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- W3015280490 abstract "Coordination polymerization of 1-phenyl-1,3-butadiene (1PB) has been carried out using diiminophosphinato lutetium complexes 1 and 2, pyridyl-methylene-fluorenyl complexes 3 (Sc 3a; Lu 3b; Y 3c) and 4 (Sc 4a; Lu 4b; Y 4c), β-diketiminato yttrium complex 5, bis(imino)aryl gadolinium complex 6, bis(phosphino)carbazolide yttrium complex 7, and bis(phosphinophenyl)amido yttrium complex 8. Complexes 1, 2, 3a,b, and 4a,b, under the activation of [Ph3C][B(C6F5)4] and AliBu3, show high activities as well as higher than 96.6% 3,4-regioselectivities, of which 1 and 2 are nonstereoselective, giving atactic 3,4-poly(1PB), while 3a,b and 4a,b exhibit distinguished syndioselectivities (≥95.3% rrrr). However, 3c and 4c are inactive. In addition, complexes 5–7 are also completely inert although they are highly active and cis-1,4-selective for isoprene polymerization. On the contrary, the analogous cis-1,4-selective complex 8 exhibits syndio- (≥96.1% rrrr) and 3,4-regio- (>99%) selectivity. Hydrogenation of a syndiotactic 3,4-poly(1PB) affords a syndiotactic poly(4-phenyl-1-butene) elastomer with a Tg of 17 °C. The cationic cyclization transfers a syndiotactic 3,4-poly(1PB) into a rigid cyclized polyolefin with a Tg as high as 327 °C. Density functional theory (DFT) simulations are employed to illustrate the mechanisms for the control of activity and stereoselectivity from thermodynamic and geometric viewpoints." @default.
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- W3015280490 date "2020-04-08" @default.
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- W3015280490 title "Syndioselective 3,4-Polymerization of 1-Phenyl-1,3-Butadiene by Rare-Earth Metal Catalysts" @default.
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- W3015280490 doi "https://doi.org/10.1021/acscatal.9b04590" @default.
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