Iodohexa-1,3,5-triyne (I) and hexa-1,3,5-triyne (II) spontaneously polymerise in aprotic solution to form a solid carbonaceous product which contains polyyne-like structures and multi-walled carbon nanotubes with outer diameter ca. 10-20 nm and length 100-200 nm.Carbon nanotubes are conventionally produced by hightemperature (T > 1000 °C) catalytic processes. Nanotubes and fullerenes can also be prepared, albeit in low yield, at room temperature by chemical defluorination of perfluorocyclopentene, perfluorodecalin and perfluoronaphthalene. 1 Kawase et al. 2 have shown that a totally defluorinated poly(tetrafluoroethylene) (PTFE) can be partly transformed into carbon nanotubes (10-50 nm diameter, 1 mm length) by irradiation with fast electrons (100 kV; 103 C cm 22 ) at 800 °C. The process assumes the presence of reactive polyyne, which is formed by electrochemical reductive defluorination of PTFE, 2 Scheme 1.
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