Uranium(iv) alkyl cations: synthesis, structures, comparison with thorium(iv) analogues, and the influence of arene-coordination on thermal stability and ethylene polymerization activity†‡ Nicholas R. Andreychuk,a Balamurugan Vidjayacoumar,a Jeffrey S. Price,a Sophie Kervazo,b Craig A. Peeples,c David J. H. Emslie, *a Valérie Vallet, *b André S. P. Gomes, b Florent Réal, b Georg Schreckenbach, *c Paul W. Ayers, *a Ignacio Vargas-Baca, a Hilary A. Jenkinsa and James F.
