Controlled polymerization of isoprene promoted by a type of hemilabile XPN 3 (X = O, S) ligand supported cobalt( ii ) complexes: the role of a hemilabile donor on the level of control

Cobalt dichloride complexes ( Co1–Co9 ) carrying a novel type of hemilabile donor PN 3 ( L1–L3 ) or XPN 3 ( L4–L6 , X = O; L7–L9 , X = S) are reported as precursors for controlled polymerization of isoprene.