The interaction of CC14, CH2Cl2, and CCl2=CCl2 with Li in THF gives rise to polymers containing conjugated systems which include acetylenic, ethylenic, and possibly cumulene-type bonds.
The influence of various factors on the yield and composition of the polymers has been examined. Conditions have been found in which the polymer produced consists almost exclusively of carbon only.
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Kryazhev, Y., Petrinska, V. & Romanova, L.M. Dechlorination and dehydrochlorination of polychlorinated hydrocarbons. Synthesis of conjugated-system polymers. Russ Chem Bull 18, 1490–1492 (1969). https://doi.org/10.1007/BF00908760