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.
All Science Journal Classification (ASJC) codes
- Physical and Theoretical Chemistry
- Organic Chemistry
- Inorganic Chemistry