Abstract
Asymmetric polymerizations of achiral methacrylates such as bulky triphenylmethyl and diphenyl-2-pyridylmethyl esters were investigated in toluene at −78°C. t-Butyllithium complexed with a tetramethylethylenediamine derivative having an axially chiral 6.6′-dimethylbiphenyl-2.2′-diyl substituent (1) at −78°C was found to be a versatile chiral initiator for the above polymerizations. The produced poly(ester)s were easily soluble in THF, because of the limited molecular weights. The polymers of helical conformation showed large optical rotations, whose signs depended on the chirality of the used 1.
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Kanoh, S., Sumino, T., Kawaguchi, N. et al. New Chiral Catalyst, t-Butyllithium Complexed with Axially Chiral Diamine, for Asymmetric Polymerizations of Triphenylmethyl Methacrylate and Its 2-Pyridyl Derivative. Polym J 20, 539–547 (1988). https://doi.org/10.1295/polymj.20.539
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DOI: https://doi.org/10.1295/polymj.20.539