Steric and electronic effects in ethene/norbornene copolymerization by neutral salicylaldiminato-ligated palladium(II) catalysts

Frances Y. Pong, Sukhendu Mandal, Ayusman Sen

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Three palladium(II) catalysts, ligated with naphthoxyimine ligands, were synthesized, structurally characterized, and used to copolymerize ethene with norbornene derivatives. Results show that modification of the functional group on the 8-carbon of the naphthol ligand can significantly influence polymer composition and structure. The three functional groups on the 8-carbon studied were -H (catalyst A), -OH (catalyst B), and -OCH3 (catalyst C). Of the three catalysts, A is the most active toward ethene/5-n-butyl-2-norbornene and ethene/5-n-hexyl-2-norbornene copolymerizations; the molecular weight of the copolymers produced by catalyst A is significantly higher than those produced by either B or C. Both A and B are also capable of producing appreciable amounts of ethene/tert-butyl 5-norbornene-2-carboxylate copolymers which contain over 30% of the functionalized norbornene. C, in contrast to both A and B, is incapable of copolymerizing functionalized norbornene and ethene.

Original languageEnglish (US)
Pages (from-to)7044-7051
Number of pages8
Issue number24
StatePublished - Dec 22 2014


All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry

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