Asymmetric polymerization of N-substituted maleimides with organolithium — bisoxazolines complex |
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Authors: | Kenjiro Onimura Hiromori Tsutsumi Tsutomu Oishi |
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Affiliation: | (1) Department of Applied Chemistry & Chemical Engineering, Faculty of Engineering, Yamaguchi University, 2557 Tokiwadai, Ube, Yamaguchi 755, Japan, JP |
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Abstract: | Asymmetric anionic polymerizations of achiral N-substituted maleimide (RMI) (N-cyclohexyl (CHMI), N-phenyl (PhMI), N-tert-butyl (TBMI)) by n-butyllithium (n-BuLi) or fluorenyllithium (FlLi) complexes of chiral bisoxazoline derivatives in toluene gave optically active polymers (α]25
435− 2.9° to − 8.2°). The polymers prerared with initiator of n-BuLi – 2,2′-bis(4,4′-isopropyl-,3-oxazoline) showed negative specific rotations (poly(RMI), α]25
435− 5.8° to − 8.2°) which were greater than those (α]25
435− 2.9° to − 5.9°) with other chiral 2,2′-bis(4,4′-alkyl-1,3-oxazoline) (alkyl group = iso-butyl and benzyl).
Received: 29 July 1997/Revised: 27 August 1997/Accepted: 1 September 1997 |
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