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• W2579061584 endingPage "934" @default.
• W2579061584 startingPage "927" @default.
• W2579061584 abstract "The combined use of P(2-MeOC6H4)3 (L1) and TMEDA as ligands effectively prevents defect formation in palladium-catalyzed direct arylation polymerization (DArP) to give donor–acceptor type alternating copolymers (DA polymers) with diketopyrrolopyrrole (DPP) units. The reaction of 3,6-bis(5-bromo-2-thienyl)diketopyrrolopyrrole (1-Br) and 3,4-dicyanothiophene (2-H) in toluene at 100 °C for 6 h in the presence of only L1 afforded a notable amount of insoluble materials via branching and cross-linking; in addition, the soluble part (Mn = 3100) included a large quantity of homocoupling defects (12.5%). In contrast, in the presence of L1 and TMEDA, the formation of insoluble materials was completely suppressed, and homocoupling defects decreased to 1.6%. Furthermore, the molecular weight of poly(1-alt-2) remarkably increased (Mn = 24 500, 97% yield). The mixed ligand catalyst using L1 and TMEDA was also effective against DArP of 1-Br with thienopyrroledione (3-H) or 3,4-propylenedioxythiophene (4-H) to afford DA polymers with DPP units in high yields (poly(1-alt-3): Mn = 36 800, 100% yield; poly(1-alt-4): Mn = 19 000, 80% yield). Thermal and optical properties of the resulting polymers are reported." @default.
• W2579061584 created "2017-01-26" @default.
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• W2579061584 date "2017-01-20" @default.
• W2579061584 modified "2023-10-14" @default.
• W2579061584 title "Mixed-Ligand Approach to Palladium-Catalyzed Direct Arylation Polymerization: Highly Selective Synthesis of π-Conjugated Polymers with Diketopyrrolopyrrole Units" @default.
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• W2579061584 doi "https://doi.org/10.1021/acs.macromol.6b02679" @default.
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