Summary
Dehalogenation polycondensation of 1,4-diiodo-1,3-cyclohexadiene with zerovalent nickel complex gives a new π-conjugated polymer, poly(1,3-cyclohexadiene-1,4-diyl) PCyh. A copolymer constituted of 1,3-cyclohexadiene-1,4-diyl and 1,4-cyclohexadiene-1,4-diyl is also obtained by a similar method. The black color of PCyh indicates the presence of extensive π-conjugation
along the polymer chain presumably due to takings-trans conformation of PCyh. PCyh is unstable and oxidized under air. IR and CP-MAS13C-NMR spectra of PCyh are reasonable for the structure.
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Yamamoto, T., Saito, H., Osakada, K. et al. Poly(1,3-cyclohexadiene-1,4-diyl). Polymer Bulletin 29, 597–603 (1992). https://doi.org/10.1007/BF01041143
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DOI: https://doi.org/10.1007/BF01041143