Ethylene polymerization catalysis by vanadium-based systems bearing sulfur-bridged calixarenes
Organometallics, ISSN: 0276-7333, Vol: 30, Issue: 21, Page: 5620-5624
2011
- 35Citations
- 14Captures
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Article Description
Calixarenes bridged by thia (?S?), sulfinyl (?SO?), or sulfonyl (?SO -) linkers have been employed as ancillary ligands in vanadium-based ethylene polymerization and in the ring-opening polymerization of ε-caprolactone. For ethylene polymerization, all pro-catalysts [PPh ][VOCl(R-calix[4]areneH)] (R = p-tert-butylthia (?S?) (1), sulfinyl (?SO?) (2), sulfonyl (?SO?) (3)) were highly active, with the system bearing the sulfonyl (?SO ?)-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 ε-caprolactone. © 2011 American Chemical Society.
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