Catalysis direction selective asymmetric polymerization in chiral liquid crystal medium
作者： Tomokazu Iseki , Kohsuke Kawabata , Hirotsugu Kawashima , Hiromasa Goto
DOI: 10.1016/J.POLYMER.2013.12.009
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摘要: Abstract A series of optically inactive aryl isocyanide derivatives were polymerized with an achiral nickel catalyst (Ni(II)Cl2) in a cholesteric liquid crystal (CLC) medium. The polymers synthesized from ortho-substituted phenyl monomers CLC phase show optical activity even though they have no chiral carbons. Cotton effects these suggest that main chains the formed predominantly one-handed helical conformation. One-handed environment reaction state provided by medium allows formation polymers. sense is controllable choice (R)- or (S)-CLC as solvent, monomer same.
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