in neat (no solvent) heating in Ar at 220 °C; detected by powder X-ray diffractometry;

in neat (no solvent) in air, heating at 180 °C, CuCl, 2-chloropyrazine and some CuO were formed, Cu2OCl2 was formed at 392 °C, CuCl was formed again at430 °,C and CuO was formed in the last step at 461 °C; detected by X-ray powder diffractometry;