Octachlorostyrene has been recovered from the reaction tube, along with previously reported hexachlorobenzene, during the synthesis of CrCl3 from Cr2O3 and CCl4 at high temperature. The region in the reaction tube where the octachlorostyrene was found, namely upstream from the Cr2O3 held at 890degreesC, suggests that this molecule is formed at a temperature below 890degreesC and that it decomposes if raised to that temperature. A low gas flow was used in this experiment, allowing products to diffuse countercurrently.