source: Macromolecular Chemistry and Physics year: 2009 volume: 210 first page: 1891 last page: 1902 doi: 10.1002/macp.200900245
Abstract: The polymerization of (2-isopropoxyphenyl)acetylene was investigated using a wide range of well-defined ruthenium-alkylidene complexes and related olefin metathesis initiators. In view of its superior activity, the second generation Hoveyda-Grubbs catalyst was singled out for further studies. Only phenylacetylenes ortho-substituted with alkoxy, ester, fluoro, and silyl groups afforded polymers with moderate molecular weights. They were characterized by various analytical techniques, and their properties were compared with those of samples prepared using Rh and W initiators. The Ru-based polymers possessed high trans contents and took a helical conformation with predominantly one-handed screw sense when chiral side-chains were present.
Keywords: Conjugated Polymers, Helicity, Metathesis, Organometallic Catalysts, Polyacetylenes