Ethylene polymerization catalysis by vanadium-based systems bearing sulfur-bridged calixarenes

Carl Redshaw, Lucy Clowes, David L. Hughes, Mark R. J. Elsegood, Takehiko Yamato

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34 Citations (Scopus)


Calixarenes bridged by thia (-S-), sulfinyl (-SO-), or sulfonyl (-SO2-) linkers have been employed as ancillary ligands in vanadium-based ethylene polymerization and in the ring-opening polymerization of e-caprolactone. For ethylene polymerization, all pro-catalysts [PPh4][VOCl2(R-calix[4]areneH2)] (R = p-tert-butylthia (-S-) (1), sulfinyl (-SO-) (2), sulfonyl (-SO2-) (3)) were highly active, with the system bearing the sulfonyl (-SO2-)-bridged calixarene displaying enhanced activity. The molecular structures of pro-catalysts 2 and 3 are reported. Pro-catalysts 1–3 were inactive for the ROP of e-caprolactone.
Original languageEnglish
Pages (from-to)5620–5624
Number of pages5
Issue number21
Early online date14 Oct 2011
Publication statusPublished - 14 Oct 2011

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