Reference of 1-(tert-Butyl)-1H-pyrrole-2,5-dione. The protonation of heteroatoms in aromatic heterocycles can be divided into two categories: lone pairs of electrons are in the aromatic ring conjugated system; and lone pairs of electrons do not participate. Compound: 1-(tert-Butyl)-1H-pyrrole-2,5-dione, is researched, Molecular C8H11NO2, CAS is 4144-22-3, about Asymmetric Anionic Polymerization of N-Substituted Maleimides with n-Butyllithium-Methylene-Bridged 2,2-Bis(oxazoline) Complexes. Author is Onimura, Kenjiro; Tsutsumi, Hiromori; Oishi, Tsutomu.
Asym. anionic homopolymerizations of achiral N-substituted maleimide [RMI: R = cyclohexyl (CHMI), R = Ph (PhMI), R = tert-Bu (TBMI)] were carried out with n-butyllithium (n-BuLi)-chiral bis(oxazoline) complexes to obtain optically active polymers. (-)-2,2′-(1-Ethylpropylidene)bis(4-alkyl-2-oxazoline) derivatives [4-alkyl(R’): R’ = benzyl ((S,S)-Bnbox), R’ = iso-Bu ((S,S)-i-Bubox), R’ = iso-Pr ((S,S)-i-Prbox), and R’ = Ph ((R,R)-Phbox)] were prepared from amino alcs. and diethylmalonic acid. The polymer initiated by n-BuLi-(S,S)-Bnbox showed the highest sp. rotation [poly(CHMI), [α]43525 +111.4°]. The poly(PhMI) prepared with (S,S)-i-Prbox as chiral ligand showed a neg. sp. rotation (-19.1°). The poly(TBMI) initiated by n-BuLi-(R,R)-Phbox showed a large sp. rotation (-63.2°). The sp. rotations were attributed to different contents between stereogenic centers (S,S) and (R,R) based on threo-diisotactic structures of the main chain.
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