128"},{"key":"e_1_2_4_6_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja0372412"},{"key":"e_1_2_4_7_2","doi-asserted-by":"publisher","DOI":"10.1021\/ma012234o"},{"key":"e_1_2_4_8_2","doi-asserted-by":"publisher","DOI":"10.1021\/ma0345854"},{"key":"e_1_2_4_9_2","unstructured":"US 831109 (1998) Akzo Nobel invs.:G. 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