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- W2011302372 abstract "Abstract Summary: The performances of readily available Ln(allyl) 2 Cl(MgCl 2 ) 2 · (THF) 4 precursors (Ln = Nd, 1 ; Y, 2 ; La, 3 ), in combination with alkyl aluminum activators [MAO, AlMe 3 , AlEt 3 , Al( i Bu) 3 ], have been studied in isoprene polymerization. The catalyst combination 1 /MAO (1:30) shows a high activity (average TOFs up to ca. 5 × 10 4 mol (Ip) · mol (Nd) −1 · h −1 at 20 °C) and produces polyisoprene in a controlled fashion with up to 98.5% cis content, number‐average molecular weights in reasonable agreement with calculated values, and relatively narrow polydispersities index ( $overline M _{rm w} /overline M _{rm n}$ = 1.20–1.70). The yttrium precursor 2 affords systems with much lower activity and degree of control, but enables the formation of either 1,4‐ cis ‐enriched (75%) or 1,4‐ trans ‐enriched (91%) polyisoprenes, simply replacing the MAO activator by AlEt 3 or Al( i Bu) 3 , respectively. Formation of 1,4‐ cis ‐ or 1,4‐ trans ‐enriched polyisoprenes upon activation with MAO. magnified image Formation of 1,4‐ cis ‐ or 1,4‐ trans ‐enriched polyisoprenes upon activation with MAO." @default.
- W2011302372 created "2016-06-24" @default.
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- W2011302372 date "2006-02-16" @default.
- W2011302372 modified "2023-10-13" @default.
- W2011302372 title "Mixed Aluminum-Magnesium-Rare Earth Allyl Catalysts for Controlled Isoprene Polymerization: Modulation of Stereocontrol" @default.
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- W2011302372 doi "https://doi.org/10.1002/marc.200500775" @default.
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