Premium
Regio‐ and stereocontrol in the alternating copolymerization of olefins with carbon monoxide
Author(s) -
Amevor Esther,
Bronco Simona,
Consiglio Giambattista,
Di Benedetto Silvia
Publication year - 1995
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19950890141
Subject(s) - copolymer , polymer chemistry , carbon monoxide , thioether , cationic polymerization , styrene , ligand (biochemistry) , olefin fiber , tacticity , steric effects , chemistry , materials science , catalysis , organic chemistry , polymerization , polymer , biochemistry , receptor
Abstract Strictly alternating copolymers between olefins and carbon monoxide are synthesized using cationic palladium catalysts modified by phosphorus or nitrogen ligands. Basic chelate diphosphines as the ligand allow the regioregular copolymerization of aliphatic olefins thus affording, e.g. in the case of propene, poly(1‐oxo‐2‐methyltrimethylene). Steric control of the copolymerization process towards the production of overwhelmingly isotactic copolymers is possible particularly when using atropisomeric ligands. In the case of styrene as the substrate and for all ligands employed the copolymerization process is regioregular. Prevailing syndiotactic structure is obtained with 1,10‐phenanthroline or 2,2′‐bipyridine as the ligand. Chelate thioether ligands allow the preparation of a completely atactic material. For 4‐ tert ‐butylstyrene an isotactic structure became accessible by using chiral bisoxazolidines. The prevailing structure of the copolymers of cyclopentene corresponds to a 1,3‐enchainment of the olefin units most probably associated with a prevailing diisotactic structure