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Helix‐induced asymmetric polymerization
Author(s) -
Yu Bin,
Ding MengXian,
Wang YueChuan,
Hu HuiZhen,
Wang FoSong
Publication year - 1992
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19920630121
Subject(s) - prepolymer , cationic polymerization , polymerization , circular dichroism , monomer , polymer chemistry , helix (gastropod) , materials science , chemistry , polymer , crystallography , organic chemistry , ecology , snail , polyurethane , biology
Asymmetric polymerization could be induced by an already formed optically active living prepolymer with one‐handed screw sense helix conformation. The usually formed anionic active centre on the prepolymer could be changed to cationic, radical and even of Ziegler‐Natta type. These living prepolymers with various kinds of active centre were all effective to induce a consequent asymmetric polymerization of a monomer which may be other than that in the prepolymer, to afford an optically active helical chain with the same screw sense as that of the prepolymer. Eight monomers have been used in the work. Optical rotation, circular dichroism and gelpermeation chromatography have been taken to prove the helix‐induced asymmetric polymerization.