Open AccessAsymmetric anionic polymerization of maleimides bearing bulky substituents
Author(s) -
Oishi Tsutomu,
Onimura Kenjiro,
Isobe Yukio,
Yanagihara Hiroaki,
Tsutsumi Hiromori
Publication year - 2000
Publication title -
journal of polymer science part a: polymer chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.768
H-Index - 152
eISSN - 1099-0518
pISSN - 0887-624X
DOI - 10.1002/(sici)1099-0518(20000115)38:2<310::aid-pola5>3.0.co;2-p
Subject(s) - maleimide , chemistry , anionic addition polymerization , butyllithium , stereocenter , polymer chemistry , sparteine , polymerization , diethylzinc , polymer , stereochemistry , organic chemistry , enantioselective synthesis , catalysis
Asymmetric anionic homopolymerizations of N ‐substituted maleimide (RMI) bearing bulky substituents [ R = benzyl, diphenylmethyl (DPhMI), 9‐fluorenyl (9‐FlMI), triphenylmethyl, (diphenylmethyloxycarbonyl)methyl, (9‐fluorenyloxycarbonyl)methyl] were carried out with complexes of organometal compounds (alkyllithium, diethylzinc) with six chiral ligands to obtain optically active polymers. The chiroptical properties of the polymers were affected strongly by the substituents on nitrogen in the maleimide ring, the organometal and chiral ligands. Poly(DPhMI) initiated by an n ‐butyllithium/(−)‐sparteine (Sp) complex showed a positive specific rotation ([α] 25 435+60.3°). Poly(9‐FlMI) prepared with a florenyllithium/Sp complex exhibited the highest specific rotation (+65.7°). The specific rotations of the poly(RMI) obtained were attributed to different contents between the stereogenic centers ( S , S ) and ( R , R ) based on threo ‐diisotactic structures of the main chain. © 2000 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 38: 310–320, 2000