Steric and Electronic Effects in Ethene/Norbornene Copolymerization by Neutral Salicylaldiminato-Ligated Palladium(II) Catalysts

Autor:	Sukhendu Mandal, Frances Pong, Ayusman Sen
Rok vydání:	2014
Předmět:	Steric effects Chemistry Ligand Organic Chemistry chemistry.chemical_element Catalysis Inorganic Chemistry chemistry.chemical_compound Functional group Polymer chemistry Electronic effect Copolymer Physical and Theoretical Chemistry Norbornene Palladium
Zdroj:	Organometallics. 33:7044-7051
ISSN:	1520-6041 0276-7333
DOI:	10.1021/om500470t
Popis:	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.
Databáze:	OpenAIRE
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