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Asymmetric chain‐growth synthesis of polyisocyanide with chiral nickel precatalysts
Author(s) -
Schraff Sandra,
Kreienborg Nora M.,
Trampert Jens,
Sun Yu,
Orthaber Andreas,
Merten Christian,
Pammer Frank
Publication year - 2020
Publication title -
journal of polymer science
Language(s) - English
Resource type - Journals
eISSN - 2642-4169
pISSN - 2642-4150
DOI - 10.1002/pol.20200153
Subject(s) - circular dichroism , polymerization , nickel , enantiomer , chemistry , aryl , enantiomeric excess , phosphine , polymer chemistry , polymer , catalysis , enantioselective synthesis , crystallography , stereochemistry , organic chemistry , alkyl
Nickel(II)‐aryl complexes [(L 2 )Ni(Ar)Br] bearing either chiral phosphine ligands (L 2 = RR ‐ or SS ‐DIPAMP, Ar = ortho ‐anisyl), or a chiral aryl‐group have been prepared, and their structural optical an chiroptical properties have been characterized. Enantiomeric pairs of both catalysts have been used for the asymmetric polymerization of different isocyanides ( M1 , M2 , M3 ), to give well defined polyisocyanides ( P1 , P2 , P3 ). Their polymerization behavior has been studied, which confirmed chain‐growth polymerization in all cases. The asymmetric induction has been verified by circular dichroism spectroscopy on enantiomeric pairs of all three polymers.