Abstract
AbstractThe asymmetric anionic polymerization of o‐, m‐, and p‐methylphenyl isocyanates, p‐methoxyphenyl isocyanate, p‐chlorophenyl isocyanate, 2,6‐ and 3,4‐dimethylphenyl isocyanates, and 1‐naphthyl isocyanate was carried out using chiral anionic initiators such as the lithium salts of (−) ‐menthol, (−) ‐(2‐methoxymethyl) pyrrolidine, and (+) ‐1‐(2‐pyrrolidinylmethyl) pyrrolidine. Although o‐methylphenyl isocyanate gave an insoluble polymer and 2,6‐dimethylphenyl isocyanate afforded no polymer, the other monomers gave soluble polymers, which showed optical activity due to the prevailing helicity of the polymer chain induced by chiral initiator residues attached to the α‐end of the polymer chain. The molecular mechanics conformational calculation for a tetramer of m‐methylphenyl isocyanate supported the helical conformation of the main chain. The optical rotation of the polymers depended significantly on temperature. © 1994 John Wiley & Sons, Inc.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Journal of Polymer Science Part A: Polymer Chemistry
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
