Abstract
Asymmetric anionic polymerizations of chiral (R)-(+)-N-α-methylbenzylmaleimide (MBZMI) were performed with (-)-sparteine (Sp) or (S, S)-(1-ethylpropylidene)bis(4-benzyl-2-oxazoline) (Bnbox)/organometal complexes in toluene or tetrahydrofuran (THF). All polymers obtained were optically active. Specific optical rotations ([α]43525) of the polymers initiated by Et2Zn/Sp and Et2Zn/Bnbox were −113.5° to −195.7° and +56.0° to +170.2°, respectively. Number-average molecular weights (M̅n) of the polymers were from 7.2×103 to 2.9×104. Chirality of the polymers was attributed not only to chirality of optically active MBZMI units but also to stereogenic centers (S, S) and (R, R), in the main chain induced by the polymerization, judging from the results of circular dichroism (CD), 1H and 13C NMR spectra, and GPC curves obtained with polarimetric and UV detectors. Anionic polymerizability of MBZMI using organometal with and without chiral ligand. and chiroptical properties of the polymers are discussed.
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Zhou, H., Onimura, K., Tsutsumi, H. et al. Asymmetric Anionic Polymerization of Chiral (R)-(+)-N-α-Methylbenzylmaleimide with Chiral Ligand/Organometal Complex. Polym J 32, 552–559 (2000). https://doi.org/10.1295/polymj.32.552
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DOI: https://doi.org/10.1295/polymj.32.552
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