Abstract
(S)- and (R)-1-methylpropargyl alcohols [(S)-1 and (R)-1] and their ester derivatives (S)- and (R)-1-methylpropargyl hexanoates [(S)-2 and (R)-2] were polymerized using (nbd)Rh+[η6-C6H5B-(C6H5)3] as catalyst to afford the corresponding substituted polyacetylenes with moderate molecular weights in good yields. The polymers possessed cis-stereoregular structures according to 1H NMR. Large optical rotations and clear CD signals demonstrated that these polymers took a helical structure with predominantly one-handed screw sense, stabilized by steric repulsion between the side chains containing chiral groups adjacent to the main chain.
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