Stereoselectivity and chemoselectivity in Ziegler–Natta polymerization of conjugated dienes. 2. Mechanism for 1,2 syndiotactic polymerization of diene monomers with high energy s-cis η4 coordination

Stereoselectivity and chemoselectivity in Ziegler–Natta polymerization of conjugated dienes. 2. Mechanism for 1,2 syndiotactic polymerization of diene monomers with high energy s-cis η4 coordination