Pd-catalyzed asymmetric alternating co-polymerization of propene with carbon monoxide using ionic liquids |
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Institution: | 1. ENSCM – AM2N, UMR 5253 – Institut Charles Gerhardt, Montpellier Cedex, France;2. PSL Research University, Chimie ParisTech – CNRS, Institut de Recherche de Chimie Paris, Paris, France |
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Abstract: | A protocol for Pd-catalyzed stereoselective co-polymerization of propene and carbon monoxide using chiral ligands, such as (2S,3S)-DIOP and (R)-P-Phos in C4mim]PF6]/C6mim]PF6] as an ionic liquid medium was developed. With (2S,3S)-DIOP as chiral ligand and C4mim]PF6] as medium, the Pd-catalyzed co-polymerization of propene and CO gave almost completely regioregular polyketones, and the product polymer showed moderate stereoregularity (61% of ?-diads). The highest molar optical rotation = +15.9 and polydispersity = 1.2 were attained when (R)-P-Phos was used as the ligand and C6mim]PF6 as the solvent. The co-polymer exhibited regioregularity of H–H/H–T/T–T (%) = 17:66:17. |
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