Stereospecific polymerization of 1,3-butadiene catalyzed by iron (III) Salen complexes combined with exogenous electron donor

Pyridine-amido aluminum catalyst precursors for 1,3-butadiene transition-metal-free stereospecific polymerization

“…2,[8][9][10][11][12][13] Afterward, with the discovery of methylaluminoxane (MAO), various transition metal-based metallocene and non-metallocene catalysts with well-defined chemical structures have been investigated. Many complexes based on Ti, [14][15][16] Sc, [17][18][19][20] Y, [21][22][23] Cr, 24,25 V, [26][27][28] Co, 29,30 Fe, [31][32][33] etc. provide extremely high activity and stereospecificity when combined with MAO or boron compounds.…”

Balance of the steric hindrance and solubility of alkoxy ligands for ultrahigh-activity molybdenum-based butadiene coordination polymerization

“…[10][11][12] Metallocene catalysts have occupied a certain position in the polybutadiene market, 13,14 but in order to better control the polymer stereoregularity, people still devote a lot of effort to exploring Ziegler-Natta catalysts, including iron, cobalt, chromium, etc. [15][16][17] The Mo-based polybutadiene catalytic system has stable 1,2-stereoselectivity. It has been confirmed that changing the type and dosage of ligands or co-catalysts in the catalytic system fails to significantly change the polymer microstructure.…”

Fe‐based catalyst with diphenylphosphite as donor for stereopolymerization of butadiene, isoprene, and myrcene

“…These catalysts were very active in diene polymerizations under ambient temperature, providing binary cis-1,4/3,4, trans-1,4/3,4 polyisoprene, cis-1,4/1,2 (major) polybutadiene, as well as polymyrcene in some cases. [12][13][14][15] Over the past decades, there are significant progresses in stereoselective polymerization of butadiene promoted by iron, [16][17][18][19][20][21][22] cobalt, 23 chromium 24,25 and molydenium catalyts [26][27][28] with phosphine, phosphate or phosphite as an additive or ligand. Preceding this work, [16][17][18][19][20][21][22] we have reported phosphate and phosphite are efficient additives for iron catalyzed 1,2 stereopolymerization of butadiene.…”

“…[12][13][14][15] Over the past decades, there are significant progresses in stereoselective polymerization of butadiene promoted by iron, [16][17][18][19][20][21][22] cobalt, 23 chromium 24,25 and molydenium catalyts [26][27][28] with phosphine, phosphate or phosphite as an additive or ligand. Preceding this work, [16][17][18][19][20][21][22] we have reported phosphate and phosphite are efficient additives for iron catalyzed 1,2 stereopolymerization of butadiene. Notable syndiotactic selectivity and excellent activity are achieved at 100 C, significant improvement compared with typical ironbased catalyst.…”