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- W2018915512 abstract "Three optically active phenylacetylene polymers with chiral bulky pinanyl groups, (−)-poly[4-(dimethylpinanylsilyl)phenylacetylene] [(−)-poly(PSPA)], (+)-poly{4-[3-(10-pinanyl)tetramethyldisiloxy]phenylacethylene} [(+)-poly(PDSPA)], and their copolymer [(−)-copoly(PSPA/PDSPA)], were synthesized. We observed high chirality in the main-chain chromophore of (−)-poly(PSPA), due to the presence of a chiral helix, with circular dichroism spectroscopy. In contrast, (+)-poly(PDSPA),with flexible SiOSi spacers between the chiral pinanyl group and the main chain, had lower chirality. (−)-Poly(PSPA), with large circular dichroism signals, was prepared by polymerization with a rhodium catalyst and had a highly stereoregular main chain (high cis-configuration percentage). However, (−)-poly(PSPA) prepared with a tungsten catalyst had lower chirality and lower stereoregularity in the main chain. A membrane from (−)-poly(PSPA) showed enantioselective permeability for tryptophan in an aqueous solution. © 2002 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 40: 1689–1697, 2002" @default.
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- W2018915512 date "2002-04-23" @default.
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- W2018915512 title "Helical chirality of ?-conjugated main-chain induced by polymerization of phenylacetylene with chiral bulky pinanyl groups: Effects of the flexible spacer and polymerization catalyst" @default.
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- W2018915512 doi "https://doi.org/10.1002/pola.10253" @default.
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