Summary
Cyclopolymerization of amino acid-derived novel dipropargyl ester and dipropargylamide was carried out using a rhodium catalyst. Polymers with cyclized structures were obtained under certain conditions. The dipropargylamide polymer exhibited a large specific rotation and an intense Cotton effect around 300 nm based on the chiral higher order structure. It adsorbed N-benzyloxycarbonyl-L-alanine more than the D-isomer, and extracted Li+, Na+, K+, and Cs+ from water phase into CH2Cl2 phase.
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We carefully checked the 1H NMR spectra of the polymers, but we could not obtain information on the reverse addition of the acetylenic group.
Separation factors are not listed in the present study, because the adsorption experiment was carried out using the L- and D-adsorbates separately.
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Sanda, F., Kawano, T. & Masuda, T. Cyclopolymerization of Amino Acid-Based Diynes and Properties of the Obtained Polymers. Chiral Recognition and Metal Ion Extraction. Polym. Bull. 55, 341–347 (2005). https://doi.org/10.1007/s00289-005-0445-7
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DOI: https://doi.org/10.1007/s00289-005-0445-7