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• W3141159929 endingPage "3190" @default.
• W3141159929 startingPage "3181" @default.
• W3141159929 abstract "Chemoselective polymerization of divinyl monomers is a promising strategy to access functional polymers via postpolymerization, which however, encounters a cross-linking problem. Herein, we report the coordination polymerization of polar divinyl styrenyl monomers 1-(allyloxy)-4-vinylbenzene (AOS), 1-(but-3-en-1-yloxy)-4-vinylbenzene (BOS), 1-(pent-4-en-1-yloxy)-4-vinylbenzene (POS), and 1-(hex-5-en-1-yloxy)-4-vinylbenzene (HOS) by employing the thiophene-fused cyclopentadienyl scandium bis(alkyl) complexes (2,5-Me2-3-Ph-6H-cyclopenta[b]thiophenyl)Sc(CH2SiMe3)2THF (1) and (2,4,5,6-Me4-4H-cyclopenta[b]thiophenyl)Sc(CH2SiMe3)2THF (2) and the pyridinyl methylene fluorenyl rare-earth metal complexes (Py-CH2-Flu)Sc(CH2SiMe3)2 (3) and (Py-CH2-Flu)Y(CH2SiMe3)2THF (4). Complexes 1 and 2 show high chemoselectivity for these polar divinyl styrenyl monomers across the styrenyl C═C bond but give atactic products. Catalysts 3 and 4 exhibit solitary chemoselectivity to give atactic poly(AOS) but syndiotactic poly(BOS), poly(POS), and poly(HOS). The copolymerization of the polar divinyl styrenyl monomers with ethylene (E) mediated by 3 exhibits chemoselectivity to afford POS/E and HOS/E copolymers but homopolymer poly(AOS). The reasons behind the (co)polymerization behaviors were investigated by DFT calculation." @default.
• W3141159929 created "2021-04-13" @default.
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• W3141159929 date "2021-03-26" @default.
• W3141159929 modified "2023-10-14" @default.
• W3141159929 title "Chemo- and Stereoselective Polymerization of Polar Divinyl Monomers by Rare-Earth Complexes" @default.
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• W3141159929 doi "https://doi.org/10.1021/acs.macromol.1c00009" @default.
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