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The polymerization of conjugated dialkenes to isotactic and syndiotactic polymers. Effect of ligands on the stereospecificity

1991; Wiley; Volume: 48-49; Issue: 1 Linguagem: Inglês

10.1002/masy.19910480120

0258-0322

Lido Porri, Antonino Giarrusso, Giovanni Ricci,

Catalysis and Oxidation Reactions

Abstract On the basis of the results obtained with various substituted dialkenes, including deuterated monomers, an interpretation is presented of the mechanism of formation of the following polymers: 1,2 iso‐ and syndiotactic polybutadiene; cis‐1,4 iso‐ and syndiotactic polypentadiene; 1,2 syndiotactic poly(5‐methyl‐1,3‐pentadiene); trans‐1,4 threo diisotactic poly(2,4‐hexadiene). Evidence is given that the ligands bonded to the transition metal of the catalyst are important in determining the orientation of the incoming monomer.