The Ziegler-Natta polymerization of 3-ethynylphenanthrene resulted in cis-cisoidal (red and insoluble) and cis-transoidal (red-brown and soluble) poly(3-ethynylphenanthrene) structures. Trans-cisoidal (brown and soluble) poly(3-ethynylphenanthrene) has been obtained using phosphine complexes or by a thermal initiation method. The cis-cisoidal and cis-transoidal structures thermally isomerize in the solid state (at about 240° and 220° respectively), leading to a soluble trans-cisoidal compound. © 1978.
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