New cationic palladium(II) complexes, containing C-S-nitrogen chelate ligan
ds with pyrazol moieties, catalyze the copolymerization of styrene with CO
under mild conditions, to produce a syndiotactic copolymer. Molecular weigh
t and polydispersity for the obtained polymers are among the best reported
for bisnitrogen planar ligands. (C) 2001 Elsevier Science B.V. All rights r
eserved.