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- W4254702958 abstract "Abstract Rare‐earth metal complexes (Flu‐CH 2 ‐Py)Ln(CH 2 SiMe 3 ) 2 (THF) n (Ln=Sc( 1 ), Lu( 2 ), Tm( 3 ), Y( 4 ) and Gd( 5 )), upon the activation of [Ph 3 C][B(C 6 F 5 ) 4 ] and Al i Bu 3 , were employed to catalyze the polymerization of allene derivatives under mild conditions. The Gd, Y, Tm, Lu metal based precursors exhibited distinguished 2,3‐selectivity (>99.9 %) for phenylallene (PA) polymerization, whereas the smallest Sc metal based precursor showed a moderate 2,3‐selectivity. The activity increased with the central metal size following the trend of Gd( 5 )>Tm( 4 )>Y( 3 )>Lu( 2 )>Sc( 1 ). Moreover, Gd( 5 ) also realized the purely 2,3‐selective polymerizations of polar or nonpolar allene derivatives, para ‐methylphenylallene, para ‐flourophenylallene and para ‐methoxyphenylallene, regardless of electron‐donating or ‐withdrawing substituents. Owing to the highly regular backbones, these polymers (except PPA) were crystalline, thus being the first crystalline polymers based on allene derivatives." @default.
- W4254702958 created "2022-05-12" @default.
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- W4254702958 date "2017-10-11" @default.
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- W4254702958 title "Highly 2,3-Selective Polymerization of Phenylallene and Its Derivatives with Rare-Earth Metal Catalysts: From Amorphous to Crystalline Products" @default.
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- W4254702958 doi "https://doi.org/10.1002/ange.201707601" @default.
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