C2-Symmetric Zirconocenes in the Polymerization of Conjugated Diolefins

Highly Isotactic Poly(N-butenyl-carbazole): Synthesis, Characterization, and Optical Properties

“…Polymerization of monomer was performed at 20 ∘ C in toluene solution by using the rac-[(CH 3 ) 2 Si(indenyl) 2 ]ZrCl 2 / methylallumoxane (MAO) catalytic system (see Scheme 1). The catalytic precursor rac-[(CH 3 ) 2 Si(indenyl) 2 ]ZrCl 2 , activated by MAO, is well known to promote the isospecific polymerization of -olefins [15,22,23]. Recently, its high performances in the isospecific 9-(pent-4-en-1-yl)-9H-carbazole polymerization was also reported [19,20].…”

Ethylene/1,3-butadiene cyclocopolymerization catalyzed by zirconocene systems

“…Taking into account that for zirconocene catalysts 1,3-butadiene frequently behaves as a catalytic poison due to the easy formation of relatively stable zirconocene -g 3 -allyl complexes [47], this finding was expected.…”

Binary copolymerization of 4-methyl-1,3-pentadiene with styrene, butadiene and isoprene catalysed by a titanium [OSSO]-type catalyst

“…In this scenario, the monomer 4‐methyl‐1,3‐pentadiene (4MPD) is potentially interesting in the synthesis of polymers having pendant double bonds along the polymer chain because of the tendency of this 1,3‐alkadiene to polymerize giving prevalently 1,2‐enchainment, leaving one double bond unreacted . Indeed, many homogeneous catalytic systems based on group 4 metals activated by methylaluminoxane (MAO) have been shown to promote the 1,2‐syndioselective polymerization of 4MPD with good activity. In contrast, the solely homogeneous systems able to produce isotactic 1,2‐poly‐4MPD are based on titanium complexes incorporating [OSSO]‐type bis(phenolato) ligands .…”